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Double coal seam four-channel packer layered pressure control combined drainage device and method

A packer, four-channel technology, applied in the directions of sealing/packing, production of fluids, and earth-moving drilling, etc., to achieve the effect of reducing interlayer interference, reducing reservoir damage, and reducing the probability of occurrence

Active Publication Date: 2019-12-17
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to provide a coalbed gas well double coal seam four-channel packer layered pressure control combined drainage device and method, which can separate the two coal seam sections in the wellbore and effectively avoid the occurrence of double coal seam development vertical well combined layer drainage. Interference between complex layers solves the problem of layered pressure control in double coal seam drainage and improves gas well productivity

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  • Double coal seam four-channel packer layered pressure control combined drainage device and method

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Embodiment Construction

[0027] see Figure 1-2 , shows a coalbed methane well double coal seam four-channel packer layered pressure control combined drainage device of the present invention, which includes oil production strings 2, 12, 15, 16, four-channel packer 8, pressure gauge cable 4 , lower coal seam gas production pipe 6, upper coal seam liquid passage pipe 5, characterized in that:

[0028] The oil production string includes oil pipe 2, pump barrel 12, screen pipe 15, and sand settling pipe 16, and other types of oil production strings can also be selected, such as hydraulic rodless oil production string, jet pump string and hydraulic piston pump pipe column.

[0029] The four-channel packer 8 is connected with the production string 2 through the upper and lower threads of the main fluid production channel 19 .

[0030] Wherein, the four-channel packer 8 includes a main liquid production channel 19 , a lower coal seam gas production channel 18 , an upper coal seam liquid passage 17 and a ca...

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Abstract

The invention relates to a drainage device and method, belonging to the technical field of coalbed methane development, and in particular to a combined drainage device and method of layered pressure control with double coal seam four-channel packers. The present invention isolates two coal seams in different pressure systems, and the upper part of the upper coal seam liquid passage is connected with a liquid pipe, which can maintain a certain liquid level depth, even if the wellbore liquid level drops below the upper coal seam, it will not cause the upper coal seam Bare, so that while ensuring the best gas production effect of the lower coal seam, it can still ensure the best gas production effect of the upper coal seam, reduce reservoir damage, and reduce interlayer interference in the process of double coal seam drainage.

Description

technical field [0001] The invention relates to a drainage device and method, belonging to the technical field of coalbed methane development, in particular to a coalbed gas well double coal seam four-channel packer layered pressure control combined drainage device and method. Background technique [0002] At the present stage, vertical wells for the development of double-coal seam coalbed methane mostly adopt the method of combined seam drainage and production. Since there are two pressure-controlled gas production periods in double-coal seams, after entering the pressure-controlled and stable production period, in order to ensure the gas production effect of the upper coal seam, the lower coal seam will be seriously delayed. Similarly, in order to ensure the gas production effect of the lower coal seam, the liquid level depth must drop below the upper coal seam, thereby exposing the upper coal seam. How to simultaneously control the reservoir pressure of the two coal beds ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/00E21B43/14E21B33/12
CPCE21B33/12E21B43/12E21B43/14
Inventor 李彬刚万志杰高腾飞范耀庞涛刘嘉巫修平张东亮何国龙史小平
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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