Visual uniformly-distributed hydraulic fracturing ground stress measurement device and measurement method

Abstract

The invention discloses a visual uniformly-distributed hydraulic fracturing ground stress measurement device and a measurement method, which belongs to a ground stress measurement device and a measurement method. The method comprises steps: 1, a surrounding rock is selected for testing the ground stress; 2, a related drilling rig is used for carrying out construction and drilling on a coal-rock mass; 3, a device is mounted, and a hydraulic lifting device is used for lifting a hydraulic fracturing and monitoring device to a surrounding rock ground stress test section and to be fixed; 4, liquid injection and pressurization are carried out, an explosion-proof high-pressure pump is used for water injection and pressurization on a collar hose via a pressurization hose, ground stress measurement through indirect hydraulic fracturing is realized, and a pressure sensor and a camera are opened to monitor the stress changes and surrounding rock deformation; 5, the pump is closed, and when the collar hose continuously pressurizes on the surrounding rock until a surrounding rock crack to be completely fractured, and the high-pressure pump is closed; 6, pressure relief is carried out, and when the pressure in the ground stress test section tends to be stable, the pressure in the test section is released; and 7, the above steps from the fourth to the sixth are repeated for three to five times, stress parameters are obtained, the rock fracturing state and the crack extending state are judged, and the data are processed.

Description

technical field [0001] The invention relates to a ground stress measurement device and method, in particular to a ground stress measurement device and method based on visualized uniform hydraulic fracturing. Background technique [0002] In-situ stress is a natural stress that exists in the earth's crust and has not been disturbed by engineering. It has a certain influence on the deformation and destruction of surrounding rock in underground engineering roadways. According to different measurement principles and corresponding measurement equipment, there are different ground stress test methods. At present, there are many methods for measuring in-situ stress, among which stress relief method and hydraulic fracturing method are widely used. The stress relief method has relatively high requirements on the integrity of the rock mass. It is difficult to ensure the integrity of the core for the broken rock mass, the success rate is low, the test method is complicated, and the co...

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Problems solved by technology

[0003] Technical problem: The purpose of the present invention is to overcome the deficiencies of the existing in-situ stress measurement methods, and provide an in-situ stress measurement device and method based on visual uniform hydraulic fracturing that is simple in structure, easy to operate, and suitable for complex surrounding rock geological conditions. Solve the problem that the traditional hydraulic fracturing ground stress measurement device is limited by the weak and broken rock mass and the rock mass with primary fractures

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