Coal mine underground directional hole close-range multi-branch sidetrack drilling tool and drilling method

A directional hole, close-range technology, applied in directional drilling, earth-moving drilling, wellbore/well components, etc., can solve problems such as large spacing between branch holes, inability to run branch holes, and low sidetracking branch efficiency. Collapse failure, ensure the effect of disaster prevention and control, and avoid the effect of the blank zone of disaster prevention and control

Active Publication Date: 2021-07-02
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the above-mentioned problems, the present invention proposes a short-distance multi-branch sidetracking drilling tool and drilling method for directional holes in underground coal mines, which solves the problem that branch points need to be reserved for directional holes for disaster prevention and control in underground coal mines, the distance between branch holes is large, and sidetracking branches Problems such as low efficiency, branch holes cannot be lowered into screen protection holes, etc.

Method used

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  • Coal mine underground directional hole close-range multi-branch sidetrack drilling tool and drilling method
  • Coal mine underground directional hole close-range multi-branch sidetrack drilling tool and drilling method
  • Coal mine underground directional hole close-range multi-branch sidetrack drilling tool and drilling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] This embodiment discloses a coal mine underground directional hole short-distance multi-branch sidetracking drilling tool. The drilling tool includes a guiding drilling tool 1 and a flexible branch drilling tool 2 that can be inserted into the guiding drilling tool 1. Specifically, the guiding drilling tool The inner diameter of 1 matches the outer diameter of the flexible branch drilling tool 2.

[0062] A positioning groove 111 is arranged on the inner wall of the guide drilling tool 1, such as figure 2 As shown, the pipe wall of the guide sleeve 12 is provided with a guide opening 121 for the flexible branch drilling tool 2 to protrude, such as image 3 shown.

[0063] The pilot drill 1 includes an outer casing 11 and a guiding casing 12 connected with the outer casing 11 , and the diameters of inner holes of the outer casing 11 and the guiding casing 12 are the same. Preferably, the outer sleeve 11 and the guide sleeve 12 are connected through a hexagonal male jo...

Embodiment 2

[0074] In order to realize the screen pipe completion of the branch hole 5 and avoid the collapse and failure of the branch hole, the screen pipe completion drilling tool 3 is also provided on the basis of the drilling tool in the first embodiment.

[0075] Such as Figure 8 As shown, the screen pipe completion drilling tool 3 of this embodiment includes a screen pipe 31 and a pushing nipple 32 connected to the screen pipe 31. The pushing nipple 32 is provided with a passage for gas and gas in the branch hole 5. circulation. A valve body 322 is arranged on the channel, and the high-pressure flushing fluid first pushes the valve body 33 to close the flow path, and then the flushing fluid pushes the entire screen completion drilling tool 3 into the branch hole 5 .

[0076] In this example, if Figure 9 As shown, the pushing nipple 32 includes a housing 321 , a valve body 322 and a third elastic member 323 , and the third elastic member 323 is specifically a spring. The valve ...

Embodiment 3

[0080] This embodiment discloses a short-distance multi-branch sidetracking method for a directional hole in a coal mine. Specifically, the drilling tool described in Embodiment 1 is used to drill branch holes, and specifically includes the following steps:

[0081] Step 1: Drill into the main hole. Specifically, after constructing the main hole 4 with a conventional directional drilling tool, exit the directional drilling tool in the hole; then run the directional drilling tool 1 from the main hole to the designed sidetrack branch point, , connecting the guide sleeve 12 and the outer sleeve 11 in turn;

[0082] Step 2, adjusting the direction of the guide port 121: after adjusting the direction of the guide port 121 of the guide drill 1 to be consistent with the direction of the designed sidetrack branch, lock the guide drill 1. Specifically, during adjustment, the pilot drilling tool 1 is slowly rotated, and since the orientation of the pin 26 is the same as that of the guid...

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Abstract

The invention discloses a coal mine underground directional hole close-range multi-branch sidetrack drilling tool and a drilling method. The drilling tool comprises a guide drilling tool and a flexible branch drilling tool capable of being inserted into the guide drilling tool; a section of positioning groove is formed in the inner wall of the guide drilling tool, and a guide opening allowing the flexible branch drilling tool to stretch out is formed in the pipe wall of a guide sleeve; the flexible branch drilling tool comprises an inner drill rod, a positioning connector, a continuous pipe, a bent connector and a spray head which are sequentially connected; and the positioning connector comprises a connector pipe body, a positioning key arranged in the radial direction of the connector pipe body, and a positioning key adjusting piece used for adjusting the radial position of the positioning key. By adjusting the posture of the guide drilling tool, the branch opening direction can be accurately controlled, and under guiding of the guide drilling tool, sidetrack drilling branch can be conducted in any direction in the radial direction of a drill hole; and the number and the distance of branch holes are not affected by reserved branch points, all the branch holes are effectively in lap joint, and disaster prevention and control blank zones are avoided.

Description

technical field [0001] The invention belongs to the technical field of tunnel drilling in underground coal mines, and in particular relates to a short-distance multi-branch sidetracking drilling tool for directional holes in underground coal mines and a drilling method. Background technique [0002] Underground directional holes in coal mines have the advantages of high trajectory control, multiple branches in one hole, long extension distance of target strata, and wide coverage. [0003] Underground directional holes in coal mines generally include two parts: main holes and branch holes, among which branch holes are the key to improving the coverage of drilling holes and ensuring no blind spots in disaster prevention and control. At present, the directional holes in coal mines mainly use the non-hole bottom sidetracking branch technology and the slow-speed grinding branch method to carry out branch hole construction, which has the following shortcomings: [0004] First, br...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/04E21B7/18E21B43/10
CPCE21B7/04E21B7/18E21B43/10
Inventor 贾明群王传留吴智峰方俊李乔乔范运林王亚波马晓琳
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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