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Method and device for improving coal-rock mass fracturing effect by high and low temperature cycling

A technology of high and low temperature circulation, coal and rock mass, applied in safety devices, mining fluids, earthwork drilling and mining, etc., can solve problems such as high cost and restriction of natural gas mining efficiency, achieve low cost, high fracturing effect, and cost saving Effect

Pending Publication Date: 2017-12-08
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above methods can have a certain cracking effect on the coal and rock mass, and further achieve the purpose of increasing the permeability of the coal mass, the cost of the above methods is relatively high, and there are certain restrictions on the extraction efficiency of natural gas

Method used

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  • Method and device for improving coal-rock mass fracturing effect by high and low temperature cycling
  • Method and device for improving coal-rock mass fracturing effect by high and low temperature cycling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] A device that utilizes high and low temperature cycles to improve the cracking effect of coal and rock masses. The structure diagram is shown in figure 1 , The device includes a refrigeration cycle device, a coal and rock body loading device, a hydraulic system, a temperature control system, an acoustic emission system and a data acquisition and processing system;

[0060] The refrigeration cycle device includes a liquid nitrogen output tank 9, a first pressure regulating valve 11, an output tank pressure gauge 10, a liquid nitrogen storage tank 12, a second pressure regulating valve 14, a storage tank pressure gauge 13, and a liquid nitrogen preparation device 15. ;

[0061] The coal and rock mass bearing device includes an upper pressure cap 1, an upper pressure head 2, a sample cylinder 4, a lower pressure cap 5, a lower pressure head 8 and a sample cylinder base 6;

[0062] The hydraulic system includes a hydraulic device 16, a confining pressure gauge 17, and a confining ...

Embodiment 2

[0102] A device for improving the cracking effect of coal and rock mass by using high and low temperature cycles is the same as in Example 1.

[0103] A method for improving the cracking effect of coal and rock mass by using high and low temperature cycles, using the above device, specifically includes the following steps:

[0104] Step 1: Prepare and assemble coal and rock sample 23

[0105] Take a Φ100mm×100mm coal and rock sample 23 from the coal and rock with a coring machine, and penetrate a through hole in the center of the coal and rock sample 23, and load the coal and rock sample 23 with the through hole into the sample cylinder 4. seal;

[0106] Step 2: Apply confining pressure to coal and rock mass sample 23

[0107] Open the confining pressure regulating valve 18 of the hydraulic device 16 in the hydraulic system, and continuously inject hydraulic oil into the sample cylinder 4 to make the confining pressure of the coal and rock sample 23 reach 15MPa, and close the confining...

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Abstract

The invention belongs to the technical field of coal mine safety production and discloses a method and a device for improving a coal-rock mass fracturing effect by high and low temperature cycling. The device comprises a refrigeration cycling device, a coal-rock mass loading device, a hydraulic system, a temperature control system, an acoustic emission system and a data acquiring and processing system. The method with the device involved includes: preparing a coal-rock mass sample, assembling, applying a confining pressure to the coal-rock mass sample, collecting acoustic emission signals, applying a high-temperature thermal load to the coal-rock mass sample, refrigerating the coal-rock mass sample in a high-temperature environment, collecting signals, and analytically processing to obtain fracturing characteristics and crack propagation rules of the coal-rock mass under a high and low temperature cycling condition. By high and low temperature jump for realizing coal-rock mass fracturing, the referable method is provided for improving natural gas exploitation efficiency.

Description

Technical field [0001] The invention belongs to the technical field of coal mine safety production, and in particular relates to a device and method for improving the cracking effect of coal and rock mass by using high and low temperature cycles. Background technique [0002] With the gradual development of coal mining resources in our country, the gas content in coal gradually increases, coal permeability and gas desorption capacity decrease, resulting in a sharp increase in the difficulty of gas drainage, and the accumulation of coalbed methane in coal seams seriously affects coal mine safety production. [0003] In order to properly drain gas, conventional methods such as drilling, heat injection, and hydraulic fracturing are often used. The method of drilling can increase the gas drainage volume to a certain extent by increasing the number and density of drilling holes in the coal seam; adopting heat injection measures can enhance the permeability of coal. The hydraulic fractu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21F7/00
CPCE21B43/26E21F7/00
Inventor 马玉林程瑶刘杰马凯张永利
Owner LIAONING TECHNICAL UNIVERSITY