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A design method and construction technology of a "human"-shaped ground well in a coal mining area

A design method and mining area technology, applied in the direction of drilling equipment and methods, mining equipment, drilling equipment, etc., can solve the problems of small gas area, small drainage range of construction vertical wells in mining area, and large number of construction wells, etc. Achieve the effects of reducing drilling costs, facilitating centralized management, and improving the recovery rate of gas resources

Active Publication Date: 2021-12-21
CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual production, it is found that the vertical well drainage in the mining area is small, the number of construction wells is large, the investment is large, and the connection requirements are strict, so it is impossible to achieve efficient extraction of coalbed methane
[0004] Surface wells in the prior art include vertical surface wells and L-shaped surface wells. However, the gas extraction area of ​​vertical surface wells is small, and L-shaped surface wells have blank areas for gas extraction in arc-shaped wells.

Method used

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  • A design method and construction technology of a "human"-shaped ground well in a coal mining area
  • A design method and construction technology of a "human"-shaped ground well in a coal mining area
  • A design method and construction technology of a "human"-shaped ground well in a coal mining area

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Embodiment 1

[0073] A method for designing a "human"-shaped surface well in a coal mining area. The surface well includes a vertical well section 1 and a horizontal well section 3, and the vertical well section 1 and the horizontal well section 3 are connected through an arc-shaped well section 2; The well location is determined by the air return roadway and the overlying strata. The distance a between the well position and the production stop line is 150m to 200m. The roadway distance b is 1 / 5 of the inclination length of the coal mining face, in which the key layer refers to the overlying strata with strength ≥ 60MPa, stiffness ≥ 25Gpa, and thickness ≥ 6m; the well depth of vertical well section 1 is below the coal seam floor and above the fracture zone, The lateral casing 6 that is easy to penetrate laterally is set at the depth position of the vertical well section from the surface wellhead h3; through the drilling of the vertical well section 1, the actual coal seam burial depth, coal ...

Embodiment 2

[0078] A construction technique for a "man"-shaped surface well in a coal mining area, first drilling a vertical well section 1, then drilling an arc-shaped well section 2, and finally drilling a horizontal well section 3, comprising the following steps:

[0079] S1 Determining the well location: determine the well location according to the stop production line, the return airway and the overlying strata. The well position is located at the intersection of the bottom of the overlying strata key layer and the elliptical zone of the overlying strata fissure, and is located at a distance of 150m to 200m from the stop production line a within the area.

[0080] S2 drilling vertical section 1:

[0081] S2.1 First opening: Drill to 10m below the topsoil layer, next casing 4 cementing;

[0082] S2.2 second opening:

[0083] S2.21 Drilling to 5-10m above the bottom of the bent subsidence zone of the overlying rock;

[0084] S2.22 Run the second casing 5 for cementing, and set the l...

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Abstract

The invention relates to a design method and construction technology of a "human" type surface well in a coal mining area, belonging to the technical field of coal mine gas drainage. The surface well includes a vertical well section and a horizontal well section, and the vertical well section and the horizontal well section pass through The well section is connected; the well position is located in the coal seam area, close to the side of the return airway, and the distance from the stop line is a; the well depth of the vertical well section is below the coal seam floor and above the fracture zone; the distance between the vertical well section and the ground wellhead is h3 The lateral casing is set at the depth of the well; the horizontal well section is located at the upper part of the fractured zone close to the side of the curved subsidence zone; the arc-shaped well section is connected with the vertical well section through the lateral casing; during construction, the vertical well section is constructed first, and then the Arc-shaped well section, and finally construct the horizontal well section. The invention realizes the purpose of arranging two well types of L-shaped surface well and vertical well in the mining area in a single well site, improves the recovery rate of gas resources, and can effectively guarantee the gas in the upper corner of the coal mining face and the return airway The concentration does not exceed the limit, which is conducive to the centralized management of gas drainage.

Description

technical field [0001] The invention belongs to the technical field of gas drainage in coal mines, and relates to a design method and construction technology of a "man"-shaped ground well in a coal mining area, in particular to a method for controlling gas in a ground well in a mining area. Background technique [0002] Coal bed gas is commonly known as "gas", and its main component is CH4 (methane). It is an unconventional natural gas associated with coal and stored in coal seams in an adsorbed state. The main component is methane. is good fuel. When the air concentration of coalbed methane reaches a certain value, it will explode when it encounters an open flame, which is the root cause of coal mine gas explosion accidents. Therefore, controlling coalbed methane is an important means to reduce accidents. Coalbed methane is directly discharged into the atmosphere, which is very destructive to the atmosphere. Therefore, if coalbed methane is exploited before coal mining, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D1/06E21D8/00E21B7/20
CPCE21D1/06E21D8/00E21B7/20
Inventor 孙海涛付军辉李日富刘延保马正恒姚峰王波张玉明孙锐曹偈
Owner CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD