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U-shaped well system and drilling method thereof

A U-shaped, drilling technology, used in directional drilling, wellbore/well components, earth-moving drilling, etc., can solve the problems of limited control area and difficulty in increasing the discharge and production volume, etc., to expand the contact area and achieve good discharge and production effect. , the effect of improving the discharge volume

Inactive Publication Date: 2015-12-09
CHINA SHENHUA ENERGY CO LTD +1
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Problems solved by technology

[0003] The main purpose of the present invention is to provide a U-shaped well system and its drilling method to solve the problems in the prior art that the control area of ​​coalbed methane drainage is limited and the drainage volume is difficult to improve

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  • U-shaped well system and drilling method thereof

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Embodiment Construction

[0028] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0029] Such as figure 1 As shown, the U-shape well system in this embodiment is used for extracting coalbed methane from a single layer of coal in a coal mine. The U-shaped well system includes a vertical well 10 and a horizontal well 20 . Wherein, the horizontal well 20 has a vertical well section 21 , a horizontal well section 22 and a transition well section 23 connected between the vertical well section 21 and the horizontal well section 22 . The end of the horizontal well section 22 away from the transition well section 23 communicates with the vertical well 10 . Horizontal well 20 also includes two deviated lateral intervals 24 . One end of the above-mentioned inclined branch well sec...

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Abstract

The invention provides a U-shaped well system and a drilling method thereof. The U-shaped well system comprises a straight well (10) and a horizontal well (20). The horizontal well (20) comprises a vertical well section (21), a horizontal well section (22) and a transition well section (23) connected between the vertical well section (21) and the horizontal well section (22). The end, away from the transition well section (23), of the horizontal well section (22) is communicated with the straight well (10). The horizontal well (20) further comprises an inclined branch well section (24), and one end of the inclined branch well section (24) is connected to the horizontal well section (22). According to the technical scheme, the problems that in the prior art, the control area of coalbed methane extraction is limited, and the extraction amount can be hardly improved can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of coal bed gas extraction, in particular to a U-shaped well system and a drilling method thereof. Background technique [0002] At present, when extracting coalbed methane from two layers of coal in coal mines, the commonly used method of connecting the ground and the underground is: the far-end U-shaped butt joint connection well (vertical well and horizontal well connection), in which the horizontal section is not fracture. Since the horizontal section is not fractured, the drainage is greatly restricted by the natural conditions of the coal seam, the control area of ​​the drainage is limited, and it is difficult to increase the drainage. Contents of the invention [0003] The main purpose of the present invention is to provide a U-shaped well system and its drilling method, so as to solve the problems in the prior art that the control area of ​​coalbed methane drainage is limited and the drainage volu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/30E21B7/04
Inventor 崔春兰向军文刘福义李明建安世刚白枫桐
Owner CHINA SHENHUA ENERGY CO LTD
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