Compound cave making method of open hole of coalbed gas well

A coalbed methane well and cavitation technology, which is applied to drilling equipment and methods, liquid/gas jet drilling, drilling equipment, etc., can solve the problems of reducing the operating intensity of mechanical cavitation tools, so as to reduce operational risks and meet high-efficiency mining , Operational safety effect

Inactive Publication Date: 2012-04-25
CNPC BOHAI DRILLING ENG
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Problems solved by technology

[0003] The purpose of the present invention is to propose a method for compound cavitation in the open hole of a coalbed methane well, that is, to use the hydraulic jet to destroy the coal seam and reduce the working intensity of the mechanical cavitation tool; To the design value, it is to continue to make holes with mechanical tools on the basis of hydraulic jet hole making, overcome the defects and shortcomings of using a single method of hole making, meet the needs of reaming operations or cave operations in the open hole section of coalbed methane wells, and achieve The purpose of efficient oil and gas extraction

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  • Compound cave making method of open hole of coalbed gas well
  • Compound cave making method of open hole of coalbed gas well
  • Compound cave making method of open hole of coalbed gas well

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Embodiment Construction

[0028] Taking the D 152 main wellbore as an example below, the open-hole composite cavitation method for coalbed methane wells of the present invention will be further described in conjunction with the accompanying drawings, which mainly includes the following steps:

[0029] The first step, preparation, cleaning and testing of hydrojet tools in the open hole section of coalbed methane well

[0030] Determine the depth and location of the cave in the open hole section of the coal seam, that is, the top and bottom positions of the cave section; use the conventional coal seam drilling method to drill through the coal seam, and the casing is lowered to the top of the open hole section where the coal seam section is made, and the coal seam borehole is drilled by circulation. The cuttings and coal cuttings are cleaned up, the wellbore is smooth and free of falling objects, and there is no plugging of cuttings and sand to ensure that the cavitation tool can reach the bottom of the we...

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Abstract

The invention relates to a compound cave making method of an open hole of a coalbed gas well, which is mainly used for reaming operation or open hole cave making operation of an open hole well section of the coalbed gas well. Hydraulic jet is utilized for destroying a coalbed, thereby reducing the operating strength of a mechanical cave making tool; and then a mechanical tool is further utilized for finishing the coalbed at a cave making section, the size of a cave is expanded to the designed value, and the cave making is continuously performed through the mechanical tool on the basis of hydraulic jet cave making, thereby overcoming the defects and the insufficiencies caused by the single cave making method, meeting the demands of the reaming operation or the cave operation of the open hole well section of the coalbed gas well and achieving the purpose of high-efficient oil and gas production.

Description

technical field [0001] The invention relates to an open-hole composite cave-making method of a coalbed methane well, which is mainly used for the reaming operation of the open-hole section of the coalbed methane well or the open-hole cave-making operation, and satisfies the needs of the completion of the open-hole cave to realize efficient exploitation of coalbed methane, and belongs to the category of coalbed methane field of mining methods. Background technique [0002] At present, in domestic and foreign coalbed methane well mining, there are mainly three kinds of open-hole cave-making techniques, namely, negative pressure cave-making, hydraulic jet cave-making and mechanical tool cave-making. Negative pressure cavitation technology generally uses a specially modified drilling or completion operation machine to penetrate the formation, and press a large amount of air into the well through several high-power air compressors, rotary heads and ground multiple pipeline system...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/00E21B7/18E21B7/28
Inventor 王益山周俊然蒋海涛董颖
Owner CNPC BOHAI DRILLING ENG
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