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Equipment and method for long-distance screen pipe completion of directional drilling for underground gas drainage in coal mines

A gas extraction and directional drilling technology, which is applied in mining equipment, gas discharge, and mining fluids, etc., can solve problems such as difficulty in laying down long-distance screen tubes, easy blockage of screen holes, and easy blockage.

Active Publication Date: 2021-08-20
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a coal mine underground gas drainage system for the current underground gas drainage in coal mines. Equipment and method for directional drilling long-distance screen completion

Method used

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  • Equipment and method for long-distance screen pipe completion of directional drilling for underground gas drainage in coal mines
  • Equipment and method for long-distance screen pipe completion of directional drilling for underground gas drainage in coal mines
  • Equipment and method for long-distance screen pipe completion of directional drilling for underground gas drainage in coal mines

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Experimental program
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Effect test

Embodiment

[0042] see figure 1 , a kind of directional drilling and long-distance screen 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 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 rectangular slo...

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Abstract

The invention discloses a long-distance screen tube completion equipment and method for directional drilling for underground gas drainage in coal mines. The invention uses the slotted screen pipe to protect the hole, avoiding the failure of the hole wall caused by the collapse of the hole wall; the directional drilling machine is used to provide sufficient driving power to ensure the long-distance lowering of the slotted screen pipe and the air pipe; the eccentric guide device is used to ensure that the slotted screen pipe Lower the main hole of the directional drilling to the bottom of the hole to avoid entering the branch hole; use the air pipe and the mine air supply pipeline to carry out drilling and slotted screen flushing to ensure that the gas drainage channel remains unobstructed; Mouth sealing, using mine drainage pipelines to achieve high-efficiency gas drainage. This technical method has the advantages of sufficient power for lowering the screen, long lowering distance, unobstructed gas drainage channel, etc., and solves the problems of difficulty in lowering the long-distance screen for directional drilling, easy access to branch holes, and easy blockage of boreholes and screens. The gas drainage effect of directional drilling 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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Patent Type & Authority Patents(China)
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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