US Patent No. 10,428,641

DRAW-DOWN PRESSURE APPARATUS, SYSTEMS, AND METHODS


Patent No. 10,428,641
Issue Date October 01, 2019
Title Draw-down Pressure Apparatus, Systems, And Methods
Inventorship Xinpu Shen, Houston, TX (US)
Guoyang Shen, Houston, TX (US)
William Standifird, Fulshear, TX (US)
Assignee LANDMARK GRAPHICS CORPORATION, Houston, TX (US)

Claim of US Patent No. 10,428,641

1. A method, comprising:building a global model of a field including an actual wellbore extending through geological formations, the global model accounting for the details of the geological formations included in the field around the wellbore;
determining, from the global model, stress components in the field;
building a sub-model accounting for a portion of the field at the location of the wellbore using a finite element modeling tool, the sub-model including a plurality of formation elements;
applying the stress components to the sub-model as boundary conditions;
modeling the wellbore by removing formation elements from the sub-model to define a well surface in the sub-model;
modeling a perforated portion of the wellbore by removing formation elements from the sub-model to define at least one perforation tunnel surface in the sub-model, the perforation tunnel surface intersecting the well surface in the sub-model and extending laterally from the well surface in the sub-model;
determining pressure values for a set of draw-down pressures of a fluid present downhole in the perforated portion of the wellbore;
determining a value of strain in the perforated portion of the wellbore by applying the pressure values determined for the set of draw-down pressures to the perforation tunnel surface in the perforated portion in the sub-model; and
operating a controlled device that is fluidly coupled to the wellbore to control a rate of hydrocarbon extraction from the wellbore, when the value of strain determined is greater than a selected threshold, wherein operating the controlled device adjusts the set of draw-down pressures of the fluid present downhole in the perforated portion of the wellbore.