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A Construction Method for Numerical Simulation of Fluid-solid Interaction Problems in Hydraulic Fracturing

A fluid-solid coupling and hydraulic fracturing technology, applied in CAD numerical modeling, electrical digital data processing, special data processing applications, etc., can solve problems such as unstable numerical calculations, inability to implement implicit algorithms, and non-convergent calculations. Achieve the effect of easy promotion and application

Active Publication Date: 2019-07-12
INST OF MECHANICS CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
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Problems solved by technology

[0010] The technical problem to be solved by the present invention is that simply using an implicit algorithm or an explicit algorithm to solve the fluid-solid coupling problem of hydraulic fracturing will cause the numerical calculation to be unstable and cause the calculation to not converge, but the general-purpose finite element commercial software still cannot realize the implicit Formula algorithm and display algorithm are used to solve the fluid-solid coupling problem in the process of hydraulic fracturing

Method used

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  • A Construction Method for Numerical Simulation of Fluid-solid Interaction Problems in Hydraulic Fracturing
  • A Construction Method for Numerical Simulation of Fluid-solid Interaction Problems in Hydraulic Fracturing
  • A Construction Method for Numerical Simulation of Fluid-solid Interaction Problems in Hydraulic Fracturing

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Embodiment 1

[0030] as attached figure 1 As shown, the present invention provides a method for constructing numerical simulation of fluid-solid coupling problems in hydraulic fracturing, comprising the following steps:

[0031] 1) Determine the model parameters and enter the program according to actual engineering problems; the present invention adopts the fracture zone model (ZdeněkP. B.H.Oh.Crack band theory for fracture of concrete[J].Materials&Structures,1983,16(3):155-177.)

[0032] 2) According to the stress balance equation In the time domain, the explicit central difference method is used to iteratively solve, that is In the formula, ρ is the solid density, is the acceleration, α is the damping coefficient, is the velocity, σ is the stress tensor, f is the physical force, u is the displacement, i is the number of iteration steps, and Δt is the time step. Solve solids problems with explicit algorithms, including nodal accelerations node speed Node displac...

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Abstract

The invention provides a construction method of numerical simulation of fluid-solid coupling problem in hydraulic fracturing, comprising the steps of a) the display algorithm is employed to solve solid problems, comprising nodal acceleration, nodal speed and nodal displacement; b) the implicit algorithm is employed to solve fluid problems, comprising flow and pressure; c) the crack band model is employed to calculate the effect of fluid flow field to solid stress field respectively,thus realizing the calculation of fluid-solid coupling. The invention provides an effective numerical algorithm for numerical simulation of fluid-solid coupling problem in hydraulic fracturing; such algorithm can efficiently solve the unstable problem of calculation to numerical simulation of fluid-solid coupling problem in hydraulic fracturing. The computing platform established based on such method can simply and efficiently achieve numerical simulation under different working conditions, can be easily spread and applied to calculation and analysis of practical shale gas exploitation engineering.

Description

technical field [0001] The invention relates to a construction method for numerical simulation of fluid-solid coupling problems in hydraulic fracturing. Background technique [0002] As a conventional technology, hydraulic fracturing is widely used in the field of shale gas exploitation, and its development directly affects the production and economic effects of shale gas exploitation. Efficient and accurate prediction of the hydraulic fracturing process plays an extremely important role in fully understanding and mastering the key mechanical issues, developing and innovating more advanced hydraulic fracturing technologies, and improving the efficiency and production of shale gas extraction. The hydraulic fracturing process is very complex, involving key issues such as fracture initiation and expansion caused by fluid pressure, solid deformation caused by fluid pressure in fractures, and fluid flow in fractures. In actual engineering, mechanical mechanisms such as natural f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/20G06F2111/10
Inventor 苏业旺李明耀
Owner INST OF MECHANICS CHINESE ACAD OF SCI
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