公开(公告)号：US20220213773A1

公开(公告)日：2022-07-07

申请号：US17627117

申请日：2020-07-23

申请人： SHANDONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

发明人： Gang WANG ,  Zhiyuan LIU ,  Weimin CHENG ,  Xiangjie QIN ,  Jiuyuan FAN ,  Lulu SUN ,  Zhen LIU ,  Guanhua NI ,  Yanbin YU ,  Yixin LIU ,  Qiming HUANG

IPC分类号： E21B43/26 ,  E21C41/18

摘要： A deep low-permeability high gassy seam drilling-slitting-sealing-fracturing drilling device includes a drilling control system, a high-pressure water power system, a water pressure grading control system and a fracturing and sealing control system. The drilling control system adjusts a drilling direction a water supply pressure of the drill rod, the high-pressure water power system supplies high-pressure water with different pressures to the device, and the water pressure grading control system ensures that a water pressure for flushing drill cuttings is less than 5 MPa, a water pressure for slitting in a direction perpendicular to a length of the drill rod is 25-35 MPa, a water pressure for sealing with a borehole sealing capsule is 35-40 MPa, and a water pressure for further pressure relief and permeability increasing of a coal seam is 40-50 MPa. The fracturing and sealing control system controls borehole sealing and hydrofracturing operations.