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Close-range multi-branch sidetrack drilling tool and drilling method for a directional hole in a coal mine

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

Active Publication Date: 2022-08-02
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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  • Close-range multi-branch sidetrack drilling tool and drilling method for a directional hole in a coal mine
  • Close-range multi-branch sidetrack drilling tool and drilling method for a directional hole in a coal mine
  • Close-range multi-branch sidetrack drilling tool and drilling method for a directional hole in a coal mine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0062] A section of positioning groove 111 is provided on the inner wall of the pilot drilling tool 1, such as figure 2 As shown, there is a guide port 121 on the wall of the guide sleeve 12 for the flexible branch drilling tool 2 to extend, such as image 3 shown.

[0063] The pilot drilling tool 1 includes a guide sleeve 12 connected with an outer sleeve 11 and the outer sleeve 11 , and the inner holes of the outer sleeve 11 and the guide sleeve 12 have the same diameter. Preferably, the outer sleeve 11 and the guide sleeve 12 are connected by a hexagonal male joint and a hexa...

Embodiment 2

[0074] In order to realize the completion of the screen pipe of the branch hole 5 and avoid the collapse and failure of the branch hole, a screen pipe completion drill 3 is also provided on the basis of the drilling tool of Example 1.

[0075] like Figure 8 As shown, the screen tube completion drilling tool 3 of the present embodiment includes a screen tube 31 and a push section 32 connected to the screen tube 31. The push section 32 is provided with a channel, which is used for the transmission of gas and the like in the branch hole 5. circulation. The channel is provided with a valve body 322 , and the high-pressure flushing liquid first pushes the valve body 33 to close the flow channel, and then the flushing liquid pushes the entire screen tube completion drilling tool 3 into the branch hole 5 .

[0076] In this embodiment, as Figure 9 As shown, the push short joint 32 includes a housing 321, a valve body 322 and a third elastic member 323, and the third elastic member...

Embodiment 3

[0080] The present embodiment discloses a method for short-distance multi-branch sidetracking in a directional hole in a coal mine. Specifically, the drilling tool described in Embodiment 1 is used to drill the branch hole, which 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; , connect the guide sleeve 12 and the outer sleeve 11 in turn;

[0082] Step 2: Adjust the direction of the pilot hole 121: After adjusting the direction of the pilot hole 121 of the pilot drill 1 to make it consistent with the direction of the designed sidetrack branch, lock the pilot hole 1. Specifically, when adjusting, slowly rotate the pilot drill 1 , since the orientation of the pin 26 is the same as the orientation of the guide port 121 , it can be adjusted according to the orientation of the pin 26 .

[0083] Step 3,...

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Abstract

The invention discloses a short-distance multi-branch sidetracking drilling tool for a directional hole in a coal mine and a drilling method. The drilling tool comprises a steering drilling tool and a flexible branch drilling tool which can be inserted into the steering drilling tool; A section of positioning groove, the guide casing pipe wall is provided with a guide port for the flexible branch drilling tool to extend; the flexible branch drilling tool includes an inner drill pipe, a positioning joint, a coiled pipe, an elbow joint and a nozzle connected in sequence, and the positioning joint includes a joint The pipe body, the locating key arranged along the radial direction of the joint pipe body, and the locating key adjusting member for adjusting the radial position of the locating key; the present invention can precisely control the opening branch direction by adjusting the attitude of the pilot drilling tool, and under the guidance of the pilot drilling tool , the sidetracking branch can be carried out in any direction along the radial direction of the borehole; and the number and spacing of branch holes are not affected by the reserved branch points, which can ensure that each branch hole is effectively overlapped and avoids the blank zone of disaster prevention and control.

Description

technical field [0001] The invention belongs to the technical field of underground tunnel drilling in coal mines, and in particular relates to a short-distance multi-branch sidetrack drilling tool for directional holes in a coal mine 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] Oriented holes in coal mines generally include two parts: main holes and branch holes. Among them, branch holes are the key to improving the coverage of drilling holes and ensuring that there are no blind spots in disaster prevention and control. At present, the underground directional holes in coal mines mainly use the non-hole bottom side drilling branch technology and the slow grinding branching method for branch hole construction, which have the following shortcomings: [0004] First, branch points ...

Claims

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Application Information

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Patent Type & Authority Patents(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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