A method of grouting displacement drilling solidification sealing and gas pipeless extraction
A technology of grouting drilling and grouting pipes, which is applied in the fields of drilling equipment and methods, gas discharge, earthwork drilling, etc. It can solve the problems of high sealing requirements, improve strength and support force, and avoid plugging process , cost reduction effect
Active Publication Date: 2017-07-07
CHINA UNIV OF MINING & TECH
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Problems solved by technology
However, the conventional drainage technology needs to place a drainage pipe in the borehole and perform necessary sealing, and the sealing requirements are relatively high, which has always been the focus and difficulty of the technology
Method used
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Embodiment 1
[0026] Example 1, such as figure 1 Shown: Use a drill bit to drill a grouting hole 2 with a depth of 15-20 meters in coal body 1. The diameter of the drill bit is 113mm, and the diameter of the formed grouting hole 2 is 120-126mm. When the hole 2 is formed, a leak ring 3 will be generated. At this time, withdraw the drill, fix the orifice tube 4 with a length of 1.5~2m to the orifice of the grouting hole 2 with resin glue, and the length of the exposed orifice is 10cm~20cm; Change the drill bit to the reaming bit 11, and use the matched high-pressure resistant drill pipe 10, the pressure of the high-pressure water jet 12 sprayed by the reaming bit is 10~15MPa, from the grouting hole 2 When the bottom is lifted, the high-pressure jet 12 is sprayed to ream the hole. The reaming is stopped 0.8-1.5m from the orifice and the drill is withdrawn. Using this technology, the diameter of the grouting hole 2 can be expanded to 3 to 5 times the original diameter; Seal the side of the orifi...
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The invention relates to a grouting displacement type borehole curing sealing and pipeless gas extraction method and belongs to a method for underground coal mine gas extraction. The method includes: constructing a grouting borehole in coal mass with a drilling-rig drilling bit, fixing an orifice pipe to an orifice of the grouting borehole, adopting a high pressure resistant drill rod matched with the orifice pipe to eject high-pressure water jet outwards from the bottom of the grouting borehole for bore chambering, injecting grout into the grouting borehole through a grouting pump, after the grout is solidified thoroughly into rock mass, performing sweep drilling along the grouting borehole, penetrating the borehole sealing section to the preset depth, then stopping drilling, and withdrawing the drilling rig to form an extraction borehole; connecting the orifice pipe into an extraction pipeline to perform gas extraction on the extraction borehole. According to the method, the hollow rock mass formed after sweep drilling is used for replacing a conventional extraction pipe for gas extraction, the area of a gas leakage circle around the borehole is reduced remarkably, strength of the borehole sealing section is enhanced, pipe plugging is no longer needed during gas extraction, cost of gas extraction is lowered greatly, and the whole construction process is simple and fast.
Description
Technical field [0001] The invention relates to a method for gas drainage in underground coal mines, in particular to a method for grouting displacement drilling solidification sealing and pipeless gas drainage. Background technique [0002] Underground gas drainage in coal mines is the main method of controlling gas in high outburst mines in my country. The currently used gas drainage methods have some necessary steps, such as drilling, plugging pipes, and sealing holes. After the hole is drilled, a fracture zone, a plastic zone, an elastic zone and a stress zone of the original rock are formed in sequence around the hole. The coal rock in the broken zone is broken and cracks are developed. It is the main channel for gas leakage and escape during gas drainage. Therefore, the broken zone is also called a leak ring. The area of the leak ring is related to the ground stress, the sealing support force and the coal Rock strength is related, it increases with the increase of in-sit...
Claims
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IPC IPC(8): E21F7/00E21B7/28E21B7/18E21B33/13
CPCE21B7/18E21B7/28E21B33/13E21F7/00
Inventor 林柏泉宋吴兵郝志勇孙炜浩万元李博洋
Owner CHINA UNIV OF MINING & TECH