US Pat. No. 9,170,271

ACCELEROMETER AND ITS FABRICATION TECHNIQUE

Chinese Academy of Scienc...

1. An accelerometer, comprising:
a support frame;
a first mass symmetrically disposed relative to and within the support frame;
a plurality of resilient beams symmetrically disposed within the support frame relative to the first mass, each resilient
beam positioned between the first mass and the support frame and adjacent a different portion of the first mass, each resilient
beam having an E-shape structure with a middle beam and two end beams, each middle beam is connected to the first mass; and

a plurality of range-of-motion stops symmetrically disposed within the support frame relative to the first mass, each range-of-motion
stop positioned adjacent to and connected to the end beams of two different resilient beams, each range-of-motion stop connected
to the first mass by a connection beam.

US Pat. No. 9,829,504

TRI-AXIAL MEMS ACCELEROMETER

Chinese Academy of Scienc...

1. A tri-axial MEMS accelerometer, comprising:
a top level structure and a bottom level structure, each structure including:
an outer frame;
an inner frame enclosed within the outer frame;
a mass coupled with the inner frame; and
a comb electrode structure between the mass and the inner frame;
wherein, on a projection plane, the orientation of the comb electrode structure on the top level structure is orthogonal to
the orientation of the corresponding comb electrode structure on the bottom level structure;

wherein the inner frame is coupled with the outer frame by a plurality of first elastic beams, and the inner frame is coupled
to the mass by a plurality of second elastic beams;

a top cap silicon wafer bonded with the top level structure; and
a bottom cap silicon wafer bonded with the bottom level structure;
wherein, the top level structure and the bottom level structure allow measurement of acceleration in respective perpendicular
directions as a change in capacitance between the mass and the inner frame for each level; and

wherein the mass of the top level structure, the mass of the bottom level structure, and the respective inner frames move
together along a third direction, wherein the acceleration in the third direction can be determined by measuring the change
in capacitance between the masses of the top and bottom level structures and respective inner frames as a unit, and the top
and bottom cap silicon wafers.

US Pat. No. 9,476,903

ACCELEROMETER AND ITS FABRICATION TECHNIQUE

Chinese Academy of Scienc...

1. An accelerometer, comprising:
a measurement mass;
a top cap silicon wafer and a bottom cap silicon wafer, both coupled with the measurement mass;
wherein the measurement mass includes a support frame, a mass, and a plurality of resilient beams, the measurement mass has
a double-sided silicon on insulator structure, which includes a top silicon layer, a middle silicon layer, and a bottom silicon
layer, with a silicon dioxide layer provided between the top and middle silicon layers and between the bottom and middle silicon
layers, the resilient beams are symmetrically formed in the top silicon layer and the bottom silicon layer to thereby form
a double layer structure;

wherein the mass and the resilient beams are located within the support frame, characterized in that the mass and the support
frame are connected by a plurality of sets of the resilient beams, wherein each set comprises two resilient folding beams
provided symmetrically with respect to a midline of the mass; and

a plurality of connection beams, each connection beam coupling each set of the resilient folding beams together.

US Pat. No. 10,030,504

RECEIVING APPARATUS SUITABLE FOR AZIMUTHALLY ACOUSTIC LOGGING WHILE DRILLING

INSTITUTE OF GEOLOGY AND ...

1. A receiving apparatus for azimuthally acoustic LWD, comprising: a drill collar body, a circuit mounting frame, a borehole diameter measurement system, and an azimuthally acoustic while drilling receiving system,wherein the circuit mounting frame is located inside the drill collar body,
wherein the azimuthally acoustic while drilling receiving system comprises a receiving transducer, a sealing connector, a preposed processing circuit module, and a first received signal processing circuit for processing a signal from the transducer, wherein the receiving transducer is electrically connected with the preposed processing circuit module through the sealing connector, and the preposed processing circuit module and the first received signal processing circuit are electrically connected,
wherein the borehole diameter measurement system comprises distance detecting sensors, at least one set of plugging assemblies, an electrical connector, and a second received signal processing circuit for processing signals from the distance detecting sensors, wherein the distance detecting sensors are connected with the electrical connector through the at least one set of plugging assemblies, and the electrical connector and the second received signal processing circuit are electrically connected,
wherein two ends of the circuit mounting frame are connected with the drill collar body by a MWD adapter and a tail locking structure, respectively,
wherein the receiving transducer, the sealing connector, the preposed processing circuit module, the distance detecting sensors, the at least one set of plugging assemblies and the electrical connector are mounted on the drill collar body in a high-pressure sealing manner,
wherein the first received signal processing circuit and the second received signal processing circuit are respectively mounted on the circuit mounting frame, and
the preposed processing circuit module comprises a signal amplifying module and an analog-to-digital conversion module.

US Pat. No. 9,828,242

ACCELEROMETER AND ITS FABRICATION TECHNIQUE

Chinese Academy of Scienc...

1. A method for fabricating an accelerometer, comprising:
(i) forming, by use of photolithography, deep etching and etching, a plurality of holes penetrating from a top silicon layer
and a bottom silicon layer to a middle silicon layer of a double-sided silicon on insulator (SOI) silicon wafer;

(ii) depositing polycrystalline silicon in the holes to fill up the holes, then growing a silicon dioxide layer on surfaces
of the top silicon layer and bottom silicon layer of the double-sided SOI silicon wafer;

(iii) forming, by use of photolithography, deep etching and etching, a plurality of sets of symmetrical resilient folding
beams and a plurality of connection beams for connecting the resilient folding beams, in the top silicon layer and the bottom
silicon layer of the double-sided SOI silicon wafer; then growing, by use of thermal oxidation, silicon dioxide on exposed
surfaces of the resilient folding beams and the connection beams, or depositing, by use of chemical vapor deposition (CVD),
a layer of silicon dioxide on exposed surfaces of the resilient folding beams and the connection beams;

(iv) removing, by use of photolithography and etching, the exposed silicon dioxide in the middle silicon layer, and deep etching
the middle silicon layer to a certain depth;

(v) corroding the middle silicon layer located between a support frame and a mass in order to form free-moving resilient beams
and connection beams;

(vi) removing by etching the exposed silicon dioxide; and
(vii) bonding together in one-step the top cap silicon wafer, the processed double-sided SOI silicon wafer, and the bottom
cap silicon wafer.

US Pat. No. 9,970,288

RECEIVING APPARATUS FOR DOWNHOLE NEAR-BIT WIRELESS TRANSMISSION

INSTITUTE OF GEOLOGY AND ...

1. A receiving apparatus for downhole near-bit wireless transmission, comprising a drill collar, a short tube disposed inside the drill collar, a drill collar insulating sub, an inner tube insulating sub, and a wireless transmission receiving unit, wherein the insulating subs electrically isolate the drill collar and the short tube from each other and to divide the receiving apparatus into a receiving positive pole and a receiving negative pole that are electrically isolated from each other,wherein the wireless transmission receiving unit comprises a MWD adapter, a second compression-resistant outer tube, an adapter, a first connection bolt, a first electrical connection line, a receiving circuit sub, an electrical connector, a second connection line, a second connection bolt, and a metal lantern stabilizer,
wherein the first connection line and the first connection bolt form a passage through a second rubber shock absorber and electrically connect a first end of the receiving circuit sub with the adapter, and the adapter is connected with the MWD adapter through the second compression-resistant outer tube, and
wherein the electrical connector, the second connection line, and the second connection bolt extend form a passage through the short tube, and connect the second end of the receiving circuit sub with the metal lantern stabilizer.

