High-pressure nitrogen blast cracking permeability increase experimental device and method

A technology of high-pressure nitrogen and experimental equipment, which is applied in the direction of earthwork drilling, mining fluid, wellbore/well components, etc., can solve the problems of not considering the effect of nitrogen volume fracturing, and achieve wide practicability, strong stability, Easy to use and convenient effects

Active Publication Date: 2015-11-18
CHINA UNIV OF MINING & TECH
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Problems solved by technology

The existing experimental research is mainly about the cracking effect of high-pressure nitrogen blasting under different pressures, and does not consider the effect of nitrogen volume on the cracking effect

Method used

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  • High-pressure nitrogen blast cracking permeability increase experimental device and method

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Embodiment 1

[0016] Embodiment 1: taking the cement test piece as the example of the blasted medium 17, the specific method of use of the experimental device of the present invention is:

[0017] 1. Use stones, cement, and sand as model materials and mix them with each other to produce a total of 5 cubic cement specimens 17 with a compressive strength of 1.97MPa and a tensile strength of 0.19MPa. The size of the cement specimen 17 is just right Can be placed in the triaxial pressure chamber 18.

[0018] 2. Use cement, resin and other sealing materials to solidify one end of the air guide hose in the air explosion hole outside the triaxial pressure chamber 18, and connect the other end of the air guide hose to the high-pressure air bag through a plug-in connection.

[0019] 3. The triaxial pressure testing machine 19 performs stress loading on the cement specimen 17 in both horizontal and vertical directions. When the axial pressure of the cement specimen 17 is 1.0 MPa and the confining pre...

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Abstract

The invention provides a high-pressure nitrogen blast cracking permeability increase experimental device and method and belongs to coal bed gas blast cracking permeability increase experimental devices and methods. The device comprises a nitrogen steel cylinder, an air compressor, a gas booster pump, a high-pressure gas bag and a three-axis pressure experimental machine. The gas booster pump is connected with the air compressor and the nitrogen steel cylinder through hoses. A pressure meter and a safety valve are arranged on the high-pressure gas bag. One end of the high-pressure gas bag is connected with the gas booster pump through a stainless steel gas guide tube, and the other end of the high-pressure gas bag is connected with a three-axis pressure chamber filled with a blasted medium through a gas guide hose. A gas control valve is arranged on the gas guide hose between the high-pressure gas bag and the three-axis pressure chamber. The method includes the steps that nitrogen is generated through the nitrogen steel cylinder and boosted to be stored in the high-pressure gas bag, when the pressure in the gas bag reaches the standard, the gas control valve is opened, the high-pressure nitrogen is instantaneously released, the loaded blasted medium is cracked, and blast cracking of nitrogen of different pressures and different volumes is achieved through high-pressure bags of different volumes. The device is easy and convenient to use, and the blast cracking effect of high-pressure nitrogen at different pressures and different volumes is achieved.

Description

technical field [0001] The invention relates to a coal seam gas blasting cracking anti-reflection experimental device and method, in particular to a high-pressure nitrogen blasting cracking anti-reflection experimental device and method. Background technique [0002] For a single low-permeability coal seam, in addition to adopting hydraulic measures and deep hole pre-splitting blasting measures to increase the permeability of the coal seam, a high-pressure gas blasting fracture enhancement method has been developed in recent years. The anti-reflection measures of high-pressure gas blasting have no spark, high safety and controllable pressure. [0003] At present, the application of high-pressure nitrogen blasting anti-reflection technology is still in its infancy, especially the mechanism of nitrogen gas anti-reflection has not yet been systematically studied. Existing experimental studies are mainly about the cracking effect of high-pressure nitrogen blasting under differe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26
Inventor 王海锋郭帅飞王伟赵旭王海洋孙扬
Owner CHINA UNIV OF MINING & TECH
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