Title:
SEGMENTED FRACTURING HORIZONTAL WELL COAL SEAM GAS EXTRACTION METHOD FOR BROKEN SOFT LOW-PERMEABILITY COAL SEAM ROOF OR FLOOR
Document Type and Number:
WIPO Patent Application WO/2022/237177
Kind Code:
A1
Abstract:
Disclosed is a segmented fracturing horizontal well coal seam gas extraction method for a broken soft low-permeability coal seam roof or floor, the method comprising: determining the type of a horizontal well on the basis of exploration data and mine data; determining the position of the horizontal well on the basis of the exploration data and the mine data; on the basis of the exploration data and the mine data, determining a target layer position of a horizontal segment of the horizontal well in a coal seam roof or floor, and the vertical distance between the horizontal segment of the horizontal well and a coal seam top/bottom face; determining a layout azimuth of the horizontal segment of the horizontal well according to the direction of the minimum horizontal principal stress in a target mining area; completing drilling of a vertical well segment; performing geologic steering drilling of the horizontal segment of the horizontal well by means of an azimuth gamma geologic steering method, and adjusting a drilling trajectory of the horizontal segment of the horizontal well in real time; performing segmented packing on the horizontal segment of the horizontal well, and implementing directional perforation or multi-cluster directional perforation in the direction of a coal seam, so as to perform multi-cluster temporary plugging and steering segmented fracturing construction; and after the multi-cluster temporary plugging and steering segment fracturing construction is completed, performing backflow, well through-washing, and coal seam gas drainage and extraction.
Inventors:
ZHANG QUN (CN)
JIANG ZAIBING (CN)
LI BINGANG (CN)
XU YAOBO (CN)
WANG CHENG (CN)
ZHOU JIAJIA (CN)
LI HAOZHE (CN)
CHEN GANG (CN)
JIANG WENPING (CN)
DU XINFENG (CN)
ZHANG PEIHE (CN)
LIU BAIGEN (CN)
SHU JIANSHENG (CN)
FAN YAO (CN)
LIU JIA (CN)
ZHAO LONG (CN)
PANG TAO (CN)
LIU LEI (CN)
JIANG ZAIBING (CN)
LI BINGANG (CN)
XU YAOBO (CN)
WANG CHENG (CN)
ZHOU JIAJIA (CN)
LI HAOZHE (CN)
CHEN GANG (CN)
JIANG WENPING (CN)
DU XINFENG (CN)
ZHANG PEIHE (CN)
LIU BAIGEN (CN)
SHU JIANSHENG (CN)
FAN YAO (CN)
LIU JIA (CN)
ZHAO LONG (CN)
PANG TAO (CN)
LIU LEI (CN)
Application Number:
PCT/CN2021/140941
Publication Date:
November 17, 2022
Filing Date:
December 23, 2021
Export Citation:
Assignee:
XIAN RESEARCH INSTITUTE CHINA COAL TECH AND ENGINEERING GROUP (CN)
International Classes:
E21B43/267; E21F7/00
Foreign References:
| CN111520119A | 2020-08-11 | |||
| CN112983385A | 2021-06-18 | |||
| CN103967472A | 2014-08-06 | |||
| CN107387034A | 2017-11-24 | |||
| US20060243443A1 | 2006-11-02 |
Other References:
WU YOU-BIN; CHENG ZHI-GANG; LUO SHAO-CHENG; CUI WEI; MU YU; TU HUI-ZHI: "Research and Application of Fast Forward and Inversion for Gamma Imaging Logging while Drilling", PROCEEDINGS OF INTERNATIONAL FIELD EXPLORATION AND DEVELOPMENT CONFERENCE 2020; 2020-09-23; CHENGDU, SICHUAN, CHINA, 23 September 2020 (2020-09-23) - 23 September 2020 (2020-09-23), pages 107 - 114, XP009541495, DOI: 10.26914/c.cnkihy.2020.042214
FANG JIAWEI, HAN BAOSHAN;ZHOU JIAJIA;WANG ZHENGXI;ZHANG DINGLIANG;LIU JIA;XU JIANJUN: "Surface efficient gas extraction mode based on full coverage of working face", COAL GEOLOGY AND EXPLORATION, vol. 48, no. 3, 30 June 2020 (2020-06-30), pages 81 - 85, XP093003578, ISSN: 1001-1986, DOI: 10.3969/j.issn.1001-1986.2020.03.012
FANG JIAWEI, HAN BAOSHAN;ZHOU JIAJIA;WANG ZHENGXI;ZHANG DINGLIANG;LIU JIA;XU JIANJUN: "Surface efficient gas extraction mode based on full coverage of working face", COAL GEOLOGY AND EXPLORATION, vol. 48, no. 3, 30 June 2020 (2020-06-30), pages 81 - 85, XP093003578, ISSN: 1001-1986, DOI: 10.3969/j.issn.1001-1986.2020.03.012
Attorney, Agent or Firm:
HENG TAI INTELLECTUAL PROPERTY AGENCY (CN)
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