US Pat. No. 9,557,346

ACCELEROMETER AND ITS FABRICATION TECHNIQUE

Chinese Academy of Scienc...

1. An accelerometer fabrication technique comprising the following steps:
(i) forming, by use of photolithography, deep etching and etching, a plurality of holes penetrating from a top silicon layer
and a bottom silicon layer to a middle silicon layer of a double-sided silicon on insulator (SOI) silicon wafer;

(ii) depositing polycrystalline silicon in the holes to fill up the holes, then growing a silicon dioxide layer on surfaces
of the top silicon layer and the bottom silicon layer of the double-sided SOI silicon wafer;

(iii) forming, by use of photolithography, deep etching and etching, a plurality of resilient E-shaped beams, range-of-motion
stops and connection beams in the top silicon layer and the bottom silicon layer of the double side SOI silicon wafer, then
growing, by use of thermal oxidation, silicon dioxide on exposed surfaces of the resilient E-shaped beams, the range-of-motion
stops and the connection beams, or depositing, by use of chemical vapor deposition (CVD), a layer of silicon dioxide on exposed
surfaces of the resilient E-shaped beams, the range-of-motion stops and the connection beams;

(iv) removing, by use of photolithography and etching, the exposed silicon dioxide in the middle silicon layer, and deep etching
the middle silicon layer to a certain depth;

(v) corroding the middle silicon layer located between a support frame and a mass in order to form free-moving resilient beams;
(vi) removing by etching the exposed silicon dioxide layer; and
(vii) bonding together in one-step the top cap silicon wafer, the processed double-sided SOI silicon wafer, and the bottom
cap silicon wafer.

US Pat. No. 9,618,342

MEMS ANTI-PHASE VIBRATORY GYROSCOPE

Chinese Academy of Scienc...

1. A MEMS anti-phase vibratory gyroscope, comprising:
two measurement structures, each measurement structure including an outer frame, an inner frame located within the outer frame,
and a mass located within the inner frame, wherein the two measurement structures are coupled with each other in the vertical
direction through the outer frame, the inner frame is coupled with the outer frame by a plurality of first elastic beams,
and the mass is coupled with the inner frame by a plurality of second elastic beams;

a top cap and a bottom cap, each coupled with a respective one of the measurement structures; and
a comb structure provided along opposite sides of the outer frame and the inner frame;
wherein the two masses vibrate toward the opposite vertical direction, and the comb structure measures the angular velocity
of rotation.

US Pat. No. 10,082,021

AZIMUTHALLY ACOUSTIC WHILE DRILLING SIGNAL RECEIVING TRANSDUCER ENCAPSULATING APPARATUS

INSTITUTE OF GEOLOGY AND ...

1. An azimuthally acoustic while drilling signal receiving transducer encapsulating apparatus comprising a drill collar body, a master control electronic housing, and an azimuthally acoustic while drilling signal receiving and processing system,wherein the azimuthally acoustic while drilling signal receiving and processing system comprises a receiving transducer, a sealing electrical connector, a preposed signal processing circuit, and a main signal processing circuit,
wherein the main signal processing circuit is mounted on the master control electronic housing,
wherein the drill collar body comprises a first cavity housing the preposed signal processing circuit, a second cavity housing the receiving transducer, and a conduit underneath a surface of the drill collar that connects the first cavity and the second cavity,
wherein the sealing electrical connector is disposed inside the conduit between the first cavity and the second cavity,
wherein the receiving transducer and the preposed signal processing circuit are electrically connected via the sealing electrical connector, and the preposed signal processing circuit and the main signal processing circuit are electrically connected, and
wherein the preposed signal processing circuit comprises a signal amplifying circuit and an analog-to-digital conversion circuit.

US Pat. No. 10,161,891

METHOD FOR CHARACTERIZING ROCK PHYSICAL CHARACTERISTICS OF DEEPLY BURIED CARBONATE ROCKS

INSTITUTE OF GEOLOGY AND ...

1. A method for characterizing rock physical characteristics of deeply buried carbonate rocks, comprising the following steps:determining a sampling position of the carbonate rocks;
extracting a core plunger sample at the sampling position;
making a rock thin section corresponding to the core plunger sample;
determining a rock type of the rock thin section by identifying surface structure characteristics of the rock thin section, wherein the rock type of the rock thin section is used for characterizing the rock type of the core plunger sample corresponding to the rock thin section;
performing a normal pressure nuclear magnetic resonance test and rock physical characteristic tests for measuring rock physical characteristics on the core plunger sample to obtain rock physical characteristic test results and a normal pressure nuclear magnetic resonance test result of the core plunger sample, wherein the rock physical characteristics comprise porosity, permeability and pore structure of the deeply buried carbonate rocks;
based on the rock type of the core plunger sample, the rock physical characteristic test results and the normal pressure nuclear magnetic resonance test result, establishing an identification plate for characterizing the correspondence between the rock type and the nuclear magnetic resonance test result, establishing a first relation for characterizing the correspondence between the porosity and the nuclear magnetic resonance test result, establishing a second relation for characterizing the correspondence between the permeability and the nuclear magnetic resonance test result, and establishing a third relation for characterizing the correspondence between the pore structure and the nuclear magnetic resonance result;
based on the identification plate, the first relation, the second relation and the third relation, according to the normal pressure nuclear magnetic resonance test result of a target rock sample, characterizing the rock type, porosity, permeability and pore structure of the target rock sample under normal pressure; and
based on the identification plate, the first relation, the second relation and the third relation, according to an overburden pressure nuclear magnetic resonance test result of the target rock sample, characterizing the porosity, permeability and pore structure of the target rock sample under its buried depth.

US Pat. No. 10,025,003

CALIBRATION METHOD UNDER NEAR-BIT WIRELESS SHORT-TRANSMISSION GROUND ENVRIONMENT BASED ON ELECTRIC FIELD THEORY

INSTITUTE OF GEOLOGY AND ...

1. A method for calibrating a near-bit wireless short-transmission system having an emitter and a receiver, comprising:placing the emitter and the receiver in a solution, wherein a resistivity value of the solution is adjustable;
connecting the emitter with the receiver using a metal wire; and
connecting the emitter to a transmitting circuit;
connecting the receiver to a receiving circuit;
transmitting a first signal from the emitter and receiving a second signal at the receiver; and
calibrating a transmitting power of the first signal and a receiving gain of the second signal by correlating an amplitude relationship between the first signal and the second signal at a plurality of resistivity values of the solution,
wherein the emitter and the receiver are immersed in the solution.

US Pat. No. 9,900,025

EFFICIENT ADAPTIVE SEISMIC DATA FLOW LOSSLESS COMPRESSION AND DECOMPRESSION METHOD

INSTITUTE OF GEOLOGY AND ...

