A thermal-fluid-solid coupled fracture propagation simulation method for poroelastic rock mass
A technology of fracture propagation and simulation method, which is applied in the field of exploration and development of new mining energy, can solve the problem that the accuracy of calculation results depends on the quality of grid generation, and achieve high performance
Active Publication Date: 2022-03-29
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology
The developed extended finite element method can simulate multiple hydraulic fractures, and the fracture propagation is improved by the element, but the accuracy of the calculation results still depends on the mesh generation quality
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[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0036] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0037] The present invention provides a fracturing numerical simulation method based on thermal-hydro-mechanical (THM) coupling effect, which combines the accuracy of finite element stress solution in continuum with ...
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The invention relates to a thermal-fluid-solid coupling fracturing crack propagation simulation method for poroelastic rock mass, comprising: converting the poroelastic rock mass medium into a finite element method model and a finite volume method model; calculating solid deformation and fluid flow respectively ;Establish the heat transfer model between the fracturing fluid and the rock matrix, and calculate the heat transfer between the fracturing fluid and the rock matrix; update and iterate the three variables of solid deformation, fluid flow, and heat transfer between the fracturing fluid and the rock matrix , so that solid deformation and fluid flow and thermal diffusion are in balance; use discrete element method to deal with solid fracture, obtain a new hydraulic fracture network; evaluate hydraulic tensile and shear fractures, and analyze the hydraulic fractures The shape of the network. The invention uses the finite element method and the finite volume method to calculate various physical quantities, and uses the discrete element method to process solid fractures, so as to realize the expansion simulation of hydraulic fracturing tensile and shear fractures of poroelastic rock mass under heat-fluid-solid coupling.
Description
technical field [0001] The invention relates to the technical field of exploration and development of new mining energy sources (coal bed gas, tight gas, shale gas), in particular to a thermal-fluid-solid coupling fracturing crack propagation simulation method for poroelastic rock mass. Background technique [0002] The temperature, stress and fracturing fluid flow of rock mass in tight oil and gas reservoirs are the three main factors affecting the crack propagation behavior of rock mass hydraulic fracturing. Due to the complex coupling effect between the temperature field, the seepage field and the stress field (or strain field), it is necessary to analyze the Thermal-Hydro-Mechanical (THM) coupling mechanism of rock mass fracturing. Simply put, in the temperature field, seepage field, and stress field, thermal action can generate thermal stress in the rock mass and cause changes in solid properties such as the elastic modulus and Poisson's ratio of the rock mass, and at t...
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IPC IPC(8): G06F30/23G06F30/28G06F113/08G06F119/08G06F119/14
CPCG06F30/23G06F30/28G06F2113/08G06F2119/08G06F2119/14
Inventor 王永亮刘娜娜
Owner CHINA UNIV OF MINING & TECH (BEIJING)