Hydraulic shear stimulation dry hot rock reservoir anti-reflection simulation experiment system and experiment method

Abstract

The invention discloses a hydraulic shear stimulation dry hot rock reservoir anti-reflection simulation experiment system and experiment method. The system comprises an experiment part, a water circulation part and a control part; the experiment part is used for carrying out a simulation experiment on a test piece and comprises a frame, an experiment assembly and a pressure applying assembly are fixedly connected to the frame, and the pressure applying assembly and the frame are fixedly installed; the test piece is arranged in the experiment assembly; the water circulation part is used for performing water circulation simulation hydraulic shearing in a simulation experiment; the water circulation part comprises a water inlet assembly and a water return assembly; the water inlet assembly and the water return assembly are communicated with the experiment assembly; the control part is used for automatically controlling the experiment; the control part is electrically connected with the experiment part and the water circulation part. The experimental device is simple in structure, the experimental method is novel, the constant-rigidity boundary condition under the deep stratum can be truly simulated, the hydraulic shear slippage of the rock stratum can be simulated, the law and condition of slippage can be explored, theoretical support is provided for deep geothermal reservoir anti-reflection, and the process of geothermal large-scale commercial mining is accelerated.

Description

technical field [0001] The invention relates to the technical field of hot dry rock geothermal development, in particular to a simulation experiment system and an experimental method for hydraulic shear stimulation of hot dry rock reservoir permeability enhancement simulation. Background technique [0002] The English name of the Enhanced Geothermal System is Enhanced Geothermal System (EGS). It uses engineering technology to artificially build a fracture network in the underground high-temperature rock body or improve the original fracture network. The constructed or improved fracture network has sufficient Permeability, its rock volume and fracture surface area are large enough to increase the temperature of cold water injected from the surface through the fracture network and return to the surface, using flash evaporation or double cycle power generation or heat supply. Therefore, EGS includes not only engineering-built underground heat storage, but also rock underground ...

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Problems solved by technology

Existing EGS is aimed at shallow geothermal mining, and generally the channels are corroded by acid and supported by proppant; however, the deep stratum is granite, which has high hardness, and the acid cannot corrode the channels, and the gaps in the existing cracks The width is larger than the diameter of the proppant, and the propping effect is not good. At the same time, due to the huge stress in the deep part, it is easy to cause the proppant to be crushed

[0003] Deep geothermal mining generally uses hydraulic fracturing to form a fracture network, forming water flow channels, and hydraulically driving the granite strata to slide to form supports to prevent the closure of fracture channels under the action of huge in-situ stress; however, the current hydraulic shear slip simulation The experiment uses a constant load boundary condition, which is inconsistent with the constant stiffness boundary of the actual formation, and the simulated experimental data is not representative. Therefore, there is an urgent need for a hydraulic shear stimulation simulation experiment system and experimental method for hot dry rock reservoir permeability enhancement To carry out simulation under constant stiffness boundary conditions, obtain more representative simulation data, and provide data support for deep hot dry rock geothermal development

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