1. An efficient adaptive seismic data flow lossless compression and decompression method, applied to a data acquired in a
geophysical equipment for efficient compression of 24-bit analog-to-digital data within the geophysical equipment, the method
comprising:
determining a size of bytes based on a size of an original data;
compressing the data into one byte if the interval of numbers is between ?64 and 63;
compressing the data into two bytes if the interval of numbers is between ?8192 and ?65 or between 64 and 8191;
compressing the data into three bytes if the interval of numbers is between 8192 and 104875 or between ?104876 and ?8192;
compressing the data into four bytes if the data is 24-bit signed integer data that is outside the interval of numbers between
?64 and 63 or outside the interval of numbers between ?8192 and ?65 or between 64 and 8191 or between 8192 and 104875 or between
?104876 and ?8192;

wherein in the data compression there are a required number of bytes and positive or negative values are needed to select
different operators and operation codes (opcodes) for a bit operation on a plurality of specified bytes;

wherein the opcode is a binary number of the byte;
wherein there are two types of operators: one is bitwise AND (&) and the other is bitwise OR (|);
setting a specified bit position;
ignoring the bytes lower than the specified byte position and not processing said lower bytes;
deleting bytes higher than the specified byte position as invalid; wherein operators and opcodes for a first byte are different
under different conditions.

US Pat. No. 10,120,795

WEAR-LEVELING NANDFLASH MEMORY READING/WRITING METHOD

INSTITUTE OF GEOLOGY AND ...

1. A method of writing data in a wear-leveling NandFlash memory, a storage space of the NandFlash memory including a storage information area, a file information area, a data area and a swap area, the method comprising:creating a new file information table in the file information area, and reading all other file information tables to determine a writing starting address of a new file;
determining whether the writing starting address of the new file is in a starting address of a block;
in response to the writing starting address of the new file being in the starting address of the block, erasing the block, and determining a return status of an erasure operation;
in response to an error being returned, indicating that the block is a bad block, finding a replacement block in the swap area to replace the bad block, and updating a bad block registration table in the storage information area;
storing to-be-written data into a data buffer of a memory;
in response to data of one page having been stored sufficiently in the data buffer, writing the data into a block in the data area, and determining a return status of the writing;
in response to an error being returned, indicating that the block where this page is located is a bad block, finding a replacement block in the swap area to replace the bad block, updating the bad block registration table in the storage information area, and copying contents of a current page and its previous page of the bad block into the replacement block;
in response to the pages being successfully written, updating the file information table, which comprises file storage starting and ending addresses, file sizes and file updating time;
repeating steps including the storing to-be-written data through the updating the file information table, until a user ends a writing operation;
determining whether any remaining data exists in the data buffer, in response to any remaining data existing in the data buffer, writing all the data remaining in the buffer into a block in the data area; and
updating the file information table.

US Pat. No. 10,186,957

SOFT-SWITCHING CONTROL CIRCUIT OF BOOST-TYPE PFC CONVERTER

INSTITUTE OF GEOLOGY AND ...

1. A soft-switching control circuit of a boost-type power factor correction converter, wherein the boost-type power factor correction converter is a three-phase six-switch boost-type power factor correction converter comprising six primary switching transistors and an auxiliary switching transistor; wherein the soft-switching control circuit comprises:a primary switch control circuit, configured for sending driving signals for the primary switching transistors by a one-cycle control algorithm, to drive two of the primary switching transistors;
a clock circuit, configured for supplying a reset signal to the primary switch control circuit to govern a control from the primary switch control circuit to the primary switching transistors; wherein the clock circuit further is configured for sending a driving signal for the auxiliary switching transistor, so as to control the auxiliary switching transistor;
wherein the clock circuit comprises a first controller and a second controller;
wherein the first controller comprises a first branch circuit and a second branch circuit; the first branch circuit is configured for receiving a clock signal, and outputting the driving signal for the auxiliary switching transistor according to the clock signal; the second branch circuit is configured for receiving the clock signal, and outputting a reset initial signal according to the clock signal;
wherein the second controller is configured for receiving the reset initial signal, and outputting a reset signal according to the reset initial signal.

US Pat. No. 10,139,355

METHOD FOR HIGH PRECISION IMAGING FOR THREE-DIMENSIONAL TOPOGRAPHY OF CRACKS IN HYDRAULIC FRACTURING TEST OF ROCKS

Institute of Geology and ...

1. A system for high precision imaging for three-dimensional topography of cracks in a rock hydraulic fracturing test, comprising: a high precision rotary hydraulic fracturing testing machine for rocks and a laboratorial x-ray industrial CT,wherein said high precision rotary hydraulic fracturing testing machine for rocks includes a frame, a support device, a rotation device, a peripheral pressurizing device and an axial pressurizing device at least partially disposed within the frame as well as a high pressure water pump at least partially disposed outside the frame,
wherein the support device is used for clamping a rock sample from upper and lower sides of the rock sample, the rotation device is connected with the support device and used for rotating the rock sample, the peripheral pressurizing device is disposed to surround the rock sample and used for applying pressure on periphery of the rock sample, the axial pressurizing device is provided below the rotation device and used for applying axial pressure to the rock sample, the high pressure water pump is used for supplying fracturing fluid into the rock sample to form fractured cracks within the rock sample,
wherein the laboratorial x-ray industrial CT is used for forming a CT image of the fractured cracks in the rock sample,
wherein the fracturing fluid is solution containing fluorine nuclides, and the system further comprises a high resolution planar array SiPM detector for nuclides which is used for receiving optical signals emitted by fluorine nuclides in the fractured cracks and then converting the optical signals into electrical signals for imaging.

US Pat. No. 10,392,247

FABRICATION PROCESS FOR A SYMMETRICAL MEMS ACCELEROMETER

CHINESE ACADEMY OF SCIENC...

1. A process for fabricating a symmetrical MEMS accelerometer, comprising:fabricating a pair of half parts for an accelerometer, for each half part:
etching a plurality of holes on the bottom surface of the silicon-on-insulator wafer with depth to the buried oxide layer using photolithography and deep etching, thus forming the first connecting part, the second connecting part, the resilient beams, and the comb structures;
etching a plurality of hollowed parts on the top surface of the silicon wafer using photolithography and deep etching;
forming a silicon dioxide layer on the top and bottom surface of the silicon wafer using thermal oxidation or chemical deposition;
bonding the top surface of the silicon wafer with the bottom surface of the silicon-on-insulator wafer;
depositing silicon nitride on the bottom surface of the silicon wafer, then removing part of the silicon nitride and the silicon dioxide layer on the bottom surface of the silicon wafer using photolithography and etching to expose part of the bottom surface of the silicon wafer;
deep etching the exposed parts of the bottom surface of the silicon wafer to the silicon dioxide layer to form the mass, and reducing the thickness of the silicon-on-insulator wafer; and
removing the silicon nitride layer and exposed parts of silicon dioxide layer on the bottom surface of the silicon wafer by etching;
bonding the two half parts of the accelerometer along their bottom surface;
removing the top silicon layers and silicon dioxide layers to form the accelerometer using deep etching and etching;
fabricating the bottom cap by hollowing the corresponding area, and depositing metal as electrodes;
bonding the accelerometer with the bottom cap; and
depositing metal on the first silicon wafer to form electrodes.

