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A drilling method for the well body structure of a micro-L type long-life anti-damage mining well

A well structure and long-life technology, which is applied in boreholes/well components, mining equipment, earthwork drilling, etc., can solve problems such as short life and easy damage, and achieve improved gas drainage, reasonable structural design, and improved Effect of Drilling Service Life

Active Publication Date: 2022-03-22
SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem that conventional vertical mining wells are easy to be damaged and have short service life due to the influence of severe displacement of the roof during the coal mining process, and provides a well body structure and drilling method of a micro L-shaped long-life anti-destructive mining well

Method used

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  • A drilling method for the well body structure of a micro-L type long-life anti-damage mining well
  • A drilling method for the well body structure of a micro-L type long-life anti-damage mining well
  • A drilling method for the well body structure of a micro-L type long-life anti-damage mining well

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Embodiment

[0036] On-site application effect

[0037] (1) Brief introduction of application

[0038] Take the ground directional "micro-L" mining well of Sihe Mine of Shanxi Coal Group as an example. The 5301 working face of this mine mainly mines the 3# coal seam, with a mining height of 6.5m and a full height mining at one time. The geological structure of the working face is relatively simple, which is a monocline structure, on which anticlines and synclines develop, the dip angle of the coal seam is 2-8°, the strike length is 1549.5m, the dip length is 296.3m, and the area is 459116.85m 2 . In order to effectively solve the problem of gas exceeding the limit in the 5301 working face during the coal mining process, two vertical drilling wells were established for underground gas extraction, namely the SHCD13-02 "micro-L" type mining well and the SHCD13-01 ground vertical drilling well.

[0039] The SHCD13-02 "micro-L" well constructed in the 5301 working face is used to study the d...

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Abstract

A well body structure and drilling method of a micro-L-shaped long-life anti-destructive mining well, which belongs to the technical field of ground gas drainage in coal mine mining areas, and can solve the problem that conventional vertical mining wells are easily affected by the severe displacement of the roof during the coal mining process. Problems of damage and short life. In the present invention, the wellhead is moved from above the inner side of the air return lane of the working face to above the coal pillar at a position 3-5 meters outside the air return lane of the working face, and is directed to the inner side of the working face at a position of 80-100 meters above the crack zone of the roof to form a "Micro-L" wellbore structure is divided into three open structures, segmented cementing. In general, the design of the wellbore structure is reasonable, which can greatly improve the stability of the wellbore structure, significantly improve the service life of the drilling and the effect of gas drainage at a relatively low cost.

Description

technical field [0001] The invention belongs to the technical field of ground gas drainage in coal mine mining areas, and in particular relates to a well body structure of a micro-L-shaped long-life anti-destructive mining well and a drilling method thereof. Background technique [0002] The "O-ring" formed after coal mining in the working face is the main channel for mining pressure relief gas flow, and also the main area for pressure relief gas drainage. Conventional mining vertical wells are usually arranged within 40m inside the air return roadway, and are mainly used to drain pressure relief gas during coal mining at the working face. Because the wellbore structure is completely located in the working face, it is severely affected by mining, and the wellbore is easily squeezed and sheared by the violent displacement and deformation of the roof, and it is difficult to keep the wellbore unblocked for a long time. [0003] The current surface drilling in the mining area i...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F7/00E21B49/00
CPCE21F7/00E21B49/00
Inventor 李超靳华贤胡胜勇李国富郭向前白建平李友谊孟召平刘应科周显俊李阳王争毕利丽张文君李磊张奡高强郝国才
Owner SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD