WELLBORE FOR PURE GAS EXTRACTION

WIPO Patent Application WO/2022/193802

A1

Disclosed is a wellbore for pure gas extraction. The wellbore is used for extracting the gas contained in all coalbeds of a coalbed group simultaneously to produce coalbed gas. The wellbore comprises a wellbore cover plate (3), a wellbore (4) passing through all the coalbeds, drilling site niches (5) in all the coalbeds, and a plurality of gas extraction coal holes (6) connected in sequence in the coalbed. A wellbore gas extraction pipeline (11) in the wellbore is connected to a gas extraction vacuum pump (10) on the ground. A wellbore gas injection pipe (9) along the full length of the wellbore is connected to a gas user pipe network on the ground. A ground air extractor is connected to an air extraction pipe (8) inserted into the wellbore. The ground air extractor is turned on to discharge all the air in the wellbore, and the wellbore gas injection pipe is turned on to inject gas having the same volume into the wellbore from the bottom of the wellbore to replace the air. The air extractor and the wellbore gas injection pipe are turned off, and the gas extraction vacuum pump is turned on to extract the coalbed gas. The wellbore is applicable to a variety of coalbed groups.

CHAI ZHAOXI (CN)

PCT/CN2022/070256

September 22, 2022

January 05, 2022

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CHAI ZHAOXI (CN)

E21B17/00; E21F7/00

WO2009039776A1

2009-04-02

CN112780334A	2021-05-11
CN104989406A	2015-10-21
CN107420126A	2017-12-01
CN111472832A	2020-07-31
CN2913612Y	2007-06-20
US20150247385A1	2015-09-03

BEIJING GUOQIAN PATENT AGENCY (GENERAL PARTNERSHIP) (CN)

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