US Pat. No. 10,202,841

NEAR-BIT TOOL ATTITUDE MEASUREMENT WHILE DRILLING APPARATUS AND METHOD

INSTITUTE OF GEOLOGY AND ...

1. A near-bit tool attitude measurement while drilling method, comprising:(1) installing a measurement-while-drilling (MWD) apparatus in a bottomhole assembly near a bottom of a drill string above a near-bit stablizer,
wherein the MWD apparatus comprises a plurality of measurement sensors coupled to a measurement circuit, wherein the plurality of measurement sensors include a triaxial accelerometer, a triaxial gyroscope, a triaxial magnetic sensor, and a temperature sensor,
wherein the measurement circuit comprises a plurality of low-pass filters coupled to an analog-to-digital converter, a field programmable gate array coupled to the analog-to-digital convertor, a processor coupled to the field programmable gate array, a memory coupled to the processor, and
wherein each of the triaxial accelerometer, the triaxial gyroscope, the triaxial magnetic sensor, and the temperature sensor is coupled to one of the plurality of low-pass filters;
(2) measuring data of the triaxial accelerometer, the triaxial gyroscope, the triaxial magnetic sensor, and the temperature sensor using the MWD apparatus; correcting measured data of the triaxial accelerometer and the triaxial magnetic sensor by utilizing measured data of the temperature sensor, respectively; and calculating a first attitude angle by utilizing corrected measured data of the triaxial accelerometer and the triaxial magnetic sensor;
(3) initializing quaternions by utilizing the first attitude angle;
(4) correcting measured data of the triaxial gyroscope by utilizing the measured data of the temperature sensor; performing time updating on initialized quaternions according to the measured data of the triaxial gyroscope; and further calculating a second attitude angle by utilizing the updated quaternions;
(5) measuring data of the triaxial gyroscope, and repeating the step (4) to calculate a third attitude angle; and
(6) after 1 s to 10 s, going to the step (2), calculating the first attitude angle by reusing the data of the triaxial accelerometer and the triaxial magnetic sensor, initializing the quaternions by using the first attitude angle, and periodically initializing the quaternions to eliminate cumulative errors of the triaxial MEMS gyroscope.

US Pat. No. 10,436,009

APPARATUS FOR TESTING THE FUNCTION AND PERFORMANCE OF A ROTARY STEERABLE TOOL IN A HORIZONTAL OR INCLINED STATE

INSTITUTE OF GEOLOGY AND ...

1. An apparatus for testing a rotary steerable tool, comprising:a rotary steerable tool testing bench; and a testing unit disposed on the rotary steerable tool testing bench,
wherein, during operation, the rotary steerable tool testing bench is placed above an earth surface and supports the rotary steerable tool in a horizontal direction or in a inclined direction, and the testing unit performs a plurality of tests on the rotary steerable tool,
wherein the rotary steerable tool testing bench comprises a plurality of upper cross beams, a plurality of fixed support columns, a plurality of detachable support columns, a plurality of lower cross beams, and a plurality of lateral stabilizing support feet,
wherein at least one of the plurality of upper cross beams is connected with at least one of the plurality of lower cross beams via at least one of the plurality of fixed support columns and at least one of the plurality of detachable support columns, and
wherein each lateral stabilizing support foot is articulated via pin shafts with a trunnion connected to a lower cross beam of the plurality of lower cross beams, and one detachable limit pin is disposed on the trunnion.

US Pat. No. 10,655,280

CONSTRUCTION METHOD FOR USING MODIFIED PHOSPHOGYPSUM IN ROADBED AND SLOPE

INSTITUTE OF GEOLOGY AND ...

1. A design and construction method for using modified phosphogypsum in a roadbed and slope, wherein the method comprises the following steps:(1) preparing a phosphogypsum-containing roadbed mixture (1): weighing 90 parts by weight of phosphogypsum and 10 parts by weight of cement, and uniformly mixing and stirring the phosphogypsum and the cement to obtain a base material mixture; and weighing 2-4 parts by weight of sodium silicate, dissolving the sodium silicate in water, and adding an obtained solution to the base material mixture to obtain the phosphogypsum-containing roadbed mixture (1);
(2) mixing the phosphogypsum-containing roadbed mixture (1) with water: acquiring a part of the phosphogypsum-containing roadbed mixture (1) by using an isostatic pressing method, adding water to prepare samples with different water content, and obtaining maximum dry density and optimal moisture content of the phosphogypsum-containing roadbed mixture (1) in a same compaction energy condition;
(3) adding water to the phosphogypsum-containing roadbed mixture (1) according to the optimal moisture content obtained through the test, to make moisture content of the phosphogypsum-containing roadbed mixture (1) reach the optimal moisture content, to obtain a roadbed filler, where mixing of the phosphogypsum-containing roadbed mixture (1) is conducted in a plant mix manner by using a stock bin of a cement stabilized soil mixing station and a forced mixer; and an anti-seepage cushion layer is an anti-seepage geotechnical cloth or an anti-seepage geomembrane with a thickness not less than 1.0 mm;
(4) preparing a phosphogypsum-containing slope mixture: weighing 50 parts by weight of phosphogypsum and 50 parts by weight of planting soil, and uniformly mixing and stirring the phosphogypsum and the planting soil to obtain a slope mixture; and
(5) transporting the roadbed filler and the slope mixture to a construction site, wherein a specific construction method comprises the following:
1) leveling and compacting original ground, and laying a soil filler above a groundwater level and a surface water level, wherein a loose laying depth of each layer of laid soil filler is not greater than 40 cm, and compactness is not less than 90%;
2) laying a first anti-seepage cushion layer (2) on a full section of a top surface of a compacted soil-filled roadbed;
3) laying a first soil filler layer (3) on a full section of the first anti-seepage cushion layer (2), wherein a loose laying depth of the first soil filler layer (3) is not greater than 40 cm; conducting compaction and densification on the first soil filler layer (3) in a condition of optimal moisture content; and laying a second anti-seepage cushion layer (4) on a full section of the top surface of the first soil filler layer (3);
4) laying a second soil filler layer (5) on a full section of the second anti-seepage cushion layer (4), wherein a loose laying depth of the second soil filler layer (5) is not greater than 40 cm; conducting compaction and densification on the second soil filler layer (5) in a condition of optimal moisture content, and laying a third anti-seepage cushion layer (6) on a full section of the top surface of the second soil filler layer (5);
5) laying the phosphogypsum-containing roadbed mixture (1) on a part of the top surface of the third anti-seepage cushion layer (6), wherein a loose laying depth of each layer of phosphogypsum-containing roadbed mixture (1) is not greater than 40 cm; conducting isostatic compaction and densification in a condition of optimal moisture content; and laying a road-shoulder soil filler (7) on two sides of the top surface of the third anti-seepage cushion layer (6), wherein a laying width of the road-shoulder soil filler (7) on each side along a roadbed section direction is not less than 1.5 m, and a loose laying depth of each layer of road-shoulder soil filler (7) is not greater than 40 cm; and conducting compaction and densification on the road-shoulder soil filler (7) in a condition of optimal moisture content;
6) after the phosphogypsum-containing roadbed mixture (1) and the road-shoulder soil filler (7) are compacted to an upper embankment by layer, laying a fourth anti-seepage cushion layer (8) on full sections of the top surfaces of the phosphogypsum-containing roadbed mixture (1) and the road-shoulder soil filler (7); laying a third soil filler layer (9) on a full section of the fourth anti-seepage cushion layer (8), wherein a loose laying depth of the third soil filler layer (9) is not greater than 40 cm; and conducting compaction and densification on the third soil filler layer (9) in a condition of optimal moisture content, so as to form a filling roadbed; and
7) after the slope mixture is brushed to a design position as required, first hanging a wire entanglement; cultivating the phosphogypsum-containing slope mixture to the surface layer of the roadbed and slope, wherein a cultivation thickness is between 5 cm and 8 cm; spray-seeding grass and shrub seeds; and conducting greening protection.

