Equipment and method for hole completion of long distance screen pipe by directional drilling for underground gas extraction in coal mine

A technology of gas drainage and directional drilling, which is applied in the direction of gas discharge, mining equipment, mining fluid, etc. It can solve the problems of difficulty in lowering long-distance screens, easy blockage of screen holes, and easy blockage, so as to improve gas pumping. mining effect, long drop-down distance, and high drop-down efficiency

Active Publication Date: 2019-11-19
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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Problems solved by technology

[0009] The purpose of the present invention is to provide a coal mine underground gas drainage system for the current

Method used

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  • Equipment and method for hole completion of long distance screen pipe by directional drilling for underground gas extraction in coal mine
  • Equipment and method for hole completion of long distance screen pipe by directional drilling for underground gas extraction in coal mine
  • Equipment and method for hole completion of long distance screen pipe by directional drilling for underground gas extraction in coal mine

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Embodiment

[0042] see figure 1 , a kind of directional drilling and long-distance screen pipe completion equipment for underground gas drainage in coal mines, including a directional drilling rig 1 with the function of lowering the pipeline, a slotted screen pipe 2, an eccentric guide device 3, an air pipe 4, and a first stop valve 5 , pressure air hose 6, mine air supply pipeline 7, sealing continuous pumping device 8, drainage hose 9, mine gas drainage pipeline 10, etc., wherein:

[0043]The directional drilling rig 1 with the pipeline lowering function is used for the construction of the directional drilling 11 for gas drainage, and the lowering of the slotted screen pipe 2 and the air pipe 4 .

[0044] The slotted screen pipe 2 is connected with the eccentric guide device 3 and lowered into the directional borehole 11 to ensure a smooth gas drainage channel. It is made of PVC material, the inner wall and outer wall are flat, the two ends are connected by threads, and there are recta...

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Abstract

The invention discloses equipment and a method for hole completion of long distance screen pipe by directional drilling for underground gas extraction in coal mine. According to the equipment and themethod, a seam cutting screen pipe is used for protecting a hole, so that drilling failure caused by hole wall collapse is avoided; enough lower pipe power is provided by using a directional drillingmachine, and long-distance lowering of the seam cutting screen pipe and an air pipe is ensured; the seam cutting screen pipe is ensured to be lowered to the bottom of the hole along the directional drilling main hole by utilizing an eccentric guide device, so that the seam cutting screen pipe is prevented from entering the branch hole; the air pipe and the mine air supply pipeline are used for drilling and flushing the seam cutting screen pipe, and it is ensured that the gas extraction channel is kept smooth; and hole opening sealing is carried out by utilizing a sealing and connecting pumpingdevice, and high-efficiency gas extraction is realized by adopting a mine extraction pipeline. The technical method has the advantages of being sufficient in power of lowering the screen pipe, long in lowering distance, smooth in gas extraction channel, the problems that the directional drilling long-distance screen pipe is difficult to put down, easily enters the branch hole, and the drilling and the screen pipe are easy to block are solved, and the directional drilling gas extraction effect is improved.

Description

technical field [0001] The invention relates to a screen tube completion equipment and method, belonging to the technical field of coal mining, in particular to a coal mine underground gas drainage directional drilling long-distance screen tube completion equipment and method. Background technique [0002] At present, gas drainage and utilization are mainly based on underground mining of coal mines, and boreholes are mainly used as gas drainage channels. Near-horizontal directional drilling in underground coal mines has the advantages of long hole depth, high trajectory control accuracy, one hole for multiple purposes, and centralized and advanced gas drainage. [0003] Although near-horizontal directional drilling in underground coal mines solves the problem of precise measurement and control of drilling trajectories, at present, open hole completion methods are mainly used, which affects the gas drainage effect, which is mainly reflected in the following aspects: [0004]...

Claims

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Application Information

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IPC IPC(8): E21B43/08E21B43/10E21B37/08E21B23/00E21B43/00E21F7/00
CPCE21B23/00E21B37/08E21B43/006E21B43/086E21B43/10E21F7/00
Inventor 方俊李泉新褚志伟刘智刘飞许超刘建林陈盼李渊
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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