公开(公告)号：US20210148205A1

公开(公告)日：2021-05-20

申请号：US16759733

申请日：2018-10-29

申请人： CHINA UNIVERSITY OF MINING AND TECHNOLOGY ,  XUZHOU BOAN SCIENCE & TECHNOLOGY DEVELOPMENT CO.,LTD

发明人： Baiquan LIN ,  Yang ZHAO ,  Wei YANG ,  Qingzhao LI

IPC分类号： E21B43/247 ,  E21B43/00 ,  E21B43/16 ,  E21B43/26

摘要： The disclosure provides a method for extracting gas by fracturing a coal seam through a combination of hydraulic slotting and multi-stage combustion impact wave, comprising first cutting slots in an impact borehole using a hydraulic slotting equipment to perform pressure relief and permeability enhancement on a coal seam and enlarge a N2 or CO2 storage space, then injecting a large amount of N2 or CO2 into the borehole by means of a high pressure gas cylinder and a pressure reducing valve through a gas injection and extraction pipe, then injecting a certain amount of methane and dry air into a high-temperature and high-pressure combustion chamber by means of the high pressure gas cylinder and the pressure reducing valve, so that the gases are mixed and combusted to form high-temperature and high-pressure impact wave to push a piston to compress the N2 or CO2, thereby generating a large number of factures on the coal seam around the impact borehole under guiding action of the slots. The impact wave is repeatedly generated to form a multi-stage impact, and the impact of the next stage is based on the impact of the previous stage, so that the fractures on the coal seam around the borehole are further expanded and run through. After the N2 or CO2 is compressed by means of the multi-stage impact, more fracture networks are formed on the coal seam around the borehole under the guiding action of the slots and the fractures, thereby enhancing the borehole-based efficient gas extraction.

公开(公告)号：US20200182597A1

公开(公告)日：2020-06-11

申请号：US16632883

申请日：2018-10-29

申请人： China University of Mining and Technology ,  XUZHOU BOAN SCIENCE & TECHNOLOGY DEVELOPMENT CO.,LTD

发明人： Wei YANG ,  Baiquan LIN ,  Changzheng LU ,  Ru JIA ,  Minghua LIN

IPC分类号： F42D1/18 ,  E21C37/00 ,  E21B33/127 ,  E21B34/06

摘要： An integrated hole sealing, device includes a capsule plug, an outer capsule having a first hole site, an inner capsule having a second hole site, a capsule water injection pipe, a borehole water injection pipe and a tapered plug. Two ends of the outer capsule and the inner capsule are respectively fixed on the capsule plug and the tapered plug. The capsule plug, the tapered plug, the outer capsule and the inner capsule form a closed hollow cylindrical cavity. A middle part of the inner capsule is a hollow pipeline, and two ends thereof respectively correspond to the first and second hole sites. The borehole water injection pipe passes through the hollow cylindrical cavity. A part, located in the hollow cylindrical cavity, of the borehole water injection pipe is telescopically wound outside the inner capsule. The capsule water injection pipe passes through the capsule plug and extends into the hollow cylindrical cavity.

公开(公告)号：US20200182033A1

公开(公告)日：2020-06-11

申请号：US16632885

申请日：2018-10-29

申请人： China University of Mining and Technology ,  XUZHOU BOAN SCIENCE & TECHNOLOGY DEVELOPMENT CO.,LTD

发明人： Baiquan LIN ,  Yang ZHAO ,  Wei YANG

IPC分类号： E21B43/26 ,  E21F7/00

摘要： A multi-stage combustion impact wave coal mass cracking and heat injection alternating intensified gas extracting method is provided. A large amount of N2 or CO2 is injected into a drill hole by a heat injection and gas injection extracting pipe and by a high-pressure gas cylinder and a reducing valve, then a certain amount of methane and dry air are injected into a high-temperature and high-pressure combustion chamber by the high-pressure gas cylinder and the reducing valve, to be mixed and combusted to form high-temperature and high-pressure impact wave. High-temperature vapour is injected into the drill holes by the heat injection and gas injection extracting pipe to promote desorption of the coal masses.

