liquid co 2 Phase change multi-point fracture method for antireflection
A fracturing, liquid technology, applied in the field of liquid CO2 phase change multi-point fracturing and anti-reflection, which can solve the problems of increased coal seam permeability, insufficient energy released by single-point fracturing, and small cracks
Active Publication Date: 2018-02-27
SHANXI JINMEI GRP TECH RESEACH INST
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Problems solved by technology
[0007] The present invention solves the current problem of liquid CO 2 The energy released by single-point fracturing is insufficient, the cracks formed by the damage to the coal seam are too small, and the gas permeability of the coal seam does not increase significantly. To provide a liquid CO 2 Phase change multi-point fracturing anti-reflection method
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[0018] Below in conjunction with accompanying drawing, the patent of the present invention is described further.
[0019] Liquid CO 2 Phase change multi-point fracturing and anti-reflection method, the arrangement of drilling holes for fracturing test is as follows: figure 1 As shown, there are multiple liquid CO 2 Fracturing tubes (quantity determined by borehole length), and hole sealer, liquid CO 2 The cracking tube is connected through a conductive lead, and the other end is connected to the detonator outside the test drilling. The hole sealing device is connected to the pressure pump through a high-pressure water pipe. After the connection is completed, the push rod is connected to push the cracking tube and the sealing device to the cracking test. In the borehole, the other end of the push rod is connected and fixed with the drilling rig, and then the hole sealing device is filled with water to seal the hole through the pressure pump, and then the liquid CO in the bor...
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The invention discloses a liquid CO used in coal seam 2 The phase change multi-point fracturing anti-permeability technology mainly solves a series of problems of poor gas permeability of coal seam and difficult gas extraction. The invention includes a cracking test borehole arranged in a coal seam, and liquid CO is arranged in the cracking test borehole 2 Fracture tubes, multiple liquid CO 2 Fracturing tubes are connected in series, in liquid CO 2 Two hole sealers are connected behind the cracking tube, and the liquid CO 2 The fracturing tube and hole sealer are pushed into the test borehole. Liquid CO 2 The cracking tube is connected with a mine detonator arranged outside the test borehole by means of a conductive lead wire. After the above arrangement is completed, the hole is sealed, and the mine detonator is used to detonate multiple and liquid CO 2 The cracking tube is heated so that the CO 2 The liquid is transformed into high-pressure CO in a short time 2 The gas acts on the coal body to generate cracks, thereby improving the efficiency of gas extraction. The present invention also includes the liquid CO 2 The layout distance and time selection of fracturing drilling and drainage drilling.
Description
technical field [0001] The invention relates to a coal seam fracturing and anti-permeability method, specifically a liquid CO 2 Phase change multi-point fracturing antireflection method. Background technique [0002] Coal mines in my country are mostly mines with high gas and low permeability, and liquid CO 2 Phase change fracturing technology is an intrinsically safe and reliable new coal mine anti-reflection technology developed according to the characteristics and needs of coal mines in my country. This technology has carried out some industrial tests in some mines, and the original technology is liquid CO 2 Phase change single point fracturing has the following defects: [0003] (1) Liquid CO 2 The energy released by single-point fracturing is insufficient, the cracks formed by the damage to the coal seam are too small, and the gas permeability of the coal seam does not increase significantly; [0004] (2) Liquid CO 2 The influence range of single-point fracturing ...
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IPC IPC(8): E21B43/26E21B43/16E21F7/00
Inventor 张国亮申晋伟尚玮炜罗华贵赵学良陈备王宁
Owner SHANXI JINMEI GRP TECH RESEACH INST