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A Boundary Element Method Based Simulation Method for Full 3D Fracture Intersection Process

A technology of process simulation and boundary element, applied in the field of fracture simulation, can solve the problem of being unable to deal with the dynamic changes of fracture shape

Active Publication Date: 2022-03-25
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

The existing techniques for dealing with fracture intersecting grids are all aimed at the situation where the fracture surface is fixed, and cannot deal with the dynamic changes of fracture morphology during the process of fracture propagation

Method used

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  • A Boundary Element Method Based Simulation Method for Full 3D Fracture Intersection Process
  • A Boundary Element Method Based Simulation Method for Full 3D Fracture Intersection Process
  • A Boundary Element Method Based Simulation Method for Full 3D Fracture Intersection Process

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Embodiment 1

[0108] This embodiment provides a full three-dimensional fracture intersection process simulation method based on the boundary element method. The model assumes that the boundary condition is the constant injection fluid flow boundary, which includes the following steps:

[0109] (1) Time step and injection pressure initialization; the time step Δt of the last time step n n and injection point pressure As the initial guess at the current time step n+1, the subscript inj indicates injection;

[0110] (2) Calculation of fracture opening; make all fracture unit pressures equal to injection point pressure, and use boundary element algorithm to calculate current time step and fracture opening under injection point pressure The subscript i is the number of the fracture unit, k is the number of the iterative step for updating the injection point pressure, and j is the number of the iterative step for updating the time step;

[0111] The calculation method of crack opening is as f...

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Abstract

The present invention relates to the technical field of fracture simulation, in particular to a method for simulating a full three-dimensional fracture intersecting process based on a boundary element method, which includes the following steps: (1) time step and injection pressure initialization; (2) fracture opening Calculation; (3), mass conservation check; (4), judging whether the fracture propagation condition is satisfied; (5), fracture propagation calculation; (6), self-adaptive adjustment of natural fracture grid; (7), self-adaptive adjustment of artificial fracture grid; (8), enter the calculation of the next time step. The invention can realize the dynamic and self-adaptive adjustment of the grids in artificial and natural fractures during the intersection process of artificial fractures and natural fractures, and then provide important technical support for 3D fracture intersection simulation using boundary element method, and promote full 3D fracture propagation simulation further development.

Description

technical field [0001] The invention relates to the technical field of fracture simulation, in particular to a method for simulating a full three-dimensional fracture intersection process based on a boundary element method. Background technique [0002] The fracture propagation simulation using the boundary element method has the advantages of fewer unknowns to be solved and high calculation accuracy, and is suitable for simulating large-scale hydraulic fracturing processes. However, the current full 3D fracture propagation model based on the boundary element method has not considered the fracture intersecting situation, resulting in insufficient description of the true shape of the hydraulic fracture network, which affects the formulation and optimization of the fracturing operation plan. The grid problem is one of the main reasons hindering the development of a full 3D fracture network model. When the 3D fracture planes intersect, the grid processing is very complicated, ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F111/04G06F119/14
CPCG06F30/20G06F2111/04G06F2119/14
Inventor 唐慧莹崔二龙虎丹丹张景黄浩勇张烈辉
Owner SOUTHWEST PETROLEUM UNIV
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