Gas extraction technology based on combustion initiation and cracking
A technology of gas drainage and fracturing, which is applied in the field of gas drainage technology, can solve the problem of limited gas drainage volume and achieve the effect of convenient operation and high gas drainage efficiency
Active Publication Date: 2021-03-02
CHONGQING UNIV
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[0005] In view of the limitation that the existing carbon dioxide cracker has a small amount of liquid carbon dioxide, which is only enough for coal seam cracking, and the gas extraction in the coal seam is limited, the present invention intends to provide a gas cracking based on combustion detonation Drainage process
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[0018] Below by embodiment and in conjunction with accompanying drawing, the present invention will be further described:
[0019] to combine figure 1 — image 3 As shown, a gas drainage process based on combustion detonation and fracturing includes the following steps:
[0020] Step 1: Add an injection hole at the tail end of the carbon dioxide cracker 4, and connect the injection hole with the high-flow medium-low pressure injection mechanism 5 through the high-pressure mine hose 6, and the large-flow medium-low pressure injection mechanism 5 is connected to the gas source through the pipeline system, and close the shut-off valve on the mine high-pressure hose 6.
[0021] Preferably, the gas source system includes a carbon dioxide liquefaction module 1, a carbon dioxide storage and transportation tank, and a carbon dioxide filling assembly 3, all of which are integrated in the same box to form a gas source system. The gas source has the functions of carbon dioxide liquefa...
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The invention discloses a gas drainage process based on combustion detonation cracking, which includes five steps: an injection hole is added at the tail end of the carbon dioxide cracker, and the injection hole is connected with a large-flow, medium-low pressure injection mechanism, and the large-flow The medium and low pressure injection mechanism is connected with the gas source system, and closes the shut-off valve on the high-pressure hose for mining; pushes the carbon dioxide cracker into the drill hole through the drilling rig and seals the drill hole; uses the detonation control device to burn the carbon dioxide cracker Expansion fracturing; open the stop valve on the high-pressure hose for mining, inject carbon dioxide gas with a pressure of 7-10MPa into the carbon dioxide cracker through the gas source system and a large-flow medium-low pressure injection mechanism, and displace the gas in the coal seam At the same time, gas extraction is carried out through additional gas extraction holes. Using the existing carbon dioxide cracker for combustion and detonation for cracking, and then borrowing the carbon dioxide cracker for gas displacement, the gas extraction efficiency is high.
Description
technical field [0001] The invention belongs to the technical field of coal seam gas extraction, and in particular relates to a gas extraction process based on combustion initiation and fracturing. Background technique [0002] The carbon dioxide cracker uses liquid carbon dioxide to heat and gasify and expand, and quickly releases high-pressure gas to break the coal seam. It solves the defects of high destructiveness and high risk in the pre-cracking of explosive blasting mining in the past, and improves coal mining and mining to a certain extent. The safety of pre-splitting, so it is widely used in coal mine operations. [0003] The principle of carbon dioxide cracking is: carbon dioxide exists in a liquid state when it is lower than 31°C, and starts to gasify when it exceeds 31°C, and the pressure is constantly changing as the temperature changes. Taking advantage of the characteristic of carbon dioxide, a certain amount of liquid carbon dioxide (usually about 1.5kg) is ...
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IPC IPC(8): E21B43/26E21B43/16F42B3/04
CPCE21B43/006E21B43/164E21B43/261F42B3/04
Inventor 张东明王浩李树建杨邦友尹思禹陈嘉祺余北辰高恒楚亚培付博学
Owner CHONGQING UNIV