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.