公开(公告)号：US20210040822A1

公开(公告)日：2021-02-11

申请号：US16090080

申请日：2017-12-04

申请人： CHINA UNIVERSITY OF MINING AND TECHNOLOGY

发明人： Chuanjie ZHU ,  Baiquan LIN ,  Zishan GAO ,  Ximiao LU

IPC分类号： E21B43/00 ,  E21B49/00 ,  E21B47/10 ,  E21B7/04

摘要： A method for precisely extracting coal-mine gas is suitable for improving the accuracy of design and construction of coal-mine gas extraction and ensuring the efficiency of borehole extraction. In the method, a gyroscope and an endoscopic camera are first used to investigate coal-seam strike trend, coal-seam dip trend, and coal-seam thickness data of a to-be-extracted area. According to gas extraction standard requirements of a to-be-extracted area, boreholes are then designed and constructed, and trajectories of boreholes are tracked to obtain a correspondence relationship between designed borehole parameters and actual borehole trajectory parameters. Next, drilling parameters are adjusted according to the correspondence relationship between the designed borehole parameters and the actual borehole parameters to construct boreholes at predetermined borehole locations. Subsequently, the boreholes are connected to an extraction pipeline, and gas extraction flow rates and gas extraction amounts per meter of the boreholes are observed. Eventually, other boreholes are designed and constructed according to the adjusted borehole construction parameters and extraction data. After being constructed, the boreholes are connected to perform gas extraction.

公开(公告)号：US20190145260A1

公开(公告)日：2019-05-16

申请号：US16098131

申请日：2017-12-01

申请人： China University of Mining and Technology

发明人： Baiquan LIN ,  Tong LIU ,  Ting LIU ,  Wei YANG ,  He LI ,  Rui WANG ,  Zheng WANG

IPC分类号： E21F7/00

摘要： A method for constructing networked preferential gas migration pathways and diverting and extracting gas. The method proposes that a fracture generation hole, a fracture guidance and development hole, a lateral rupture hole, and a fracture connection hole are respectively constructed in a roof in roadways on two sides of a working face in advance of an advance stress change area. Artificial guided fractures are actively constructed and formed inside the hard roof. Under a mining-induced stress effect, the artificial guided fractures and mining-induced fractures intersect with and are connected to each other to form networked preferential gas migration pathways. Meanwhile, boreholes for artificial guided fractures accelerate roof fracturing to form a rupture bed separation fracture area in a roof. Gas flows and migrates in a timely and efficient manner along networked fracture pathways and concentrates in the rupture bed separation fracture area in the roof.

公开(公告)号：US20190145259A1

公开(公告)日：2019-05-16

申请号：US16097828

申请日：2017-12-01

申请人： China University of Mining and Technology

发明人： Baiquan LIN ,  Tong LIU ,  Ting LIU ,  Wei YANG ,  He LI ,  Zhanbo HUANG ,  Rui WANG ,  Yihan WANG

IPC分类号： E21F7/00

CPC分类号： E21F7/00

摘要： A method for stepwise construction of a preferential gas migration pathway at a stope in a coal seam. First, a gas migration pathway is preliminarily formed at a stope depending on a mining effect of mining in a first mined seam. construction and stabilization method of gob-side entry retaining in deep strata, and a method of manual-guided pre-fracturing boreholes are then used to perform active construction respectively in external space and the outside of coal-rock mass to form preferential gas migration pathways. Eventually, under the effect of mining-induced stress, a system of preferential gas migration pathways connected to each other at the stope is further formed.

