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Ground L-shaped gas extraction drill hole

A gas extraction and ground technology, which is applied in gas discharge, fluid extraction, directional drilling, etc., can solve the problems of poor extraction effect, high cost, and many holes, so as to improve gas extraction efficiency and drill hole positioning accuracy. , the effect of fast construction

Inactive Publication Date: 2017-05-31
HUABEI MINING GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The distance between vertical wells for surface gas drainage is generally about 100m, and there are many holes, making it difficult to coordinate the relationship between geology and mines; underground high-level gas drainage holes need to be arranged with high-level drilling sites, and the drainage effect is poor during the alternation of drilling sites; underground high-level gas drainage roadway excavation Large amount of work and high cost

Method used

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  • Ground L-shaped gas extraction drill hole
  • Ground L-shaped gas extraction drill hole
  • Ground L-shaped gas extraction drill hole

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specific Embodiment approach

[0017] figure 1 The specific embodiment of the present invention is shown: a ground L-shaped gas drainage borehole, the borehole includes a straight hole section 1, a directional deflection section 2 and an upward section 3, and the straight hole section 1 extends underground to the upper coal seam 4 , the upward section 3 is set in the water-conducting fracture zone of the coal seam roof, the directional deflection section 2 connects the straight hole section 1 and the upward section 3; the straight hole section 1 and the directional deflection section 2 are both lowered into the oil casing, and the upward Section 3 is lowered into the screen pipe as an effective gas drainage section. Upward section 3 includes a main hole 10, and the side wall of the main hole 10 is provided with branch hole sidetracking points 9. There are multiple branch holes 11, the lowest part of the main hole 10 is provided with a drain hole 7 communicating with the underground roadway 6, and the orific...

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Abstract

The invention discloses a ground L-shaped gas extraction drill hole. The drill hole comprises a straight hole section, a directional leads-slanting section and a pitching-up section. The straight hole section is vertically arranged downwards. The pitching-up section is arranged in a water-flowing fractured zone of a coal seam roof. The directional leads-slanting section is connected with the straight hole section and the pitching-up section. The straight hole section and the directional leads-slanting section both extend downwards into a petroleum casing pipe. The pitching-up section extends downwards into a screen pipe to serves as an effective gas extraction section. An L-shaped well group is provided with a main hole, a plurality of branch holes and a tunnel penetrating drain hole, an opening is matched with a ground gas extraction pump station so that continuous extraction can be achieved in the mode that a work face actively releases gas, and the drill hole has the advantages that positioning is precision, the construction speed is high, and the multiple branch holes can be formed.

Description

technical field [0001] The invention relates to the field of coal mining, in particular to an L-shaped gas drainage borehole on the ground. Background technique [0002] The gas drainage during the mining face of high gas, coal and gas outburst coal seams in coal mines generally adopts the method of surface gas drainage vertical shaft, underground high level gas drainage hole or high level gas drainage roadway. The distance between vertical wells for surface gas drainage is generally about 100m, and there are many holes, making it difficult to coordinate the relationship between geology and mines; underground high-level gas drainage holes need to be arranged with high-level drilling sites, and the drainage effect is poor during the alternation of drilling sites; underground high-level gas drainage roadway excavation The amount of work is large and the cost is high. [0003] The purpose of this patent is to replace the surface gas drainage vertical shaft, the underground hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/06E21B43/00E21F7/00
CPCE21B7/06E21B43/00E21F7/00
Inventor 倪建明郑士田韩东亚侯晨杨健李抗抗
Owner HUABEI MINING GRP
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