公开(公告)号：US20170370156A1

公开(公告)日：2017-12-28

申请号：US15548060

申请日：2016-03-31

Applicant: CHINA UNIVERSITY OF MINING AND TECHNOLOGY

Inventor： Boquan LIN ,  TONG LIU ,  Yabin GAO ,  HE LI ,  Zhanbo HUANG ,  Rui WANG ,  Wei YANG

IPC: E21B7/18 ,  E21F7/00 ,  E21B7/04

CPC classification number: E21B7/18 ,  E21B7/046 ,  E21F7/00

Abstract: The present invention relates to a “drilling-flushing-slotting” coupled pressure relief and permeability increasing method for a high gas outburst coal seam, which is more particularly suitable for the pressure relief and permeability increasing when gas of a roadway band of the high gas outburst coal seam is pre-extracted through crossing boreholes. On the basis of the crossing borehole pre-extraction measures for the coal seam gas, the hydraulic flushing and the hydraulic slotting are reasonably combined, and a “drilling-flushing-slotting” dedicated device is utilized to implement the coupled operation of “low pressure drilling-medium pressure flushing-high pressure slotting” in a borehole, so that the coal in the pre-extraction area is deformed and moved to form network cracks, passages are provided to the desorption flow of the gas, and the gas is easier to extract. The method can enlarge the single-hole pressure relief influence range, increase the gas permeability of the coal seam, improve the gas extraction efficiency, reduce the number of pre-extraction boreholes, shorten the pre-extraction time and have good applicability to the coal seams in different occurrence states. The present invention can reduce the number of the crossing boreholes by 32.5% and can reduce the length of each crossing borehole by 42.9%, is remarkable in coal roadway regional outburst eliminating effect, and obviously increases the tunneling speed.