Title:
METHOD OF PERFORMING COMBINED DRILLING, FLUSHING, AND CUTTING OPERATIONS ON COAL SEAM HAVING HIGH GAS CONTENT AND PRONE TO BURSTS TO RELIEVE PRESSURE AND INCREASE PERMEABILITY
Document Type and Number:
WIPO Patent Application WO/2017/092207
Kind Code:
A1
Abstract:
A method of performing coupled drilling, flushing, and cutting operations on a coal seam having a high gas content and prone to bursts to relieve pressure and increase permeability, particularly suitable for relieving pressure and increasing permeability when drilling a through-seam borehole to pre-drain gas belts in a coal mine roadway (4) in a coal seam (2) having a high gas content and prone to bursts. On the basis of the means of pre-draining a gas from the coal seam (2) via the through-seam borehole (3), hydraulic flushing and hydraulic cutting are organically combined by employing a specialized drilling, flushing, and cutting apparatus, and combined operations of low-pressure borehole drilling, middle-pressure flushing, and high-pressure cutting are performed within the drilled borehole to create deformation and displacement in a coal body in the pre-drainage region, and in turn form a network of cracks, such that channels for desorption and mobility of the gas are created to facilitate removal of the gas. The method can enlarge an effective pressure-relief range of each single borehole, increase the permeability of the coal seam, improve gas removal efficiency, reduce the number of pre-drainage boreholes, reduce pre-drainage operation time, and has superior adaptability to coal seams having different storage states. The method can decrease the number of through-seam boreholes by 32.5% and the length thereof by 42.9%, and has a prominent effect in preventing bursts in a coal mine roadway region, thereby significantly accelerating an excavation speed.
Inventors:
LING BAIQUAN (CN)
LIU TONG (CN)
GAO YABIN (CN)
YANG WEI (CN)
LI HE (CN)
HUANG ZHANBO (CN)
WANG RUI (CN)
LIU TONG (CN)
GAO YABIN (CN)
YANG WEI (CN)
LI HE (CN)
HUANG ZHANBO (CN)
WANG RUI (CN)
Application Number:
PCT/CN2016/077971
Publication Date:
June 08, 2017
Filing Date:
March 31, 2016
Export Citation:
Assignee:
UNIV CHINA MINING & TECH (CN)
International Classes:
E21F7/00; E21B43/26
Foreign References:
| CN104131832A | 2014-11-05 | |||
| CN105422069A | 2016-03-23 | |||
| CN104563990A | 2015-04-29 | |||
| US6024171A | 2000-02-15 | |||
| CN101644166A | 2010-02-10 |
Attorney, Agent or Firm:
NANJING RUIHONG PATENT & TRADEMARK OFFICE (ORDINARY PARTNERSHIP) (CN)
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