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High gas suction and discharge process method for complex well

A process method and technology with complex structure, which can be used in gas discharge, earth-moving drilling, wellbore/well components, etc., and can solve the problems of high cost and long time.

Inactive Publication Date: 2013-01-02
BEIJING JIUZUN ENERGY TECH
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Problems solved by technology

[0004] The other is to open an auxiliary roadway on the bottom of the coal seam, and then mine the upper high-gas mine, and use the method of mining the upper coal seam while the floor collapses while draining, which is costly and takes a long time

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  • High gas suction and discharge process method for complex well

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Embodiment Construction

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0018] The embodiment of the present invention proposes a process method for draining high gassy gas from wells with complex structures, which includes the following steps:

[0019] A. Drilling vertical or directional wells on the ground 1;

[0020] B. drilling branched horizontal wells on the ground, and the branched horizontal wells communicate with the above-mentioned vertical wells or directional wells;

[0021] C. Drain gas at the wellhead of vertical we...

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Abstract

An embodiment of the invention discloses a high gas suction and discharge process method for a complex well. The process method includes the steps: A, drilling a straight well or a directional well on the ground; B, drilling a branch horizontal well on the ground, wherein the branch horizontal well is communicated with the straight well or the directional well; and C, sucking and discharging gas in the straight well or the directional well. The straight well or the directional well is drilled on the ground, and then the branch horizontal well is drilled on the ground and communicated with the straight well or the directional well, so that an approximately communicated closed-loop complex well network is formed to be communicated with a coal bed fissure system, coal bed gas pressure is quickly reduced, coal bed gas is sucked and discharged, and a foundation is laid for safety production of high gas coal mines.

Description

technical field [0001] The present invention relates to the fields of coal mine safety mining and coalbed methane development, and also relates to the field of petroleum engineering directional well and horizontal well drilling engineering technology, in particular to a complex structure well drainage process for high gas gas, which can be used for high gas content, high gas content, Coal mines with high pressure can also be used in coal mines with good mechanical stability of the coal seam roof, relatively uniform distribution of coal seams, and no large faults or collapse columns. Background technique [0002] At present, there are two conventional methods of gas drainage in high gas mines: [0003] One is to drill horizontal holes in the coal seam or roof under the mine, the length and diameter of the wellbore are greatly limited, the drainage is very slow, and the efficiency of gas drainage is low; [0004] The other is to open an auxiliary roadway on the bottom of the ...

Claims

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Application Information

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IPC IPC(8): E21B43/00E21B43/30E21F7/00
Inventor 李玉魁
Owner BEIJING JIUZUN ENERGY TECH
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