Title:
METHOD FOR EFFICIENT GAS DRAINAGE IN COAL ROADWAY STRIPS AND REGIONAL OUTBURST ELIMINATION THROUGH STAGED FRACTURING WITH LONG BOREHOLE FLOOR BEDDINGS
Document Type and Number:
WIPO Patent Application WO/2018/201706
Kind Code:
A1
Abstract:
The present invention applies to projects such as regional outburst elimination for coal roadway driving or for coal extraction, and discloses a method for efficient gas drainage in coal roadway strips and regional outburst elimination by performing staged fracturing with long borehole floor beddings. Staged fracturing is performed by drilling a floor bedding borehole (5) into a hard floor stratum (2) of a coal seam (1) having outburst risk in an existing roadway (3) along a direction of a coal seam roadway (4) to be driven, and regional outburst elimination on coal road strips is performed by stage-by-stage drainage or drainage in a whole stage by means of fractured fissures; and it is determined, according to a drainage amount, whether drainage has reached a set standard; if so, a coal seam borehole (6) is constructed along boundaries on both sides of the coal seam roadway within a range of effective outburst prevention measures, an effectiveness test on the regional outburst prevention measures and further drainage are performed; and then coal seam roadway driving is performed while enforcing a rule of regional verifying measures and partial four-in-one measures. The present invention has advantages such as replacement of roadways with boreholes, a low number of boreholes, a wide fracturing range, a low degree of stress concentration in coal bodies surrounding fracturing regions, effective pressure relief, a short period of time in reaching a drainage standard, good applicability in coal seam parameters, and a wide range of applications.
Inventors:
WANG ENYUAN (CN)
QIU LIMING (CN)
LI ZHONGHUI (CN)
OU JIANCHUN (CN)
QIU LIMING (CN)
LI ZHONGHUI (CN)
OU JIANCHUN (CN)
Application Number:
PCT/CN2017/113125
Publication Date:
November 08, 2018
Filing Date:
November 27, 2017
Export Citation:
Assignee:
UNIV CHINA MINING (CN)
International Classes:
E21F7/00; E21B43/26
Foreign References:
| CN106907175A | 2017-06-30 | |||
| CN102155254A | 2011-08-17 | |||
| CN103899348A | 2014-07-02 | |||
| CN102704905A | 2012-10-03 | |||
| CN102182499A | 2011-09-14 | |||
| CN101575983A | 2009-11-11 | |||
| CN101403314A | 2009-04-08 | |||
| US3934649A | 1976-01-27 |
Attorney, Agent or Firm:
NANJING SUGAO PATENT AND TRADEMARK FIRM (ORDINARY PARTNERSHIP) (CN)
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