公开(公告)号：US20180209259A1

公开(公告)日：2018-07-26

申请号：US15321891

申请日：2015-12-22

申请人： CHINA UNIVERSITY OF MINING AND TECHNOLOGY

发明人： Baiquan LIN ,  Quanle Zou ,  Ting Liu ,  Chang Guo ,  Chuanjie Zhu ,  Jia Kong ,  Fazhi Yan ,  Hao Yao ,  Yidou Hong

IPC分类号： E21B43/267 ,  E21B43/24 ,  E21F7/00 ,  E21B36/00

CPC分类号： E21B43/267 ,  E21B36/006 ,  E21B43/114 ,  E21B43/2405 ,  E21F7/00

摘要： A gas extraction method in which high energy gas fracturing technology is used to form a fracture network in a thermal injection borehole. Then high-pressure, cyclically temperature-changing steam is injected into the borehole using a spinning oscillating-pulse jet nozzle to form oscillating superheated steam, alternatingly impacting and heating the coal body. The high energy gas forms a fracture network that provides channels for passage of the superheated steam, while oscillating changes in steam temperature and pressure also promote crack propagation and perforation of the coal body; the combined effect of alternation of the two enhances gas desorption and extraction efficiency.

公开(公告)号：US20180112505A1

公开(公告)日：2018-04-26

申请号：US15325662

申请日：2015-12-28

申请人： CHINA UNIVERSITY OF MINING AND TECHNOLOGY

发明人： Baiquan LIN ,  Fazhi YAN ,  Chuanjie ZHU ,  Chang GUO ,  Quanle ZOU ,  Ting LIU ,  Yidu HONG ,  Hao YAO

IPC分类号： E21B43/26 ,  E21B43/30

CPC分类号： E21B43/26 ,  E21B43/30

摘要： A method for permeability improvement for a downhole coal seam by directional fracturing with pulsed detonation waves, which is applicable to gas control in coal seam areas with high gas concentration and low air permeability. The permeability improvement method is as follows: first, drilling a pulsed detonation borehole and pulsed detonation guide boreholes from a coal roadway to a coal seam respectively; then, pushing a positive electrode connected to a positive output side of an explosion-proof high-voltage electrical pulse generator to the bottom of the pulsed detonation borehole and pushing a negative electrode connected to a negative output side of the explosion-proof high-voltage electrical pulse generator to the bottom of the pulsed detonation guide borehole; connecting the pulsed detonation borehole and the pulsed detonation guide boreholes to an extraction pipeline for gas extraction, after electrical pulsed detonation fracturing for the coal seam is carried out. The method disclosed in the present invention utilizes the high instantaneous energy provided by electrical pulsed detonation waves to fracture a coal mass, so as to form a fissure network in the coal mass between the pulsed detonation borehole and the pulsed detonation guide boreholes; thus, the air permeability coefficient of the coal mass can be increased by 200-400 times, the effective influence scope of gas extraction of a single borehole for gas extraction can be enlarged by 3-4 times, the extracted gas volume from the borehole can be increased by 3-8 times, and the coal seam gas pre-extraction time can be shortened effectively.

公开(公告)号：US20180209255A1

公开(公告)日：2018-07-26

申请号：US15322457

申请日：2015-12-22

申请人： CHINA UNIVERSITY OF MINING AND TECHNOLOGY

发明人： Baiquan LIN ,  Chang GUO ,  Quanle ZOU ,  Ting LIU ,  Chuanjie ZHU ,  Jia KONG ,  Fazhi YAN ,  Hao YAO ,  Yidu HONG

IPC分类号： E21B43/24 ,  E21B7/18 ,  E21B7/28

CPC分类号： E21B43/24 ,  E21B7/18 ,  E21B41/0078 ,  E21B43/26 ,  E21F7/00

摘要： A method for combining integrated drilling and slotting with oscillating thermal injection to enhance coalbed gas extraction, applicable to managing gas extraction from microporous, low-permeability, high-adsorption coal seam areas. A number of slots are formed within a thermal injection/extraction borehole by means of integrated drilling and slotting technology; a steam generator, is then used to three high-pressure, cyclically temperature-changing steam into said borehole; the steam passing through a spinning, oscillating-pulse jet nozzle forms an oscillating superheated steam, heating the coal body. The present method overcomes the limitations of simple permeability-increasing techniques, the slotting by means of hydraulic. pressure significantly increasing the pressure relief range of a single borehole and forming a fracture network that provides channels for passage of the superheated steam, while oscillating variation in steam temperature and pressure also promote crack propagation and perforation of the coal body; the combined effect of the two enhances the efficiency of gas desorption and extraction.

