公开(公告)号：US11459849B1

公开(公告)日：2022-10-04

申请号：US17730031

申请日：2022-04-26

申请人： CHINA UNIVERSITY OF MINING AND TECHNOLOGY, BEIJING ,  Shaanxi Coal Caojiatan Mining Co., Ltd.

发明人： Yifan Zeng ,  Qiang Wu ,  Zhaolai Hua ,  Rui Wang ,  Zhenzhong Pang ,  Lu Wang ,  Yang Lv ,  Xin Du ,  Kai Pang ,  Aoshuang Mei

IPC分类号： E21B33/13 ,  E21B27/00 ,  E21F17/00

摘要： A sealing method for a drilled hole in three zones of overburden comprises: blocking the fissure zone and the caving zone with at least one filling bag; and transporting prepared cement slurry to the drilled hole through a hollow drill pipe, so as to block the curved subsidence zone. The three zones of overburden comprise a fissure zone, a caving zone and a curved subsidence zone.

公开(公告)号：US12091972B1

公开(公告)日：2024-09-17

申请号：US18596373

申请日：2024-03-05

申请人： CHINA UNIVERSITY OF MINING AND TECHNOLOGY, BEIJING

发明人： Yifan Zeng ,  Aoshuang Mei ,  Qiang Wu ,  Huaming Wei ,  Yashuai Cui ,  Shihao Meng ,  Weihong Yang ,  Kai Pang ,  Liang Yang ,  Yidi Xing

IPC分类号： E21C41/18 ,  E21C39/00 ,  E21F17/18

CPC分类号： E21C41/18 ,  E21C39/00 ,  E21C2100/00 ,  E21F17/18

摘要： Disclosed are a method and a related device for determining a development status of a separation layer in a coal mine. The method includes: obtaining surface subsidence variation data of the coal mine within a preset time interval, rock stress variation data of a caving zone of the coal mine and water pressure variation data; determining a height decrease of the caving zone based on the rock stress variation data and the water pressure variation data; and determining the development status of the separation layer of the coal mine based on the height decrease and the surface subsidence variation data.

公开(公告)号：US12129620B1

公开(公告)日：2024-10-29

申请号：US18600416

申请日：2024-03-08

申请人： CHINA UNIVERSITY OF MINING AND TECHNOLOGY, BEIJING

发明人： Yifan Zeng ,  Weihong Yang ,  Qiang Wu ,  Kai Pang ,  Xinjiang Wei ,  Xue Liu ,  Xuan Xiao ,  Aoshuang Mei ,  Shihao Meng ,  Chao Yu

IPC分类号： E21B33/13 ,  E02D3/12

CPC分类号： E02D3/12 ,  E02D2250/003 ,  E21B33/13

摘要： Disclosed is a method for repairing an aquifer in a coal mine area by grouting, including: drilling a survey hole in a ground area corresponding to a water inflow position from ground surface to a caving zone in a goaf; determining a target layer for grouting in the survey hole based on drilling data collected from the survey hole while drilling; changing the survey hole to a grouting hole; measuring a first water level from the grouting hole; grouting through the grouting hole; changing the grouting hole to an observation hole; measuring a second water level from the observation hole; and determining a water retention level based on the first water level and the second water level.

公开(公告)号：US11781429B1

公开(公告)日：2023-10-10

申请号：US18332606

申请日：2023-06-09

申请人： CHINA UNIVERSITY OF MINING AND TECHNOLOGY, BEIJING ,  University of Mining and Technology-Beijing Inner Mongolia Research Institute

发明人： Yifan Zeng ,  Qiang Wu ,  Weihong Yang ,  Zhaolai Hua ,  Yanping Miao ,  Lu Wang ,  Kai Pang ,  Lei Yang ,  Aoshuang Mei ,  Shihao Meng ,  Han Bao ,  Xue Liu ,  Xuan Xiao

IPC分类号： E21D11/10 ,  E21D11/38 ,  E21B33/13

CPC分类号： E21D11/38 ,  E21B33/13 ,  E21D11/10

摘要： A method for blocking mine water inrush includes: grouting first slurry into an interface between the quaternary aquifer and the weathered bedrock aquifer in a fracture grouting manner until a first preset condition is met; forming a first water-resisting cushion after the first slurry is solidified; drilling a curve branch drill hole in the surface horizon downward; grouting second slurry into the curve branch drill hole in a downward grouting manner until a second preset condition is met; forming a second water-resisting cushion after the second slurry is solidified; grouting third slurry onto a top of the first water-resisting cushion in an upward grouting manner until a third preset condition is met; forming a third water-resisting cushion after the third slurry is solidified; wherein the third water-resisting cushion is located on the top of the first water-resisting cushion.

公开(公告)号：US12055040B1

公开(公告)日：2024-08-06

申请号：US18413509

申请日：2024-01-16

申请人： CHINA UNIVERSITY OF MINING AND TECHNOLOGY, BEIJING

发明人： Yifan Zeng ,  Weihong Yang ,  Qiang Wu ,  Xuan Xiao ,  Kai Pang ,  Xinjiang Wei ,  Xue Liu ,  Han Bao

IPC分类号： E21B7/06

CPC分类号： E21B7/068 ,  E21B7/061 ,  E21B7/064

摘要： A curvature controllable directional drilling device is disclosed. The drilling device includes: a drill bit, a power unit, a rigid bending unit, a bendable outer wall, and a wedge deflection tool. The power unit is to provide a rotary power to the drill bit. The rigid bending unit is set between the drill bit and the power unit, to bend on a basis of an initial curvature under an external force. The bendable outer wall is set on an outer side of the power unit and the rigid bending unit. The wedge deflection tool is set at one end of the bendable outer wall near the drill bit, to receive a reaction force and bend the rigid bending unit. By a coordination between the wedge deflection tool and the power unit, a drilling direction of the drill bit connected to the rigid bending unit can be adjusted.