The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 16, 2023
Filed:
Oct. 14, 2021
Taiyuan University of Technology, Shanxi, CN;
Zhen Li, Shanxi, CN;
Xiaojun Yang, Shanxi, CN;
Peng Yang, Shanxi, CN;
Zhilong Fang, Shanxi, CN;
Jiapeng Zhao, Shanxi, CN;
Weichao Fan, Shanxi, CN;
Chunwang Zhang, Shanxi, CN;
Wenpu Li, Shanxi, CN;
Haina Jiang, Shanxi, CN;
Taiyuan University of Technology, Shanxi, CN;
Abstract
A multi-level cross-district surface well pattern deployment method is provided. Firstly, a horizontal well is drilled from a location on a land surface corresponding to a junction Hof a district rise coal pillar of the first district Cin 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 Hof a level coal pillar between the first and second levels, and the district rise coal pillar of the first district Cin 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 m/min.