High temperature and high pressure conventional triaxial direct shear fracture seepage coupling test device and its application method

Abstract

The invention relates to a high-temperature and high-pressure conventional three-axis direct shear fracture-seepage coupling test device. Two shear pressure heads and two pressure components are arranged above and below the rock sample in a manner symmetrical to the center of the rock sample. The shear ram includes first and second shear ram bodies. Pressure components include rubber bladders and backing plates. A portion of the pressure assembly is within the space formed by the height difference between the first and second shear rams. The rubber bladder applies pressure to the rock sample through the backing plate. The seepage medium in the first seepage network groove provided on the main body of the second shear pressure head and the second seepage network groove provided on the backing plate applies osmotic pressure to the rock sample. The triaxial testing machine applies lateral confining pressure, axial pressure and high temperature to the rock sample. The beneficial effect is that the test device can carry out conventional triaxial direct shear fracture seepage tests under high temperature and high pressure conditions. The simple structure, the optimized sealing design, the connection mode of the piston part and the rubber bladder, and the design of the liquid injection method greatly improve the practicability and reliability of the present invention.

Description

technical field [0001] The invention relates to the technical field of rock experiments, in particular to a high-temperature and high-pressure conventional three-axis direct shear fracture seepage coupling test device and a use method. Background technique [0002] With the in-depth development of resource mining and energy development in rock engineering, in order to facilitate the development of geothermal energy production, oil and gas production, deep well injection, carbon dioxide sequestration and nuclear waste treatment, it is necessary to predict and analyze the flow of seepage media through fracture networks. description, in order to better improve the technical capabilities of mining and development, and avoid the inaccurate prediction and description of seepage medium flowing through the fracture network during actual mining, which may cause earthquakes induced by seepage medium injection, CO 2 and the hazards of gas storage leaks. The basic occurrence environmen...

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Problems solved by technology

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a high-temperature and high-pressure conventional three-axis direct shear fracture-seepage coupling test device and its use method, which solves the problem that the existing rock sample shearing device cannot perform rock three-axis direct shear. The technical problem of the fracture permeability test and the inability to meet the temperature-seepage-stress (THM) multi-field coupling environment required for the rock triaxial direct shear fracture test

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