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Numerical simulation method for fluid-solid coupling in hydraulic fracturing process of single-fracture rock

A hydraulic fracturing and numerical simulation technology, applied in CAD numerical modeling, electrical digital data processing, instruments, etc., can solve the problems of difficulty in revealing microscopic mechanisms, high cost, and long hydraulic fracturing time.

Active Publication Date: 2021-05-18
NANJING UNIV
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Problems solved by technology

However, in-situ hydraulic fracturing is time-consuming and costly
Moreover, the data are often highly discrete, and it is difficult to reveal the microscopic mechanism of complex macroscopic phenomena.

Method used

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  • Numerical simulation method for fluid-solid coupling in hydraulic fracturing process of single-fracture rock
  • Numerical simulation method for fluid-solid coupling in hydraulic fracturing process of single-fracture rock
  • Numerical simulation method for fluid-solid coupling in hydraulic fracturing process of single-fracture rock

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings.

[0034] A numerical simulation method for fluid-solid coupling in a single fracture rock hydraulic fracturing process, comprising the following steps:

[0035] Step S1, such as figure 1 Shown is the flow chart of building a two-dimensional model box for hydraulic fracturing, creating a Box modeler object B, where sampleW represents the width of the model box, sampleL represents the length of the model box, and sampleH represents the height of the model box; set sampleL=0, the The model is set to be a 2D model.

[0036] Step S2, setting the initial sample unit average radius and boundary unit radius; wherein the ratio of the sample maximum particle size to the minimum particle size is 1+distriRate, and distriRate represents the dispersion coefficient of the sample particle unit radius.

[0037] According to the set width, height, and length set to 0, a 3D model box of ...

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Abstract

The invention provides a numerical simulation method for a hydraulic fracturing process of a single-fracture rock based on a pore density flow method, which comprises the following steps of: firstly, establishing a rock-soil body discrete element particle accumulation body, namely, establishing a basic initial stratum accumulation model by simulating a gravity deposition process of a real world; obtaining a material conforming to the property of a real physical world material through material training; dispersing a rock-soil body into mutually contacted solid particles, subdividing and identifying pores according to a particle accumulation skeleton, and establishing a hydraulic fracturing numerical model; and carrying out time step iterative calculation until the rock-soil body model is balanced, and outputting a simulation result. According to the method, fluid density and pressure changes caused by different prefabricated fracture angles and prefabricated fracture angle changes are considered, a very complex and high-cost hydraulic fracturing experiment can be efficiently simulated based on the pore size, complex macroscopic phenomena can be explained, and hydraulic fracturing effects under different prefabricated fractures can also be simulated.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploitation, and mainly relates to a numerical simulation method for fluid-solid coupling in a single-crack rock hydraulic fracturing process. Background technique [0002] The porosity and permeability of rock reservoirs are very low, making mining very difficult. As the main form of shale gas exploitation at present, hydraulic fracturing is an important means to improve the utilization rate of oil and gas resources in my country. However, the low porosity and low permeability of rock reservoirs determine that the key to effective utilization of rock reservoirs lies in the formation of effective fracture networks. Under the joint action of external load and water pressure, the rock mass with natural defects (cracks, holes, etc.) can easily lead to the development of internal cracks. Therefore, it is very important to study the mechanism of crack propagation in depth to establish a new netwo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/28G01N33/24G06F111/10G06F113/08G06F119/14
CPCG06F30/28G01N33/24G06F2113/08G06F2119/14G06F2111/10
Inventor 张鸿勇朱莉莉刘春张利伟乐天呈王岳范观盛闵寅通
Owner NANJING UNIV
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