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：US20190323340A1

公开(公告)日：2019-10-24

申请号：US16475606

申请日：2018-07-13

Applicant: SHANDONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Wei LU ,  Zhen LIU ,  Guansheng QI ,  Jinliang LI ,  Dongling SUN ,  Weimin CHENG ,  Dong WANG ,  Chuanrui QIN

IPC: E21B47/06 ,  E21F17/00

Abstract: Provided are a dynamically self-balancing pressurized borehole sealing apparatus and a method thereof for coal seam gas pressure measurement, wherein the dynamically self-balancing pressurized borehole sealing apparatus for coal seam gas pressure measurement comprises a pressure measuring tube arranged in a borehole, one end of the pressure measuring tube is provided with a pressure measuring unit for measuring a gas pressure, the pressure measuring tube is surrounded and wrapped with an expansion airbag, the pressure measuring tube is provided with a pressure introducing hole communicating with the expansion airbag, both sides of the expansion airbag on the pressure measuring tube are surrounded and wrapped with a front borehole sealing airbag and a rear borehole sealing airbag respectively, a gel injection chamber is reserved between the three of the front borehole sealing airbag, the rear borehole sealing airbag and the expansion airbag and an inner side of the borehole, the gel injection chamber is filled with a sealing gel body, the front borehole sealing airbag and the rear borehole sealing airbag are connected to an inflating unit outside the borehole through an inflating pipe, and the gel injection chamber is connected to a gel injecting unit outside the borehole through a gel injection pipe. The present disclosure has the following benefits: a coal seam borehole sealing effect of coal seam gas pressure measurement is effectively improved and the coal seam gas pressure can be measured accurately.

公开(公告)号：US20200080382A1

公开(公告)日：2020-03-12

申请号：US16616790

申请日：2018-12-25

Applicant: SHANDONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Gang WANG ,  Weimin CHENG ,  Xiaohua ZHOU ,  Lulu SUN ,  Chenghao JIANG ,  Zhen LIU

IPC: E21B7/18 ,  E21B43/114 ,  E21B33/127 ,  E21B43/26 ,  E21C37/12

Abstract: Provided are a drill-power-based directional hydraulic fracturing system for downhole quick slotting and a method thereof. The directional hydraulic fracturing system includes a water injection pump, a high pressure rubber pipe arranged on the water injection pump is in communication with a drill, a dedicated sealing drill rod for hydraulic fracturing is arranged on the drill, a front segment of the drill rod may be connected with a directional borehole sealer through threads and a sealing ring is provided at the threaded connection. The main steps include drilling, slotting, borehole sealing and fracturing. Firstly, a drill-cut integrated tool is installed at a front end of the drill rod. After drilling is completed, hydraulic slotting, permeability improvement and pressure relief are performed without changing a drill bit. After slotting is completed, the drill bit is retreated, and the directional borehole sealer is installed and pushed to a predetermined position for efficiency sealing. After sealing is completed, high pressure water injection fracturing is performed to increase fissure density and scope with “high pressure penetration” as main. Thus, water injection for the coal seam with high ground pressure and low porosity is realized. In this way, coal bumps are effectively prevented, the powder dust concentration is reduced and the disasters such as gas and fire are prevented.

公开(公告)号：US20200217202A1

公开(公告)日：2020-07-09

申请号：US16624984

申请日：2018-07-13

Applicant: SHANDONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Wei LU ,  Qianting HU ,  Guansheng QI ,  Weimin Cheng ,  Jinliang LI ,  Dong WANG ,  Zhen LIU

IPC: E21F1/04 ,  E21B17/10

Abstract: Disclosed is a ground wellhole dedicated protective pipe for gas extraction of a mining-induced area. The ground wellhole dedicated protective pipe for gas extraction of a mining-induced area is disposed inside a ground wellhole for gas extraction of the mining-induced area and the ground wellhole dedicated protective pipe for gas extraction of a mining-induced area includes a casing and a chain that is disposed inside the casing and slidable relative to the casing, wherein the chain includes a plurality of chain drums and connecting pieces movably connecting the adjacent chain drums, and a plurality of air holes are opened in the chain drum along an axial direction of the chain drum. Beneficial effects include as follows: the ground wellhole dedicated protective pipe for gas extraction of a mining-induced area is capable of resisting a change and a failure of the casing caused by a shearing force, a squeezing force and a stretching force due to a displacement of a rock stratum simultaneously, and ensures the gas passes under any one or more forces no matter what displacement and forces occur to a protection region inside the ground wellhole for gas extraction of the mining-induced area, and thus the pipe has versatility, economy and applicability compared with traditional protection methods and apparatuses.

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.