US Pat. No. 10,309,984

HIGH-PRECISION PENDULOUS ACCELEROMETER

INSTITUTE OF GEOLOGY AND ...

1. A quartz pendulous accelerometer, comprising:a quartz meter, which is configured to sense an acceleration signal, and convert the acceleration signal into an inertia torque and convert the inertia torque into a meter output signal;
a capacitance-to-voltage (C-V) readout circuit, which is configured to convert the meter output signal into an input signal recognizable by a pulse generating apparatus; and
the pulse generating apparatus, which is configured to perform control algorithm conversion, oversampling and digital quantization on the input signal to obtain a quantized current pulse,
wherein the quantized current pulse is an oversampled modulated signal comprising information about a magnitude and a polarity of a feedback force and is converted into an electromagnetic pulse torque for balancing the inertia torque.

US Pat. No. 10,234,407

ENHANCED INTERVENTIONAL CT IMAGING OF CRACKS IN ROCKS DURING HYDRAULIC TESTING

Institute of Geology and ...

1. A system for high precision imaging of cracks in a hydraulic fracturing test of rock, comprising: an industrial x-ray CT in a laboratory setting, a high precision rotary platform and a hydraulic fracturing testing machine for rocks provided on the high precision rotary platform,wherein the hydraulic fracturing testing machine for rocks includes a support device, a peripheral pressurizing device, an axial pressurizing device and a high pressure water pump, wherein the support device is used for clamping a rock sample to be fractured, the peripheral pressurizing device is disposed to surround the rock sample and used for applying pressure on periphery of the rock sample, the axial pressurizing device is provided below the support device and used for applying axial pressure to the rock sample, and the high pressure water pump is used for delivering interventional contrast-enhanced agent into the rock sample to form cracks within the rock sample,
wherein the industrial x-ray CT is used for forming a CT image of the cracks within the rock sample,
wherein the interventional contrast-enhanced agent is a dispersed nano bismuth solution which is made by the following steps: stirring a dispersant with a mass fraction of 5%, a nano bismuth powder with a mass fraction of 20% and a polyethylene glycol with a mass fraction of 75% for a first time period, and vibrating them for a second time period.

US Pat. No. 10,168,432

DISTRIBUTED ELECTROMAGNETIC INSTRUMENT SYNCHRONIZATION SYSTEM AND METHOD

INSTITUTE OF GEOLOGY AND ...

1. A distributed electromagnetic instrument synchronization method, wherein the instrument comprises a transmitter and a receiver, comprising:establishing a connection between the transmitter and the receiver via a satellite;
realizing location positioning and time synchronization;
the transmitter and the receiver each acquiring a pulse per second signal and each adjusting a temperature compensated crystal oscillator according to the pulse per second signal to reach a preset value; and
performing communication between the transmitter and the receiver through the satellite.

US Pat. No. 10,428,646

APPARATUS FOR DOWNHOLE NEAR-BIT WIRELESS TRANSMISSION

INSTITUTE OF GEOLOGY AND ...

1. An apparatus for downhole near-bit wireless transmission, comprising:a bit connecting housing;
a mud motor connecting housing;
an insulating sub made of an insulating material,
wherein the insulating sub is serially disposed between and electrically insulates the bit connecting housing from the mud motor connecting housing, and the bit connecting housing and the mud motor connecting housing form an electromagnetic transmitting positive pole and an electromagnetic transmitting negative pole, respectively; and
one or more measurement sensors and a data transmitting circuit,
wherein the data transmitting circuit comprises a metal connector disposed about a surface of the mud motor connecting housing;
an electrical connection line extending from the mud motor connecting housing to the bit connecting housing through the insulating sub, and
a high-pressure sealing single-pin connector coupled to the metal connector via the electrical connection line,
wherein the high-pressure sealing single-pin connector is affixed to the bit connecting housing via a stopper, and the stopper is of a U shape having a groove and the high-pressure sealing connector is clamped in the groove in the stopper, a spacer is installed between the stopper and the high-pressure sealing connector, and the stopper is fastened to the bit connecting housing.

US Pat. No. 10,429,539

METHOD AND SYSTEM FOR CONTROL AND DATA PROCESSING IN FIELD OPERATION WITH GROUND ELECTROMAGNETIC INSTRUMENT

INSTITUTE OF GEOLOGY AND ...

1. A system for control and data processing in field operation with a ground electromagnetic instrument, comprising:a ground electromagnetic instrument, an autonomous aircraft, and a monitoring terminal,
wherein the ground electromagnetic instrument comprises a first wireless communication module and a first processing module;
wherein the autonomous aircraft comprises a second wireless communication module configured to establish wireless communication with the first wireless communication module, a storage device, a satellite positioning and inertial navigation module, and a second processing module;
wherein the monitoring terminal comprises a third wireless communication module configured to establish wireless communication with the second wireless communication module, and a third processing module configured to transmit position coordinate parameters and working configuration parameters of the ground electromagnetic instrument to the second processing module by means of wireless communication;
wherein the second processing module stores the position coordinate parameters in the storage device, and controls the autonomous aircraft to fly to a location of the ground electromagnetic instrument according to a positioning data from the satellite positioning and inertial navigation module and the position coordinate parameters,
wherein the second wireless communication module establishes a first wireless communication link with the first wireless communication module, and the second processing module configures the working configuration parameters to the first processing module through the first wireless communication link, so that the ground electromagnetic instrument acquires data according to the working configuration parameters,
wherein the ground electromagnetic instrument is a magnetotellurics (MT) instrument.

US Pat. No. 10,379,238

INTEGRAL PACKAGING DEVICE FOR ACOUSTIC RECEIVING TRANSDUCERS WHILE DRILLING

INSTITUTE OF GEOLOGY AND ...

1. An integral packaging device for acoustic receiving transducers while drilling, wherein, comprising:a main body;
a shock absorbing rubber piece; and
a mechanical connecting unit, wherein
the main body comprises a plurality of receiving transducers of the acoustic receiving transducers, a signal processing circuit, an internal supporting frame, and a rectangular bellow;
the receiving transducers are directly arranged in the signal processing circuit;
the signal processing circuit is installed in the internal supporting frame;
the internal supporting frame is fitted in the rectangular bellow;
the rectangular bellow is of a hermetically-sealed structure and is filled with oil;
one side of the rectangular bellow has a deformable surface that is of a corrugated structure, while three other sides of the rectangular bellow each have a flat surface respectively;
the receiving transducers are arranged on the one side that has the deformable surface;
the shock absorbing rubber piece is of a U-shaped structure and is wrapped on the circumference of the main body; and
one end of the mechanical connecting unit is connected to the signal processing circuit, and the other end of the mechanical connecting unit is connected to a main control circuit in a logging while drilling instrument.

