Automatic water absorption sealing-hole plugging device and method for near-horizontal coal seam gas extraction drill hole
A technology for coal seam gas extraction and drilling, which is used in gas discharge, safety devices, sealing/packing, etc., and can solve the problem that the grouting pressure is difficult to achieve, the strength of the polyurethane grouting plug is low, and the sealing effect is difficult to achieve an ideal state. and other problems, to achieve the effect of improving compactness, simple sealing operation, and ensuring the sealing effect.
Active Publication Date: 2019-06-21
CCTEG SHENYANG RES INST
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Problems solved by technology
This method can be used for the sealing of near-horizontal drilling, but it is difficult to control the expansion time of the polyurethane sealing bag, the strength of the polyurethane grout stopper is low, the grouting pressure is difficult to reach 0.5MPa, and the sealing effect is difficult to achieve the ideal state
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[0050] This embodiment proposes a method for automatically absorbing water to plug and seal holes in gas drainage boreholes in near-horizontal coal seams, using the automatic water-absorbing and plugging and sealing devices for gas drainage in near-horizontal coal seams as proposed in Example 1, which is characterized in that it includes Follow the steps below:
[0051] Step 1. Drill holes in the coal seam to form boreholes. After the drilling construction is completed, use the compressed air device to blow away the accumulated water and cinders in the holes, and place the automatic water-absorbing and sealing device for the near-horizontal coal seam gas drainage drilling. inside the borehole;
[0052] Step 2. Inject expansive cement slurry into the grouting space through the grouting pipe 5. Initial injection, the injection speed of the expansive cement slurry is less than 10L / min, and the injection pressure is less than 0.2Mpa;
[0053] Step 3. The water-absorbent resin mat...
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The invention relates to the technical field of rock wall hole sealing, and discloses an automatic water absorption sealing-hole plugging device for a near-horizontal coal seam gas extraction drill hole. The device comprises a connecting pipe, a front-section grout stopping plug, a rear-section grout stopping plug, a grouting pipe and an exhaust pipe, a grouting space for injecting hole sealing grout is formed between the front-section grout stopping plug and the rear-section grout stopping plug, and inner side ports of a grouting pipe and an exhaust pipe penetrate through the rear-section grout stopping plug and extend into the grouting space; each of the front-section grout stopping plug and the rear-section grout stopping plug comprises an inner side baffle facing one side of the grouting space, an outer side baffle deviating from one side of the grouting space, and water swelling rubber and water absorption resin which are packed between the inner side baffle and the outer side baffle; and the shape and the area of the outer side baffle and the inner side baffle are matched with the cross section of the drill hole, the outer side baffle and the inner side baffle are provided with mounting holes, and the outer side baffle and the inner side baffle fixedly sleeve the outside of the connecting pipe through the mounting holes respectively. The automatic water absorption sealing-hole plugging method for the near-horizontal coal seam gas extraction drill hole is provided.
Description
technical field [0001] The invention relates to the field of hole sealing in rock walls, in particular to a device and method for automatically absorbing water and sealing holes in drilling holes for gas drainage in near-horizontal coal seams. Background technique [0002] The quality of the sealing hole directly affects the gas drainage effect. Theoretically, the gas concentration of well-sealed drilling holes should be 70-90%. The desired effect has not been achieved, especially for near-horizontal coal seams, where the problem of gas leakage in boreholes is the most prominent. [0003] The current sealing process in my country mainly has the following three methods: contact sealing (glue sealing, mechanical sealing device sealing, capsule sealing device sealing, polyurethane chemical organic material sealing), permeable sealing ( Cement and other non-metallic materials such as grouting and sealing), combined sealing (two plugs and one injection sealing). [0004] The mec...
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IPC IPC(8): E21B33/13E21B33/127E21F7/00
Inventor 杨宏伟韩兵高宏钱志良刘和平
Owner CCTEG SHENYANG RES INST
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