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

A hydraulic fracturing and measuring device technology, applied in hydraulic/pneumatic force measurement, etc., can solve problems such as constraints, achieve the effects of expanding the scope of application, realizing visualization, and improving the scope of application

Inactive Publication Date: 2016-07-13
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 ...

Method used

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

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Embodiment 1

[0037] Embodiment 1: A kind of ground stress testing method based on the visualized uniformly distributed hydraulic fracturing ground stress measuring device of the present invention consists of the following steps:

[0038] 1. Select relatively complete surrounding rock mass for measurement;

[0039] 2. Construction drilling, the drilling requirements are as follows: ①The diameter of the construction drill bit should be within the range of 75mm-100mm to ensure that the ground stress measurement device matches the surrounding rock of the drilling hole; ②The length of the drilling hole should reach 3-5 times the radius of the roadway, Ensure that the measured ground stress is the stress of the original rock ③ The drilling should be constructed as far as possible to the roof to facilitate the expansion of cracks;

[0040] 3. For equipment installation, first open the static pressure water inlet pipe (4) to allow the static pressure water to enter the accumulator (2). Afterwards...

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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...

Claims

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Application Information

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IPC IPC(8): G01L1/02
CPCG01L1/02
Inventor 张少华程亮刘伟张明磊刘建郭文豪
Owner CHINA UNIV OF MINING & TECH
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