公开(公告)号：US20220213773A1

公开(公告)日：2022-07-07

申请号：US17627117

申请日：2020-07-23

Applicant: SHANDONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

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

IPC: E21B43/26 ,  E21C41/18

Abstract: 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.

公开(公告)号：US20170146679A1

公开(公告)日：2017-05-25

申请号：US15359751

申请日：2016-11-23

Applicant: Shandong University of Science and Technology

Inventor： Weimin CHENG ,  Zhen LIU ,  Gang WANG ,  Gang ZHOU ,  Lianjun CHEN ,  Wen NIE ,  Lin XIN ,  Yanbin YU ,  Guanhua Nl ,  He YANG

IPC: G01V3/08 ,  E21F17/00

CPC classification number: E21F17/00 ,  E21B21/16 ,  E21F5/02 ,  E21F11/00 ,  G01N33/222 ,  G01V3/20 ,  Y02A90/342

Abstract: Described are a test apparatus and a test method for the wetted perimeter of coal seam water injection. In the test apparatus, a columnar insulator is provided between an upper electrode and a lower electrode, circular insulating tapes are located at the outer edges of the upper electrode and the lower electrode, a circular reverse osmosis membrane is provided at the middle of the circular insulating tape, the upper electrode, lower electrode, circular insulating tapes and circular reverse osmosis membrane form an enclosed chamber which is filled with solid sodium chloride, and cotton yarns are packed among the upper resin backing plate, lower resin backing plate, circular insulating tapes and the inner walls of water permeable perforated pipes. The upper electrode is provided with an electrode lead which passes through the columnar insulator, the lower electrode and the lower resin backing plate and goes out from the tail connecting end.