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Coalbed methane horizontal well and its construction method

A construction method and coalbed methane technology, applied in the direction of earthwork drilling, wellbore/well components, and mining fluids, can solve the problems of difficult multi-branch horizontal well stimulation and reconstruction, and coal reservoirs are easy to collapse, so as to improve permeability, The effect of widening the flow channel

Active Publication Date: 2022-08-05
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In areas with poor stability and poor permeability of coal reservoirs, the relative output of CBM is not high, but coal reservoirs are prone to collapse, making it difficult for technicians to stimulate production of multi-lateral horizontal wells completed in open holes

Method used

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  • Coalbed methane horizontal well and its construction method
  • Coalbed methane horizontal well and its construction method

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Embodiment Construction

[0052] In order to make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0053] In the field of coalbed methane technology, technicians mainly use multilateral horizontal wells to mine coalbed methane. Multilateral horizontal wells mostly use the open-hole completion method, that is, the casing is cemented in the well section above the coal reservoir, and the casing is not placed in the coal reservoir without cementing, so as to achieve the largest contact area with the coal reservoir. It has achieved good mining results in areas with good coal reservoir stability and high permeability. However, in areas with poor stability and low permeability of coal reservoirs, the relative production of coalbed methane is not high, and coal reservoirs are prone to collapse, making it difficult for technicians to stimulate ...

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Abstract

The application discloses a coalbed methane horizontal well and a construction method thereof, belonging to the technical field of coalbed methane exploitation. The CBM horizontal well includes a first well section, a second well section, a third well section, a first casing and a second casing, and a plurality of pipes are arranged on the pipe wall of the second casing located in the third well section. There are gas production holes, and gas production cracks are set at the position corresponding to each gas production hole on the third well section, which widens the flow channel of coalbed methane, greatly improves the permeability of coal reservoirs, and makes it easier for coalbed methane to escape from coal. The reservoir enters the second casing, realizing the increased production of CBM.

Description

technical field [0001] The present application relates to the technical field of coalbed methane exploitation, in particular to a coalbed methane horizontal well and a construction method thereof. Background technique [0002] my country's coalbed methane resources are rich and widely distributed, and efficient development of coalbed methane is conducive to alleviating the contradiction between natural gas supply and demand in my country. [0003] In the related art, coalbed methane is usually exploited by means of surface drilling and exploitation. The main well type of a CBM well is a multi-lateral horizontal well, which has a vertical well section, a deflection section and a horizontal section. The vertical well section is basically perpendicular to the ground, and the horizontal section is basically parallel to the ground and has multiple branches extending in the coal reservoir. The deflection section is arc-shaped and connects the vertical well section and the horizon...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/30E21B43/26E21B43/00
CPCE21B43/305E21B43/006E21B43/26
Inventor 朱庆忠刘立军陈必武李宗源刘斌李佳峰杨春莉王三帅卢锴余巍王金鹏
Owner PETROCHINA CO LTD