Title:
COALBED METHANE HORIZONTAL WELL HOLE COLLAPSE CAVE-BUILDING PRESSURE RELIEF DEVELOPING SYSTEM AND METHOD
Document Type and Number:
WIPO Patent Application WO/2019/205517
Kind Code:
A1
Abstract:
The invention discloses a coalbed methane horizontal well hole collapse cave-building pressure relief developing system and method. An inlet of an abrasive mixing device (6) in the system separately is communicated with a liquid storage tank (1) and an abrasive tank (5), an outlet is communicated with an inlet of a ground power device (7), an outlet of the ground power device (7) is communicated with an underground injection device (8), and the underground injection device (8) is positioned at the position, near a wellhead, of the horizontal section of a horizontal well. After chambering cave-building barefoot well completion of the horizontal well is completed, a mixed fluid is delivered to the underground at a certain frequency by means of the ground power device (7) and sprayed out by means of the underground injection device (8), so that the pressure pulsation excitation and stress release in the horizontal well of the structured coalbed methane are realized, and the coal-liquid-gas mixture moves along the pressure relief space to the vertical well section by means of hydraulic displacement. The system and method can realize the pressure relief and stress release of tectonic coal in-situ horizontal well hole collapse cave-building and provide a basis for realizing efficient and continuous mining of the tectonic coal in-situ coalbed methane.
Inventors:
LIU SHIQI (CN)
SANG SHUXUN (CN)
WANG RAN (CN)
CAO LIWEN (CN)
ZHOU XIAOZHI (CN)
HUANG HUAZHOU (CN)
FANG HUIHUANG (CN)
WANG HE (CN)
GAO DEYI (CN)
WANG HAIWEN (CN)
LIU HUIHU (CN)
LI ZICHENG (CN)
LIU CHANGJIANG (CN)
XU HONGJIE (CN)
JIA JINLONG (CN)
SANG SHUXUN (CN)
WANG RAN (CN)
CAO LIWEN (CN)
ZHOU XIAOZHI (CN)
HUANG HUAZHOU (CN)
FANG HUIHUANG (CN)
WANG HE (CN)
GAO DEYI (CN)
WANG HAIWEN (CN)
LIU HUIHU (CN)
LI ZICHENG (CN)
LIU CHANGJIANG (CN)
XU HONGJIE (CN)
JIA JINLONG (CN)
Application Number:
PCT/CN2018/110876
Publication Date:
October 31, 2019
Filing Date:
October 18, 2018
Export Citation:
Assignee:
UNIV CHINA MINING (CN)
XUZHOU OLIVINE GEOSCIENCE & GEOTECH CO LTD (CN)
XUZHOU OLIVINE GEOSCIENCE & GEOTECH CO LTD (CN)
International Classes:
E21F7/00; E21B7/18
Foreign References:
| CN102536302A | 2012-07-04 | |||
| CN102966309A | 2013-03-13 | |||
| CN104763462A | 2015-07-08 | |||
| CN102425397A | 2012-04-25 | |||
| US20170145794A1 | 2017-05-25 | |||
| US20070062693A1 | 2007-03-22 |
Attorney, Agent or Firm:
NANJING JINGWEI PATENT & TRADEMARK AGENCY CO., LTD (CN)
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