公开(公告)号：US20220251956A1

公开(公告)日：2022-08-11

申请号：US17501129

申请日：2021-10-14

Applicant: TAIYUAN UNIVERSITY OF TECHNOLOGY

Inventor： Zhen LI ,  Xiaojun Yang ,  Peng Yang ,  Zhilong Fang ,  Jiapeng Zhao ,  Weichao Fan ,  Chunwang Zhang ,  Wenpu Li ,  Haina Jiang

IPC: E21F7/00 ,  E21B43/00

Abstract: A multi-level cross-district surface well pattern deployment method is provided. Firstly, a first horizontal well is drilled from a location on a land surface corresponding to a junction H1 of a district rise coal pillar of the first district C1 in a first level and an upper mine field boundary coal pillar. A multilateral well is drilled from a location on the land surface corresponding to a junction H3 of a level coal pillar between the first and second levels, and the district rise coal pillar of the first district C1 in the first level. Liquid nitrogen is injected for permeability improvement after a gas drainage quantity decreases to 20% of an initial quantity. Gas drainage is repeated multiple times until the drainage quantity of coal bed methane through a gas drainage pipe of the horizontal pipe is reached 3 m3/min.

公开(公告)号：US20200088907A1

公开(公告)日：2020-03-19

申请号：US16234497

申请日：2018-12-27

Applicant: Taiyuan University of Technology

Inventor： Guorui FENG ,  Chunwang ZHANG ,  Zhixin JIN ,  Rui GAO ,  Shengyong HU ,  Zhen LI ,  Jiaqing CUI ,  Cheng SONG ,  Xiaohong NIU

IPC: G01V99/00 ,  G05B11/01 ,  G05D16/20 ,  E21C39/00

Abstract: A three-dimensional analog simulation test system for gas-liquid countercurrent in an abandoned mine goaf includes a three-dimensional analog simulation device configured to simulate an analog environment of gas-liquid countercurrent in an abandoned mine goaf, a gas supply system, an automatic water pressure control system and a hydraulic loading system. The three-dimensional analog simulation device includes a reaction frame and a three-dimensional analog simulation chamber. The reaction frame includes a beam, a base and a column for connecting the beam and the base. The three-dimensional analog simulation chamber is arranged inside the reaction frame. The test system can be used to simulate the gas-liquid countercurrent in an abandoned mine goaf so as to study the evolution of water accumulation and gas enrichment in long-term abandonment of closed mines and the migration evolution rules of gas-liquid two-phase in abandoned mines with high gas density.

公开(公告)号：US20190168357A1

公开(公告)日：2019-06-06

申请号：US16208592

申请日：2018-12-04

Applicant: Taiyuan University of Technology

Inventor： Zhixin JIN ,  Chunwang ZHANG ,  Guorui FENG ,  Xuanmin SONG ,  Shengyong HU ,  Yujiang ZHANG ,  Tingye QI ,  Zhen LI

IPC: B24B41/06 ,  B24B7/16 ,  B24B7/22 ,  B24B7/08

Abstract: A rock sanding device includes a base, a bottom sanding plate, an adjustable connecting rod, an elastic loader, a connector, a side sanding brush, a top sanding plate, an inner rod, a prong and a drill rod. The top of the drill rod is fixedly connected with the rotating shaft of the external water drilling rig and the external water drilling rig has a water inlet joint to introduce water into the drill rod. The inner rod and drill rod are connected and fixed coaxially, and the bottom of the drill rod is symmetrically welded with four prongs. The rock specimen is placed in the center of the side sanding brush. The top sanding plate and the bottom sanding plate are provided in the top side and bottom side of the rock specimen, respectively.