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Drilling, punching and protecting integrated system and method

A technology of drilling punching and subsystems, which is applied in the direction of drilling equipment and methods, drilling tools, mining fluids, etc., which can solve the problems of coal fragmentation, easy collapse of drilling holes, lack of pertinence, etc., and achieve the effect of ensuring stability

Pending Publication Date: 2022-07-08
CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complex geological conditions of broken and soft coal seams, the main manifestations are broken coal, poor permeability, high gas content and gas pressure, difficult drainage and high treatment costs
Therefore, under the dual effects of gas pressure and ground stress, boreholes are prone to collapse, and the implementation of existing borehole collapse prevention and control technology is lack of pertinence, which greatly reduces the amount of gas drainage and seriously restricts the safe production of coal mines.

Method used

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  • Drilling, punching and protecting integrated system and method
  • Drilling, punching and protecting integrated system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In view of the characteristics of complex geological structure and low permeability of broken and soft coal seams, large drilling deformation, and easy instability of the hole wall under the action of in-situ stress, gas pressure, tectonic stress and other factors, this embodiment provides a drilling punch Protection integrated system, including hydraulic punching tool subsystem and hole protection subsystem.

[0021] The hydraulic punching tool subsystem includes a high pressure water braid 1 , a water tank 2 , an emulsification pump station 3 , a pressure relief valve 4 , a sealed drill pipe 5 , a high pressure hose 6 , a drill bit 8 , a drilling rig 9 and a flow meter 10 .

[0022] The sealed drill rod 5 is a hollow circular tube as a whole. The drill bit 8 is provided with an axial nozzle for ejecting high-pressure water. The drill bit 8 is installed at the head end of the sealed drill rod 5 . The central hole of the drill bit 8 communicates with the inner cavity ...

Embodiment 2

[0028] This embodiment provides an integrated method for drilling, flushing and protection using the system described in Embodiment 1, including the following steps:

[0029] a. Install the system and ground lines and inspect them.

[0030] b. Drilling construction. The drilling rig is transported to the preset position according to the selected location of the construction plan, and the drilling construction starts.

[0031] c. After the drilling is formed, exit the drilling tool, move the power head forward, connect the high-pressure water braid 1, install the special punching bit 8 on the drill pipe, and push the drilling again.

[0032] d. The front end fixing device 11 protrudes from the central hole of the drill bit 8 . The supporting claws are deployed and embedded in the coal seam on the inner wall of the borehole. At the same time, the pocket 7 embedded on the outside of the drill pipe is pushed into the hole in the coal seam with a push rod.

[0033] e. Turn on t...

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Abstract

The invention provides a drilling, punching and protecting integrated system and method. The system comprises a hydraulic punching drilling tool subsystem and a hole protecting subsystem. The hydraulic punching drilling tool subsystem comprises a high-pressure water braid, a water tank, an emulsification pump station, a pressure relief valve, a sealing drill rod, a high-pressure hose, a drill bit, a drilling machine and a flow meter. The hole protection subsystem comprises an annular bag, a front end fixing device, a gas cylinder and a gas injection pipe. The two subsystems can complete drilling, punching and protecting integrated operation in order, can be suitable for broken and soft coal seams, and effectively improve the gas extraction efficiency. The annular bag is controlled to be expanded and contracted through air injection and air exhaust, and active hole protection is achieved. The hole protection system can be recycled and reused in time after being used, and compared with a traditional supporting mode, a large amount of cost can be saved.

Description

technical field [0001] The invention relates to the field of coal mine gas prevention and control, in particular to an integrated system and method for drilling, flushing and protection. Background technique [0002] In recent years, as the mining of coal resources in my country has gradually extended to the depths, disasters, mainly coal and gas outbursts, have occurred frequently. At present, hydraulic punching technology is a more effective measure for gas disaster prevention and control, especially in gas prevention and control in high gas, soft and low permeability coal seams. The main function of this technology is to use high-pressure water jets to punch out certain channels along the coal body in front of the working face of the borehole, thereby increasing the number of macroscopic fractures, creating effective conditions for the penetration enhancement of coal body and gas migration, and further improving the Coal seam gas extraction efficiency. However, due to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/00E21B7/18E21B12/00E21B23/01E21B33/126E21B43/00
CPCE21B7/00E21B7/18E21B12/00E21B23/01E21B33/1208E21B33/126E21B43/006
Inventor 牛心刚马腾飞张永将邹全乐程国建刘涵和树栋赵翼曹建军李思乾陈子涵
Owner CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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