Physical simulation system and method for fracture propagation in shale

Abstract

The invention discloses a physical simulation system and method for fracture propagation in shale. The system comprises a drilling rig, a sealing machine, a machine tool, a true triaxial physical simulation testing machine, a hydraulic fracturing servo pump pressure control system, acoustic emission three-dimensional space location monitoring equipment and an industrial CT (computed tomography) machine, wherein the drilling rig, the sealing machine and the machine tool are jointly used for processing acquired shale into a fracturing sample; the true triaxial physical simulation testing machine is used for loading simulated three-dimensional ground stress to the fracturing sample; the hydraulic fracturing servo pump pressure control system is used for providing a fracturing fluid for the fracturing sample, so that a hydraulic fracturing process can be simulated; the acoustic emission three-dimensional space location monitoring equipment is used for monitoring the simulated hydraulic fracturing process in real time; the industrial CT machine is used for preforming tomography scanning on the fracturing sample before and after hydraulic fracturing. The physical simulation system for fracture propagation in the shale can be used for researching fracture initiation, expansion and extension laws of anisotropic shale in the hydraulic fracturing process, so that fracture information can be distinguished more accurately, high-precision basic data are provided for fracturing construction design, technical support is provided for site fracturing construction, and the yield is increased.

Description

technical field [0001] The invention relates to the technical field of shale gas reservoir fracturing and production stimulation, in particular to a physical simulation system and method for crack expansion in shale. Background technique [0002] Shale gas is an unconventional natural gas that hides in shale or mudstone layers in a free or adsorbed state. my country is rich in shale gas resources. With the advancement of mining technology and the state's subsidy support for mining, the development and utilization of shale gas will enter a period of rapid development. The development of shale gas exploitation in foreign countries is relatively early. The main exploitation technologies include horizontal well technology, multi-layer fracturing technology, clean water fracturing technology and repeated fracturing technology. my country's shale gas exploitation is still in its infancy. [0003] The anisotropic properties of shale have an important impact on fracturing operation...

AI Technical Summary

Problems solved by technology

However, because sandstone and carbonate rocks are not as undeveloped as shale bedding, and the anisotropy characteristics are not as obvious as shale, so the research results on them cannot be directly applied to shale research

Therefore, there is still no physical simulation test method for deep layered anisotropic shale reservoirs.

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