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Method for testing crustal stress of coal rock mass by hydraulic fracturing

A technology of hydraulic fracturing and ground stress, which is applied in the measurement of hydraulic/pneumatic force, etc., can solve the problems of complex equipment, inconvenient transportation, and inconvenient measurement of ground stress, so as to improve efficiency, facilitate connection and operation, and facilitate handling Effect

Inactive Publication Date: 2019-02-19
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0005] In view of the above analysis, the present invention aims to provide a method for testing the ground stress of coal and rock mass by hydraulic fracturing to solve the existing problems of inconvenient ground stress measurement, inconvenient transportation, and overly complicated equipment

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  • Method for testing crustal stress of coal rock mass by hydraulic fracturing
  • Method for testing crustal stress of coal rock mass by hydraulic fracturing
  • Method for testing crustal stress of coal rock mass by hydraulic fracturing

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Embodiment Construction

[0043] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and together with the embodiments of the present invention are used to explain the principle of the present invention and are not intended to limit the scope of the present invention.

[0044] In order to make the in-situ stress testing equipment suitable for downhole, it has the advantages of convenient transportation, fast installation, stable performance, convenient, accurate, safe and stable measurement. Such as figure 1 As shown, the embodiment of the present invention provides a device for testing the ground stress of coal and rock mass by hydraulic fracturing. The test device includes: an air pump 3, a test system 6, a data recorder 7, a five-way valve 4, and a packer 10 The air pump 3 pumps the high-pressure water into the five-way valve 4, and the five-way valve 4 p...

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Abstract

The invention relates to a method for testing a crustal stress of a coal rock mass by hydraulic fracturing, and belongs to the technical field of crustal stress measurement. The method solves the problems that an existing method for measuring the crustal stress is inconvenient in measurement and transportation, and the device is too complex. The method comprises the following steps: selecting a testing section of a core to be tested; connecting with a testing device, and performing leak detection testing on the testing device; sending a packer of the testing device to the testing section, connecting with a power source and a hydraulic medium of the testing device; pressurizing the packer to expand the packer; starting a pressure sensor to start monitoring the pressure in real time, and recording an initial water pressure of the testing section; pumping high-pressure liquid into the testing section to fracture the testing section; stopping pumping the high-pressure liquid until the crack generated by the fracturing of the testing section is closed; repeating S5 and S6 for at least three times, and recording the pressure of each testing section detected by the pressure sensor when fracturing; and calculating a crustal stress according to a stress relationship and a force relation when the crack is generated.

Description

technical field [0001] The invention relates to the technical field of geostress measurement, in particular to a method for testing the geostress of coal and rock mass by hydraulic fracturing. Background technique [0002] In-situ stress is the natural stress that exists in the formation without engineering disturbance, and is the fundamental force that causes deformation and destruction of underground engineering. In-situ stress testing is an important parameter for engineering rock mass stability analysis and engineering design, and has great guiding significance for underground rock mass analysis and engineering construction. The method of testing ground stress by hydraulic fracturing is suitable for the initial exploration stage of underground engineering. [0003] Due to the narrow downhole space, the main difficulty in testing ground stress in downhole hydraulic fracturing lies in the size, installation and transportation of instruments and equipment. Traditional hyd...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/02
CPCG01L1/02
Inventor 姚强岭杨朴闫凯李学华
Owner CHINA UNIV OF MINING & TECH
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