US Pat. No. 10,364,670

AZIMUTHALLY ACOUSTIC IMAGING LOGGING WHILE DRILLING (LWD) APPARATUS

INSTITUTE OF GEOLOGY AND ...

1. An azimuthally acoustic imaging logging while drilling (LWD) apparatus, comprising:a drill collar having a first section and a second section,
a low-frequency transmitting transducer, a high-frequency transmitting transducer, and a transmitting integrated circuit unit disposed on the first section of the drill collar;
a receiving transducer and a receiving integrated circuit unit disposed on the second section of the drill collar;
a sound insulator disposed between the first section and the second section;
a trace rod extending through the sound insulator, wherein a first end of the trace rod is connected with the transmitting integrated circuit unit, and a second end of the trace rod is connected with the receiving integrated circuit unit,
wherein, during operation, the low-frequency transmitting transducer and the high-frequency transmitting transducer both operate at their respective transducer resonance points.

US Pat. No. 10,578,754

SINUSOIDAL EXCITATION METHOD AND APPARATUS FOR MULTI-POLE ACOUSTIC LOGGING WHILE DRILLING

INSTITUTE OF GEOLOGY AND ...

1. A sinusoidal excitation method for multi-pole acoustic logging while drilling, comprising:generating a sinusoidal wave signal, an enable control signal, and a discharge enable signal in a signal processor;
amplifying the sinusoidal wave signal into a sinusoidal excitation signal in a power amplifier, wherein the power amplifier is coupled to a primary side of the power transformer;
outputting the sinusoidal excitation signal to a transmitting transducer through the power transformer, wherein the transmitting transducer is coupled to a secondary side of the power transformer;
outputting an acoustic signal from the transmitting transducer to a subsurface formation surrounding a wellbore;
transmitting the discharge enable signal to discharge circuit coupled with a to the primary side of the power transformer;
discharging an energy stored in the power transformer through the discharge circuit,
wherein the discharge circuit comprises a gate drive chip and two MOS transistors connected in parallel, gates of the two parallelly connected MOS transistors are connected with the gate drive chip, sources of the two parallelly connected MOS transistors are connected with a first end of a resistor, and drains of the two parallelly connected MOS transistors are connected with two primary ports of the power amplifier, respectively, a second end of the resistor is grounded, and
wherein, in the discharging step, the discharge enable signal passes through the gate drive chip and controls the gates of the two parallelly connected MOS transistors to turn on the two parallelly connected MOS transistors so that the energy stored in the power transformer is discharged via the resistor.

US Pat. No. 10,488,544

METHOD, APPARATUS AND SYSTEM FOR ARRANGING SURVEY POINTS IN FIELD OPERATION WITH GROUND ELECTROMAGNETIC INSTRUMENT

INSTITUTE OF GEOLOGY AND ...

1. A system for arranging survey points in field operation with a ground electromagnetic instrument, comprising:a planning unit configured to plan for position information of survey lines and survey points and download the position information to an aircraft in advance;
an acquisition unit configured to select the survey lines and one survey point among survey points planned in advance and acquire coordinate information of the survey point;
a control unit configured to control the aircraft to fly to physical geographic locations of the survey points according to the coordinate information of the survey points in conjunction with positioning information acquired in real time; and
a projection unit configured to hover above the physical geographic locations of the survey points and project a predetermined indication mark to the ground;
an aircraft configured to select survey lines and one survey point among survey points planned in advance and acquire coordinate information of the survey point, fly to a physical geographic location of the survey point according to the coordinate information of the survey point in conjunction with positioning information acquired in real time while projecting a first type of predetermined indication mark continuously to the ground in the process of flight, hover above the physical geographic location of the survey point and project a second type of predetermined indication mark to the ground; and
a remote manipulator configured to store the position information of survey lines and survey points planned in advance and download the position information to the aircraft,
wherein the planning unit, the acquisition unit, and the projection unit are disposed on the aircraft, and the control unit is disposed on the remote manipulator wherein, the control unit is further configured to control the aircraft to fly to the physical geographic location of a survey point according to the coordinate information of the survey point in conjunction with positioning information acquired in real time, and control the projection unit to project a first type of predetermined indication mark to the ground continuously in a process of flight to guide an engineering staff to move forward; control the aircraft to hover above the physical geographic location of the survey point and control the projection unit to project a second type of predetermined indication mark to the ground to guide the engineering staff to deploy a data acquisition and recording device; control the aircraft to sequentially fly to deployment points of electric field sensors configured for the data acquisition and recording device and hover above the deployment points, and control the projection unit to project the second type of predetermined indication mark to the ground to guide the engineering staff to deploy the electric field sensors; and control the aircraft to sequentially fly to deployment points of magnetic field sensors configured for the data acquisition and recording device and hover above the deployment points, and control the projection unit to project the second type of predetermined indication mark to the ground to guide the engineering staff to deploy the magnetic field sensors.

US Pat. No. 10,443,307

ROTARY STEERABLE DRILLING TOOL AND METHOD OF CONTROL THEREOF

INSTITUTE OF GEOLOGY AND ...

1. A rotary steerable drilling tool, comprising:a rotary mandrel;
a drill bit shaft connected to a drill bit;
a universal joint having a proximal portion connected to the rotary mandrel and a distal portion connected to the drill bit shaft;
a first non-rotary steering sleeve disposed around the rotary mandrel via an upper mud bearing and a lower mud bearing so that the rotary mandrel is rotatable relative to the first non-rotary steering sleeve;
a second non-rotary steering sleeve extends over the universal joint, wherein the second non-rotary steering sleeve has a distal portion disposed about the drill bit shaft and a proximal portion covering a distal portion of the first non-rotary steering sleeve,
wherein a near-bit-end mud bearing is disposed between the distal portion of the second non-rotary steering sleeve so that the drill bit shaft is rotatable relative to the second non-rotary steering sleeve,
wherein one or more pistons are disposed on the distal portion of the first non-rotary steering sleeve, and, when actuated, the one or more pistons press against an inner surface of the distal portion of the second non-rotary steering sleeve so that the drill bit shaft is deflected around an articulation point defined by the universal joint to adjust a direction of the drill bit shaft, and
wherein the distal portion is disposed closer to the drill bit and the proximal portion is disposed further away from the drill bit.

US Pat. No. 10,329,906

ACOUSTIC SOURCE TESTING APPARATUS OF AZIMUTHALLY ACOUSTIC LOGGING WHILE DRILLING (LWD) INSTRUMENT

INSTITUTE OF GEOLOGY AND ...

1. An acoustic source testing apparatus of an azimuthally acoustic LWD instrument, comprising a water tank (1), a silicone oil (2), a drill collar (4), an azimuthally acoustic quadrupole LWD transmitting apparatus and an acoustic signal reception apparatus;wherein the bottom of the water tank (1) is symmetrically provided with two supporting columns (3), the drill collar (4) is disposed in U-shaped grooves on the supporting columns (3), the azimuthally acoustic quadrupole LWD transmitting apparatus and the acoustic signal reception apparatus are disposed on the drill collar (4), the silicone oil (2) is filled in the water tank (1), and the drill collar (4), the azimuthally acoustic quadrupole LWD transmitting apparatus and the acoustic signal reception apparatus are completely covered in the silicone oil (2).

