公开(公告)号：US20210154510A1

公开(公告)日：2021-05-27

申请号：US17258725

申请日：2018-12-30

Applicant: SHANDONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Xiangming HU ,  Weimin CHENG ,  Mingyue WU ,  Yanyun ZHAO ,  Wei LU ,  Biao KONG ,  Di XUE

IPC: A62D1/00 ,  C08K11/00 ,  C08K3/34 ,  C08K5/1545 ,  C08K3/26 ,  C08K3/40 ,  C08J3/11 ,  C08J3/24 ,  E21F5/08

Abstract: A plastic gel material for preventing spontaneous combustion of coal, including water, a crosslinking agent, a toughener, a coagulant, an aggregate and a water glass. The crosslinking agent (AlCit) is prepared by mixing a polyaluminum chloride solution and a citric acid solution then neutralizing the mixture with a sodium hydroxide solution. The coagulant is one or more of potassium bicarbonate, sodium bicarbonate, ammonium bicarbonate, sodium carbonate or glucono-δ-lactone (GDL). The toughener is one or more of pregelatinized starch, sodium alginate, carboxymethyl cellulose or polyacrylamide. The aggregate is coal ash or bentonite. The plastic gel has good water retention, toughness and inhibition performance, and helps avoid easy cracking and pulverization in inorganic silica gel consolidating bodies after losing water. The plastic gel can cover the surface of burning coal mass, reduce the temperature of the ignition source, heat radiation and production amount of CO, and have a fire extinguishing effect.

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：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.