公开(公告)号：US20160136575A1

公开(公告)日：2016-05-19

申请号：US14898323

申请日：2014-11-05

申请人： CHINA UNIVERSITY OF MINING AND TECHNOLOGY

发明人： Baiquan LIN ,  Qingzhao LI

IPC分类号： B01D53/86 ,  E21F7/00

CPC分类号： B01D53/86 ,  B01D53/44 ,  B01D2251/11 ,  B01D2255/20715 ,  B01D2255/2073 ,  B01D2255/20738 ,  B01D2255/2092 ,  B01D2258/06 ,  E21F7/00

摘要： Disclosed is a self-regenerative integrated device for the synergetic oxidation of low-concentration gas and ventilation gas in a coal mine. The integrated device comprises a metal shell (5). A honeycomb ceramic oxidation bed (13) is arranged within the metal shell (5) and divided into a regenerative section (40) and an oxidation section (41) by a heat exchange chamber (14). A first cavity between the regenerative section (40) and the inner wall of the metal shell (5) is divided into a first inlet chamber (6) and an exhaust chamber (8) by an inlet partition plate (7), a second cavity between the oxidation section (41) and the inner wall of the metal shell (5) is divided into a second inlet chamber (22) and a mixing chamber (20) by a partition plate (21) for averaging gas, and a plurality of gas nozzles (28) are provided on the partition plate (21) for averaging gas. An internal heat exchanger (35) is arranged within the heat exchange chamber (14), and a heat exchanger inlet (16) and a heat exchanger outlet (15) of the internal heat exchanger (35) are respectively connected with a boiler drum (18). The first inlet chamber (6) is connected with an inlet (1) of the ventilation gas through a proportional control valve (38), the second inlet chamber (22) is connected with an inlet (31) for extracting the low-concentration gas through a proportional mixer (33), and the proportional control valve (38) is connected with the proportional mixer (33) through a connecting pipeline (36). The two ends of an inlet preheating pipe (9) on the honeycomb ceramic oxidation bed (13) are respectively communicated with the first inlet chamber (6) and the mixing chamber (20).

摘要翻译： 公开了一种用于煤矿中低浓度气体和通风气体的协同氧化的自再生综合装置。 集成装置包括金属壳（5）。 蜂窝陶瓷氧化床（13）设置在金属壳体（5）内，并由热交换室（14）分为再生部分（40）和氧化部分（41）。 再生部分（40）和金属壳体（5）的内壁之间的第一空腔通过入口隔板（7）分成第一入口室（6）和排气室（8），第二空腔 在氧化部分41和金属壳体5的内壁之间通过用于平均气体的隔板（21）将第二入口室（22）和混合室（20）分成多个， 气体喷嘴（28）设置在分隔板（21）上，用于平均气体。 内部热交换器（35）设置在热交换室（14）内，并且内部热交换器（35）的热交换器入口（16）和热交换器出口（15）分别与锅炉鼓（ 18）。 第一入口室（6）通过比例控制阀（38）与通气气体的入口（1）连接，第二入口室（22）与用于提取低浓度气体的入口（31）连接 通过比例混合器（33），比例控制阀（38）通过连接管道（36）与比例混合器（33）连接。 蜂窝陶瓷氧化床（13）上的入口预热管（9）的两端分别与第一入口室（6）和混合室（20）连通。