US Pat. No. 10,261,206

GAUSSIAN BEAM MIGRATION IMAGING METHOD AND DEVICE

INSTITUTE OF GEOLOGY AND ...

1. A Gaussian beam migration imaging method, comprising:representing, by a computing device based on execution of instructions stored in a computer readable medium, a seismic wave field of an earth surface in a form of superposition of Gaussian beams with a preset curvature parameter in time-space domain, wherein the representation of the seismic wave field of the earth surface comprises a waveform function and a time-space domain Gaussian beam based function;
setting, by the computing device based on execution of the instructions stored in the computer readable medium, a width of a Gaussian beam based function of the seismic wave field of the earth surface as a preset width, and setting a spacing between centers of adjacent Gaussian beams of the seismic wave field of the earth surface as a preset spacing, so as to obtain a set seismic wave field of the earth surface;
establishing, by the computing device based on execution of the instructions stored in the computer readable medium and according to the set seismic wave field of the earth surface, a decomposition model for the seismic wave field of the earth surface; and
applying, by the computing device based on execution of the instructions stored in the computer readable medium and based on seismic data and a medium velocity model, an optimization solution algorithm to the decomposition model for the seismic wave field of the earth surface, so as to obtain a plurality of waveform functions corresponding to the seismic data; and
propagating, by the computing device based on execution of the instructions stored in the computer readable medium and based on the medium velocity model, Gaussian beams corresponding to the plurality of waveform functions, and performing migration imaging to obtain migration imaging results,
wherein the step of representing a seismic wave field of an earth surface in a form of superposition of Gaussian beams with a preset curvature parameter in time-space domain comprises:
obtaining, according to a two-dimensional seismic acoustic wave equation, an approximate solution of the two-dimensional seismic acoustic wave equation under an assumed high-frequency condition, the obtained approximate solution representing a Gaussian beam with a curvature parameter;
setting the curvature parameter of the Gaussian beam with a curvature parameter of an earth surface as a preset curvature parameter, and superposing, by using spectrum functions with the preset curvature parameter as superposition factors, a plurality of Gaussian beams with the preset curvature parameter of the earth surface with the plurality of Gaussian beams having different parameters, so as to obtain a frequency domain seismic wave field of the earth surface represented in a form of superposition of the Gaussian beams with the preset curvature parameter;
transforming the Gaussian beams of the frequency domain seismic wave field of the earth surface into time domain Gaussian beam based functions, and transforming the spectrum functions of the frequency domain seismic wave field of the earth surface into waveform functions, so as to obtain a time domain seismic wave field of the earth surface; and transforming the time domain Gaussian beam based functions of the time domain seismic wave field of the earth surface into time-space domain Gaussian beam based functions, so as to obtain the seismic wave field of the earth surface represented in a form of superposition of Gaussian beams with the preset curvature parameter in time-space domain.

US Pat. No. 10,647,570

FABRICATION PROCESS FOR A SYMMETRICAL MEMS ACCELEROMETER

Chinese Academy of Scienc...

1. A process for fabricating a symmetrical MEMS accelerometer, comprising:fabricating a pair of half parts for an accelerometer, for each half part:
etching a plurality of holes on a bottom surface of a first silicon wafer using photolithography and deep etching to form a plurality of resilient beams, first connecting parts, second connecting parts, and a plurality of comb structures;
etching a plurality of hollowed parts on a top surface of a second silicon wafer using photolithography and deep etching;
forming a silicon dioxide layer on the top and bottom surface of the second silicon wafer using thermal oxidation or chemical deposition;
bonding the bottom surface of the first silicon wafer with the top surface of the second silicon wafer;
depositing a layer of silicon nitride on the bottom surface of the second silicon wafer, and removing parts of the silicon nitride layer and silicon dioxide layer on the bottom surface of the second silicon wafer using photolithography and deep etching;
deep etching the exposed parts of the bottom surface of the second silicon wafer to the silicon dioxide layer located on the top surface of the second silicon wafer, and reducing the thickness of the first silicon wafer;
removing the silicon nitride layer, and etching the silicon dioxide to form the mass;
bonding the two half parts of the accelerometer along their bottom surface;
deep etching to form a movable accelerometer;
fabricating a bottom cap by hollowing out the corresponding area, and depositing metal as electrodes;
bonding the accelerometer with the bottom cap; and
depositing metal on the first silicon wafer to form electrodes.

US Pat. No. 10,643,862

SYSTEM-LEVEL PACKAGING METHOD AND PACKAGING SYSTEM BASED ON 3D PRINTING

INSTITUTE OF GEOLOGY AND ...

1. A system-level packaging method based on 3D printing method, comprising the following steps:S1, providing a carrier which is ceramic, and wherein a roughness of an upper surface of the carrier is less than 50 micrometers;
S2, printing a first packaging substrate which is aluminum nitride on the surface of the carrier by using the 3D printing method, wherein metal wires are disposed on the first packaging substrate;
wherein a preparation method of the metal wires includes the following steps: spraying metal powder on a surface of the substrate according to a preset path by using a spray head, and synchronously melt the metal powder;
S3, fixing a first component to the first packaging substrate, and electrically connecting the first component to the first packaging substrate, wherein the first component is fixed by a flip-chip bonding method;
wherein a surface of the packaging substrate is provided with a groove matching with a corresponding component, and the corresponding component is embedded in the groove;
S4, printing an adhesive layer on the first packaging substrate;
S5, continuing to print a second packaging substrate on the surface of the first packaging substrate by using the 3D printing method, wherein metal wires are disposed on the second packaging substrate, and the second packaging substrate has an electrical connection with the first packaging substrate;
S6, fixing a second component to the second packaging substrate, and electrically connecting the second component to the second packaging substrate;
S7, repeating steps S2-S6 to form a multilayer system-level packaging structure;
wherein layers of the packaging substrates are electrically connected by a vertical via, and the vertical via is formed at the same time when the layers of the packaging substrates are formed;
S8, printing a packaging cover plate on the surface of the topmost packaging substrate by using the 3D printing method;
S9, pressing the multilayer system-level packaging structure by using an isostatic pressing method;
S10, removing the carrier to form a final packaging structure; and
S11, forming an electrical connection pathway with the outside of the final packaging structure.

US Pat. No. 10,619,478

DEVICE FOR POWER TRANSMISSION AND SIGNAL TRANSFER BETWEEN STATOR AND ROTOR OF SCREW DRILLING TOOL

INSTITUTE OF GEOLOGY AND ...

