Multi-round compressed air deblocking method for coal bed gas well fracturing and blocking

A technology of compressing air and compressed gas, which is applied in earthwork drilling, wellbore/well components, and production fluids, etc. It can solve the problems of dredging and plugging, many construction equipments, and high construction costs, so as to save operating costs, low costs, The effect of secondary damage is small

Active Publication Date: 2018-11-02
北京方圆天地油气技术有限责任公司
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Problems solved by technology

[0005] In view of this, the present invention provides a multi-round compressed air deblocking method for clogged coal seam gas fracturing wells, which overcomes the inability to dredge and unblock cracks that have been blocked by coal powder in the coal seams of fracturing wells, The lack of formation pressure causes the secondary blockage caused by the coal powder carried by the washing fluid into the coal seam, and solves the problem that the high-pres

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  • Multi-round compressed air deblocking method for coal bed gas well fracturing and blocking
  • Multi-round compressed air deblocking method for coal bed gas well fracturing and blocking
  • Multi-round compressed air deblocking method for coal bed gas well fracturing and blocking

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Embodiment Construction

[0034] The following describes the technical solutions in the embodiments of the present invention clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0035] The multi-round compressed air huffing and puffing method for removing blockage of a coal seam gas pressure fracturing blocked well according to the present invention adopts the following steps:

[0036] (1) The tubing 19 is inserted into the wellbore as a plug-removing string, and the plug-removing string is close to the target layer, and then the wellhead is installed and the surface manifold process is connected;

[0037] (2) After the pressure test is qualified, open the injection control valve 4 in the manifold proces...

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Abstract

The invention relates to a deblocking method for coal bed gas well fracturing and powder blocking in the field of coal bed gas exploitation. The method includes adopting an air compressor to slowly inject compressed air from the ground into a shaft of a blocked coal bed gas well to form certain high pressure in the shaft and a coal bed, then opening a well opening discharge valve to quickly release high pressure gas in the shaft, so that blocking coal powder and sand in a fracturing crack will be loosened and move to the shaft with the compressed air and then return to the ground through a delocking pipe column. The process is repeated for multiple rounds to eliminate the well fracturing and coal powder blocking phenomenon, and the gas production will be restored. More importantly, the coal bed is not damaged, and high application value is achieved.

Description

Technical field [0001] The invention relates to the technical field of coalbed methane mining, and more specifically to a method for removing blockage of coal seam gas pressure fracturing blocked wells with multi-round compressed air. Background technique [0002] In the field of coalbed methane exploration and development, vertical wells and cluster wells are usually drilled through hydraulic fracturing, or horizontal wells are drilled through staged hydraulic fracturing, and various patterns of water that are not reconstructed through hydraulic fracturing are drilled in coal seams. Flat boreholes are used to increase the exposed area of ​​coal seams, and to achieve coal-bed methane extraction through drainage and pressure reduction. Drainage and depressurization gas extraction is through artificial lifting technology, usually pumping unit or screw pump to discharge the water in the wellbore to the ground (tubing drainage), the liquid level in the wellbore drops, and the bottom ...

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Application Information

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IPC IPC(8): E21B43/16E21B21/16
CPCE21B21/16E21B43/16
Inventor 王建生
Owner 北京方圆天地油气技术有限责任公司
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