公开(公告)号：US11131172B2

公开(公告)日：2021-09-28

申请号：US16759733

申请日：2018-10-29

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

Inventor： Baiquan Lin ,  Yang Zhao ,  Wei Yang ,  Qingzhao Li

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

Abstract: A method for extracting gas by fracturing a coal seam through a combination of hydraulic slotting and multi-stage combustion impact wave comprises 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 (nitrogen gas) or CO2 (carbon dioxide gas) storage space, 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：US10816312B2

公开(公告)日：2020-10-27

申请号：US16632883

申请日：2018-10-29

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

Inventor： Wei Yang ,  Baiquan Lin ,  Changzheng Lu ,  Ru Jia ,  Minghua Lin

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

Abstract: 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：US10808514B2

公开(公告)日：2020-10-20

申请号：US16632885

申请日：2018-10-29

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

Inventor： Baiquan Lin ,  Yang Zhao ,  Wei Yang

IPC: E21B43/26 ,  E21F7/00

Abstract: 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：US10895120B2

公开(公告)日：2021-01-19

申请号：US16642378

申请日：2018-10-29

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

Inventor： Wei Yang ,  Baiquan Lin ,  Minghua Lin ,  Ru Jia ,  Changzheng Lu

IPC: E21B21/015 ,  E21F5/20 ,  E21B21/01

Abstract: A dust suction hood includes a tapered outer cover, a cylindrical outer cover, a tapered inner baffle plate disposed in the tapered outer cover, and a first blocking member matched with an opening in the other end of the cylindrical outer cover. A top opening of the tapered outer cover is matched with an opening in one end of the cylindrical outer cover. A side wall opening of the cylindrical outer cover serves as a dust outlet. A first gap is formed in the tapered outer cover. A first dust suction port is formed between bottom openings of the tapered inner baffle plate and the tapered outer cover. A first drill pipe connecting port is formed in the first blocking member. A drill pipe of the mine drill passes through the first drill pipe connecting port to penetrate the dust suction hood on the drill pipe.

公开(公告)号：US10413911B2

公开(公告)日：2019-09-17

申请号：US15549175

申请日：2016-12-15

Applicant: CHINA UNIVERSITY OF MINING AND TECHNOLOGY

Inventor： Boquan Lin ,  Tong Liu ,  Wei Yang ,  Ting Liu ,  He Li ,  Zhanbo Huang ,  Rui Wang

IPC: B03B7/00 ,  E21C41/18 ,  B03B9/00 ,  E21F17/00 ,  E21B43/00

Abstract: The present invention relates to a method for sorting and utilizing coal and rock for a coal and rock combined mining face, and is especially applicable to the sorting and utilization of coal and rock mined from a coal and rock combined mining face when an extremely thin coal seam is used as a protective layer in combined mining of multiple coal seams. Underground gangue transport, storage and filling systems are directly established underground to convey a large amount of coal and gangue mined from the coal and rock mining face to an underground sorting and washing chamber for efficient separation of the coal and the gangue, sorted gangue is crushed and then filled in a mined-out area of a protected layer, thus realizing the environment-friendly cut and fill mining of the protective layer while the gangue is not lifted, and effectively preventing the ground subsidence caused by combined mining of multiple coal seams; sorted middlings are conveyed to a gangue power plant on the ground for power generation through a main conveying system, so that the pressure on mine coal quality is alleviated when benefits are created in the power plant, and thus the average ash content of commercial coal is reduced, and the selling price is increased. The method provided by the invention realizes the efficient utilization of coal and rock while realizing the efficient separation of coal and gangue, and has remarkable economic and social benefits and excellent promotional value.

公开(公告)号：US12078034B2

公开(公告)日：2024-09-03

申请号：US18027605

申请日：2021-12-27

Applicant: CHINA UNIVERSITY OF MINING AND TECHNOLOGY

Inventor： Wei Yang ,  Zening Wei ,  Cheng Zhai ,  Yihan Wang ,  Wenyuan Wang ,  Wenxiao Zhang

IPC: E21B34/06 ,  E21B43/00 ,  E21B43/1185 ,  E21B43/248 ,  E21B43/263 ,  E21B49/00 ,  G01N33/00 ,  E21B7/04

CPC classification number: E21B43/006 ,  E21B34/066 ,  E21B43/1185 ,  E21B43/248 ,  E21B43/263 ,  E21B49/00 ,  G01N33/0027 ,  E21B7/046

Abstract: A method for shale gas exploitation includes performing horizontal drilling operation on an area to be constructed, forming a crack around a horizontal drill hole wall by shaped charge perforation; expanding the crack around a horizontal hole hydraulic fracturing, and extracting methane gas after a fracturing fluid is discharged; after methane gas is reduced, performing in-situ combustion explosion fracturing on the methane involved in horizontal drilling; thereafter continuing to expand the crack in the horizontal drill hole such that methane continues to seep out, and continuing extracting methane; repeating combustion explosion fracturing and extraction operations, so as to increase combustion explosion cracking permeability, and greatly enhance the exploitation effect of shale gas. The method is suitable for fracturing reconstruction of unconventional oil and gas reservoirs such as shale gas reservoirs, coal seam gas reservoirs and tight sandstone gas reservoirs.

公开(公告)号：US10472963B2

公开(公告)日：2019-11-12

申请号：US16097828

申请日：2017-12-01

Applicant: China University of Mining and Technology

Inventor： Baiquan Lin ,  Tong Liu ,  Ting Liu ,  Wei Yang ,  He Li ,  Zhanbo Huang ,  Rui Wang ,  Yihan Wang

IPC: E21F7/00

Abstract: 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：US10280686B2

公开(公告)日：2019-05-07

申请号：US15548060

申请日：2016-03-31

Applicant: CHINA UNIVERSITY OF MINING AND TECHNOLOGY

Inventor： Boquan Lin ,  Tong Liu ,  Yabin Gao ,  He Li ,  Zhanbo Huang ,  Rui Wang ,  Wei Yang

IPC: E21B7/18 ,  E21F7/00 ,  E21B7/04

Abstract: A method of performing coupled drilling, flushing, and slotting operations on a coal seam, which has a high gas content and prone to bursts, is described herein. The method is aimed to relieve pressure and increase permeability when drilling a through-seam borehole to pre-drain gas belts in a coal mine roadway. The pressure relief and permeation method of the present invention adjusts the water jet water inlet pressure in different stages according to the different positions of the drilling construction, and controls the water during drilling. At drilling stage, the jets are respectively subjected to low-pressure water flow drilling and medium-pressure water flow flushing. When withdraw drilling, the high-pressure water flow slotting is carried out. By doing so, the pressure is relieved in a low, medium, high stepwise manner.