1. A device for power transmission and signal transfer between a stator and a rotor of a screw drilling tool, comprising:an electric power and signal transmitting portion;
an electric power and signal receiving portion; and
a transfer portion, wherein
the electric power and signal transmitting portion and the electric power and signal receiving portion are configured to transfer electric power and signals generated by a mud generator in a contactless manner;
the transfer portion is configured to transfer the electric power and signals to the rotor, so that the electric power and signals are further transmitted downward through a main body of the screw drilling tool;
both the electric power and signal transmitting portion and the electric power and signal receiving portion are disposed inside a drill collar, the electric power and signal transmitting portion is connected through a wire to the mud generator and a measurement while drilling (MWD)/logging while drilling (LWD) instrument; and
the electric power and signal receiving portion is mechanically connected via the transfer portion to the rotor, wherein the electric power and signals are transferred through the wire to the rotor, wherein the electric power and signal transmitting portion and the electric power and signal receiving portion comprise an external centralizer, an internal centralizer, an external excitation coil, an internal excitation coil, an electric excitation transmitting circuit board, and an electric excitation receiving circuit board, wherein
the external centralizer is fixedly connected inside the drill collar;
the internal centralizer is mounted inside the drill collar via a mud bearing; one end of the external centralizer contacts with one end of the internal centralizer;
a wire through-hole and a fan-shaped mud flow channel are provided inside the external centralizer and the internal centralizer, respectively;
a transmitting circuit compartment is provided at the other end of the external centralizer;the electric excitation transmitting circuit board is arranged inside the transmitting circuit compartment;the transmitting circuit compartment is sealed by a transmitting circuit compartment cover, a receiving circuit compartment is provided at one end of the internal centralizer;
the electric excitation receiving circuit board is arranged inside the receiving circuit compartment, and the receiving circuit compartment is sealed by a receiving circuit compartment cover;
the internal excitation coil is arranged on the end of the internal centralizer that contacts with the external centralizer and is connected to the electric excitation receiving circuit board through a wire;
the external excitation coil and the internal excitation coil are mounted concentrically without contact, and the external excitation coil is fixed to an inner side wall of the drill collar; and
the external excitation coil is connected to the electric excitation transmitting circuit board through a wire.

US Pat. No. 10,612,926

MEMS ANTI-PHASE VIBRATORY GYROSCOPE

Institute of Geology and ...

9. A method for fabricating a MEMS anti-phase gyroscope, comprising(i) growing an epilayer on the surface of a top silicon layer of a first silicon on insulator (SOI) silicon wafer having the top silicon layer, a bottom silicon layer, and a buried silicon layer between the top silicon layer and the bottom silicon layer;
(ii) forming a first silicon dioxide layer on the surface of the epilayer;
(iii) coating the top silicon layer with photoresist;
(iv) forming a first plurality of holes with depth to the epilayer at an outer portion of the surface of the first silicon dioxide layer and a second plurality of holes with depth to the epilayer at an inner portion of the surface of the first silicon dioxide layer;
(v) etching through the epilayer from the first plurality of holes located at the outer portion of the first silicon dioxide layer, and etching the top silicon layer to a certain depth;
(vi) removing the photoresist, and etching the first plurality of holes located at the outer portion of the first silicon dioxide layer to the buried oxide layer in order to form an outer frame and a plurality of first elastic beams;
(vii) etching the second plurality of holes to the top silicon layer in order to form a plurality of second elastic beams;
(viii) removing the first silicon dioxide layer;
(ix) forming a protection layer on the surface of the top silicon layer and the epilayer;
(x) removing the protection layer in a horizontal direction, then bonding the silicon on insulator wafer with a top cap;
(xi) thinning and polishing the bottom silicon layer to a certain thickness, then growing or depositing a second layer of silicon dioxide on the surface of the bottom silicon layer;
(xii) removing a portion of the second silicon dioxide layer located at an inner portion of the bottom silicon layer, thus exposing the inner portion of the bottom silicon layer;
(xiii) etching the inner portion of the bottom silicon layer to the buried oxide layer;
(xiv) removing the buried oxide layer located at the inner portion of the bottom silicon layer and a remaining portion of the second silicon dioxide layer located on the surface of the bottom silicon layer;
(xv) etching the exposed inner portion of the bottom silicon layer until the inner portion reaches the epilayer and the bottom silicon layer reaches the buried oxide layer, thus forming an inner frame and a mass;
(xvi) removing the buried oxide layer located on the surfaces of the inner frame, the first elastic beams, and the mass;
(xvii) removing the protection layer by etching; and
(xviii) repeating steps (i) through (xvii) to form a second silicon on insulator silicon wafer and performing a back-to-back-silicon-silicon bonding of the first and second silicon on insulator silicon wafers thereby forming a MEMS anti-phase vibratory gyroscope.

US Pat. No. 10,612,372

AZIMUTHAL ACOUSTIC LOGGING WHILE DRILLING APPARATUS AND MEASUREMENT METHOD

Institute of Geology and ...

1. An azimuthal acoustic LWD apparatus, comprising a centralizer, a transmitting circuit, transmitting transducers, an acoustic insulator, a receiving transducer array, ultrasonic transducers and a receiving circuit sequentially disposed on a drill collar; wherein the receiving circuit comprises an azimuth measurement module, the azimuth measurement module measures a magnetic toolface angle by adopting a dual-axis magnetic sensor, and the measured magnetic toolface angle is used to determine a current rotation angle of the azimuthal acoustic LWD apparatus; two axial directions of the dual-axis magnetic sensor are orthogonal to each other, one of which is in a radial direction of the azimuthal acoustic LWD apparatus, and is in the same straight line as the transmitting transducers, and the other axial direction is in a tangential direction of the azimuthal acoustic LWD apparatus;wherein the receiving circuit processes time series data measured in an axial direction of the dual-axis magnetic sensor by using a Fast Fourier Transform, and extracts frequency information for obtaining a rotation speed of the azimuthal acoustic LWD apparatus; and
wherein the ultrasonic transducers are configured to measure a wellbore diameter, and a measured result of the wellbore diameter is used to determine a current position of the azimuthal acoustic LWD apparatus in a wellbore in combination with the magnetic toolface angle measured by the azimuth measurement module, and further realizes eccentricity correction and quality control of measured data.

US Pat. No. 10,317,204

NEAR-BIT DYNAMIC WELL DEVIATION ANGLE MEASUREMENT METHOD AND APPARATUS

INSTITUTE OF GEOLOGY AND ...

1. A near-bit dynamic well deviation angle measurement apparatus disposed above a drill bit in a drill string, comprises:a circuit board having a data processing unit and a filter; and
2n+1 accelerometers, n being an integer greater than 1,
wherein the 2n+1 accelerometers includes a first accelerometer installed in a longitudinal direction Z of the measurement apparatus and measuring a value of Az?, and n pairs of accelerometers disposed orthogonally to the first accelerometer,
wherein two accelerometers within each pair are orthogonal to each other, and measure a value of Axi and a value of Ayi, i=1 to n, respectively,
wherein the circuit board receives Axi, Ayi, and calculates Ax? and Ay? according to Ax?=?i=1n Axi and Ay?=?i=1n Ayi,
wherein the filter is configured to filter noises caused by high-frequency vibration and impact interference during drilling from Ax?, Ay?, and Az? to obtain Ax, Ay, and Az,
wherein Ax?, Ay? and Az? represent components of a gravitational acceleration having noises from high-frequency vibrations and impact interferences in directions X, Y and Z, respectively, wherein Ax, Ay, and Az represent the filtered components of the gravitational acceleration in directions X, Y and Z, respectively, and
wherein xi represents the direction X in accelerometer pair number i, and yi represents direction Y in accelerometer pair number I.