Deep-level and high-ground-stress coal uncovering and drilling construction device and method

A technology of high in-situ stress and construction device, applied in drilling equipment and methods, drilling equipment, earthwork drilling, etc., can solve problems such as insufficient preparation in the early stage, delay in construction period, affecting production and construction efficiency, etc., to improve construction efficiency and pumping and drainage. Effect, effect of preventing borehole collapse

Inactive Publication Date: 2017-02-22
HUAINAN MINING IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the drilling construction process, the early preparations are insufficient; during the construction process, if new problems encountered cannot be effectively dealt with, the quality of the entire drilling construction cannot be guaranteed, causing delays in the construction period
In the process of deep horizontal and high ground stress coal mining drilling, due to the high pressure of the rock formation, it is easy to break. The casing can be successfully lowered in place after repeated drilling, which seriously affects the production and construction efficiency

Method used

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  • Deep-level and high-ground-stress coal uncovering and drilling construction device and method
  • Deep-level and high-ground-stress coal uncovering and drilling construction device and method
  • Deep-level and high-ground-stress coal uncovering and drilling construction device and method

Examples

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Effect test

Embodiment 1

[0025] Such as Figure 1-3 Shown, a kind of deep horizontal, high geostress drilling construction device for uncovering coal, comprises drill bit 10, and the center of described drill bit 10 has a through hole, and the front end of described drill bit 10 is provided with the dodge door that can make through hole front end aperture open or close 12. The rear end of the drill bit 10 is connected to the drilling machine through the hollow drill rod 11, and the central hole of the drill rod 11 communicates with the through hole of the drill bit 10 to form a channel for the casing 2 to pass through.

[0026] Preferably, the front end of the drill bit 10 is evenly spaced with a plurality of drill teeth along the circumferential direction; one end of the movable door 12 is hinged to the annular end face of the drill bit 10 , and the front end of the movable door 12 is also provided with drill teeth 121 .

[0027] Preferably, the movable door 12 is a rod-shaped structure, two symmetri...

Embodiment 2

[0031] Such as figure 1 Shown, a kind of deep horizontal, high geostress drilling method for uncovering coal, adopt described construction device to carry out drilling construction, comprising:

[0032] Arrange water supply, air supply, drainage and exhaust pipelines in the roadway or shaft;

[0033] The drill bit 10 is fixedly connected to the drill rod 11, and the drill rod 11 is fixed to the main shaft of the drilling machine;

[0034] Start the drilling rig, start drilling along the predetermined direction, and the drill bit 10 continues to feed until it penetrates the entire coal seam and extends forward for a certain distance. The drilling hole is 10-15 meters deep through the coal seam, preferably 12 meters in this embodiment.

[0035] Put the casing 2 into the center hole of the drill pipe 11, the front end of the casing 2 pushes the movable door 12 on the drill bit 10, and passes through the front end of the drill bit 10; after the front end of the casing 2 reaches t...

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Abstract

The invention belongs to the technical field of coal mine safety production and construction and particularly relates to a deep-level and high-ground-stress coal uncovering and drilling construction device and method. The device comprises a drill bit, wherein a through hole is formed in the center of the drill bit, a movable door capable of opening or closing a front-end hole opening of the through hole is arranged at the front end of the drill bit, the rear end of the drill bit is connected with a drill machine through a hollow drill rod, a central hole of the drill rod is communicated with the through hole of the drill bit to form a channel for a casing to penetrate through. The deep-level and high-ground-stress coal uncovering and drilling construction device utilizes a whole-process casing hole-protecting process, a casing is put down in place before the drill rod is pulled out, drill hole collapse caused by rock breakage is very well prevented, and the construction efficiency of pumping and drainage drilling and a pumping and drainage effect are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety production and construction, and in particular relates to a deep horizontal, high ground stress drilling construction device and method for uncovering coal. Background technique [0002] The construction of coal-excavation drilling is mainly used for pre-extracting coal seam gas in the coal-excavation area, so as to minimize the risk of coal seam outburst in the roadway coal-excavation work. The coal seam gas drainage in the coal-excavation area is an important work to prevent gas outburst during the coal-excavation period, and the quality of the drilling construction directly affects the coal-excavation drainage effect. During the drilling construction process, the preparations in the early stage are insufficient; during the construction process, the new problems encountered cannot be effectively dealt with, which will make the quality of the entire drilling construction unable to be gua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/20
CPCE21B7/20
Inventor 周伟东童碧方有向潘怀义石德洲陈磊岳涛汪峰荣
Owner HUAINAN MINING IND GRP
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