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    METHOD OF PERFORMING COMBINED DRILLING, FLUSHING, AND CUTTING OPERATIONS ON COAL SEAM HAVING HIGH GAS CONTENT AND PRONE TO BURSTS TO RELIEVE PRESSURE AND INCREASE PERMEABILITY
    1.
    发明申请
    METHOD OF PERFORMING COMBINED DRILLING, FLUSHING, AND CUTTING OPERATIONS ON COAL SEAM HAVING HIGH GAS CONTENT AND PRONE TO BURSTS TO RELIEVE PRESSURE AND INCREASE PERMEABILITY 审中-公开

    公开(公告)号：US20170370156A1

    公开(公告)日：2017-12-28

    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

    CPC classification number: E21B7/18 ,  E21B7/046 ,  E21F7/00

    Abstract: The present invention relates to a “drilling-flushing-slotting” coupled pressure relief and permeability increasing method for a high gas outburst coal seam, which is more particularly suitable for the pressure relief and permeability increasing when gas of a roadway band of the high gas outburst coal seam is pre-extracted through crossing boreholes. On the basis of the crossing borehole pre-extraction measures for the coal seam gas, the hydraulic flushing and the hydraulic slotting are reasonably combined, and a “drilling-flushing-slotting” dedicated device is utilized to implement the coupled operation of “low pressure drilling-medium pressure flushing-high pressure slotting” in a borehole, so that the coal in the pre-extraction area is deformed and moved to form network cracks, passages are provided to the desorption flow of the gas, and the gas is easier to extract. The method can enlarge the single-hole pressure relief influence range, increase the gas permeability of the coal seam, improve the gas extraction efficiency, reduce the number of pre-extraction boreholes, shorten the pre-extraction time and have good applicability to the coal seams in different occurrence states. The present invention can reduce the number of the crossing boreholes by 32.5% and can reduce the length of each crossing borehole by 42.9%, is remarkable in coal roadway regional outburst eliminating effect, and obviously increases the tunneling speed.

    METHOD FOR CONSTRUCTING NETWORKED PREFERENTIAL GAS MIGRATION PATHWAYS AND DIVERTING AND EXTRACTING GAS
    2.
    发明申请
    METHOD FOR CONSTRUCTING NETWORKED PREFERENTIAL GAS MIGRATION PATHWAYS AND DIVERTING AND EXTRACTING GAS 审中-公开

    公开(公告)号：US20190145260A1

    公开(公告)日：2019-05-16

    申请号：US16098131

    申请日：2017-12-01

    Applicant: China University of Mining and Technology

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

    IPC: E21F7/00

    Abstract: 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.

    METHOD OF SORTING AND UTILIZING COAL AND ROCK FOR COAL AND ROCK Combined MINING FACE
    3.
    发明申请
    METHOD OF SORTING AND UTILIZING COAL AND ROCK FOR COAL AND ROCK Combined MINING FACE 有权

    公开(公告)号：US20180229245A1

    公开(公告)日：2018-08-16

    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

    CPC classification number: B03B7/00 ,  B03B9/005 ,  B07B2230/01 ,  E21B43/00 ,  E21C41/18 ,  E21F17/00

    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.

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