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Underground coal mine nearly horizontal directional drilling large-diameter steel sleeve hole completion system and method

A horizontal directional and directional drilling technology, applied in drilling equipment and methods, directional drilling, earthwork drilling, etc., can solve the problem that the uniformity of grouting thickness needs to be further improved, avoid penetration cracks, improve running Ability, reliable sealing effect

Pending Publication Date: 2022-06-24
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

[0009] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a large-diameter steel casing completion system and method for near-horizontal directional drilling in coal mines, and to solve the problem that the uniformity of grouting thickness in the prior art needs to be further improved. technical problem

Method used

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  • Underground coal mine nearly horizontal directional drilling large-diameter steel sleeve hole completion system and method
  • Underground coal mine nearly horizontal directional drilling large-diameter steel sleeve hole completion system and method
  • Underground coal mine nearly horizontal directional drilling large-diameter steel sleeve hole completion system and method

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Embodiment 1

[0070] This embodiment provides a near-horizontal directional drilling large-diameter steel casing completion system in a coal mine, such as figure 1 As shown, it includes a casing guide head 1, a plurality of steel casing strings 2 and a slurry feeder 5 that are sealed and connected in sequence from front to back, a casing guide head 1 and a steel casing string 2 adjacent to the casing guide head 1 A drag-reducing supporter 3 is sealedly connected therebetween, and a drag-reducing supporter 3 and a pressure-limiting sealer 4 are sealed and connected in sequence from front to back between two adjacent steel casing strings 2 .

[0071] like figure 2 and image 3 As shown, the drag reducing supporter 3 includes a hollow supporting short section 301 , the middle of the outer wall of the supporting short section 301 is provided with a plurality of supporting ribs 302 along the circumferential direction, and the supporting ribs 302 are arranged along the axial direction. Roller ...

Embodiment 2

[0085] This embodiment provides a method for completing a large-diameter steel casing for near-horizontal directional drilling in a coal mine.

[0086] Specifically, the method includes the following steps:

[0087] Step 1, directional drilling construction:

[0088] First, use the directional drilling machine 7 to construct the directional drilling 6 orifice section, lower the orifice casing 8 and grouting to fix the pipe; then carry out directional drilling according to the design trajectory of the directional drilling 6, and exit the hole after reaching the design depth. to the drill.

[0089] Step 2, run the steel casing string:

[0090] Sealing and connecting the casing guide 1, multiple steel casing strings 2, drag reducing support 3, pressure limiting seal 4 and slurry feeder according to the connection relationship of the large-diameter steel casing completion system for near-horizontal directional drilling in coal mines 5. Use the directional drilling machine 7 to ...

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Abstract

The invention provides a coal mine underground nearly horizontal directional drilling large-diameter steel casing pipe hole completion system and method, the system comprises a casing pipe guide head, a plurality of steel casing pipe strings and a slurry conveying device which are sequentially connected in a sealed mode from front to back, and a resistance reduction supporting device is connected between the casing pipe guide head and the steel casing pipe string adjacent to the casing pipe guide head in a sealed mode; a resistance reduction supporting device and a pressure limiting sealer are sequentially connected between every two adjacent steel sleeve strings in a sealed mode from front to back. The outer diameter of the anti-drag supporting device is smaller than that of the directional drilling hole, and the outer diameter of the pressure limiting sealer is smaller than that of the anti-drag supporting device. In the process of lowering the steel sleeve, the steel sleeve is supported at a slightly downward position in the middle of the hole wall by using the resistance-reducing supporter, and the pressure-limiting sealer can be prevented from being damaged; when the steel sleeve is grouted and fixed, the pressure limiting sealer is used for further adjusting the steel sleeve to be located in the middle of the directional drilling hole, segmented exhaust and high-pressure grouting are achieved, the uniformity of the grouting thickness is improved, and the existence of through cracks is avoided.

Description

technical field [0001] The invention belongs to the technical field of underground tunnel drilling in coal mines, relates to sub-horizontal directional drilling casings in coal mines, and in particular relates to a system and method for completing large-diameter steel casings for sub-horizontal directional drilling in coal mines. Background technique [0002] Crushed, soft and low-permeability coal seams are widely developed in mines with high gas and coal and gas outbursts. Affected by their low Platts hardness coefficient and poor gas permeability, gas drainage boreholes are difficult to drill along the bed, and the effective drainage radius is small, which leads to gas control The high cost and long cycle severely restrict mine mining continuity and safe production. [0003] In recent years, in view of the need for efficient gas drainage and control in broken and soft low-permeability coal seams, a gas drainage technology with directional drilling adjacent to roof fractur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/04E21B7/20E21B33/12E21B33/14E21B34/08
CPCE21B7/046E21B7/20E21B33/14E21B33/1208E21B34/08
Inventor 郝世俊方俊李泉新刘智刘飞褚志伟金鑫杨伟锋
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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