Liquid nitrogen ultralow temperature and phase change fracturing effect similar simulation experiment device and experiment method

A technology similar to simulation experiments and experimental methods, applied in the field of liquid nitrogen ultra-low temperature and phase change fracturing effect similar simulation experimental devices, to achieve obvious effects and be conducive to the effect of efficient gas drainage

Pending Publication Date: 2022-06-21
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most laboratory experiments can only observe the surface cracks, internal pores, and mechanical properties of coal samples before and after liquid nitrogen freezing and thawing, and liquid nitrogen injection, and monitor the deformation and damage characteristics of coal during the whole process of liquid nitrogen freezing and thawing.
At present, there are few equipment related to similar simulation experiments on the effects of liquid nitrogen ultra-low temperature and phase change fracturing on coal seams and the impact on overlying rock formations.

Method used

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  • Liquid nitrogen ultralow temperature and phase change fracturing effect similar simulation experiment device and experiment method
  • Liquid nitrogen ultralow temperature and phase change fracturing effect similar simulation experiment device and experiment method
  • Liquid nitrogen ultralow temperature and phase change fracturing effect similar simulation experiment device and experiment method

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Embodiment 1

[0043] A liquid nitrogen ultra-low temperature and phase transition cracking effect similar simulation experimental device and experimental method are characterized in that: a two-dimensional similar simulation test bench, including a liquid nitrogen supply system, a similar material mixing system, a stress monitoring system, a microseismic monitoring system, and a borehole imaging system and XTDIC monitoring system.

[0044] The two-dimensional similar simulation test bench includes a test bench base 42, the test bench base 42 is an I-shaped, and two similar test bench supports 41 are welded on the test bench base 42. The test bench supports 41 are respectively located at both ends of the test bench base 42, the two similar test bench supports 41 have a certain width, and the bottom beams 36 are welded to the lower ends of the two similar test bench supports 41. The upper end of the similar test bench support 41 is detachably connected with two baffles 8, and the two baffles ...

Embodiment 2

[0055] The working process of the present invention is:

[0056] First, assemble the two-dimensional similar simulation experimental bench, pass the bolts through the bracket bolt holes 7 of the similar experimental bench bracket 41 and the baffle bolt holes 801 of the baffle plate 8, then tighten the nuts 9, and the left and right similar experimental bench brackets 41 At the same time, the baffles 8 are installed on the similar experimental bench supports 41, the two baffles 8 are symmetrical in front and back, and at the same time, the similar experimental bench supports 41 have a width, and the two baffles 8 are symmetrical with the left and right similar experimental bench supports 41 and 41. The bottom beam 36 forms an uncapped cube space, and the bottom wireless pressure sensors 40 are placed in series on the bottom beam 36 of the bottom layer, and A4 paper is laid on the bottom wireless pressure sensor 40 to prevent the upper layer material from falling from the gap. A...

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Abstract

The invention belongs to the technical field of liquid nitrogen ultralow temperature phase change fracturing, and particularly relates to a liquid nitrogen ultralow temperature and phase change fracturing effect similar simulation experiment device and method, and the device comprises a two-dimensional similar simulation experiment table which comprises a liquid nitrogen supply system, a similar material mixing system, a stress monitoring system, a microseismic monitoring system, a drilling imaging system and an XTDIC monitoring system; the liquid nitrogen ultralow temperature and phase change fracturing effect similar simulation experiment device and the experiment method have the beneficial effects that physical similar simulation is utilized to simulate coal seam liquid nitrogen anti-reflection, the liquid nitrogen ultralow temperature and phase change fracturing effect and displacement and deformation of an overlying rock stratum are observed, meanwhile, the stress change condition is monitored through the pressure sensor, and the experiment result is more accurate. And the fracture development and evolution law is observed through the preset drill hole.

Description

technical field [0001] The invention belongs to the technical field of liquid nitrogen ultra-low temperature phase transition cracking, and particularly relates to a liquid nitrogen ultra-low temperature and phase transition cracking effect similar simulation experiment device and experimental method. Background technique [0002] First of all, my country is rich in coal resources, and the production and consumption of coal also ranks in the forefront of the world. Coal, as my country's basic energy, will account for 56.8% of my country's primary energy consumption in 2020. The coal seam gas content is closely related to the mining depth. With the rapid increase of the mining depth, the coal seam gas content and gushing volume gradually increase. According to statistics, nearly half of the key coal mines in the country are high gas mines or gas outburst mines. Second, coal is a natural geological body with defective structures such as micro-cracks, pores and low strength. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/06G01N3/60G01N15/08G01V1/28G01N33/22
CPCG01N3/60G01N3/068G01N3/06G01N15/08G01V1/288G01N33/222G01N2203/0228G01N2203/0647G01N2203/0676G01N2203/0682
Inventor 林海飞罗荣卫李树刚刘思博白杨李博涛李莉秦雷魏宗勇丁洋
Owner XIAN UNIV OF SCI & TECH
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