公开(公告)号：US12078034B2

公开(公告)日：2024-09-03

申请号：US18027605

申请日：2021-12-27

Applicant: CHINA UNIVERSITY OF MINING AND TECHNOLOGY

Inventor： Wei Yang ,  Zening Wei ,  Cheng Zhai ,  Yihan Wang ,  Wenyuan Wang ,  Wenxiao Zhang

IPC: E21B34/06 ,  E21B43/00 ,  E21B43/1185 ,  E21B43/248 ,  E21B43/263 ,  E21B49/00 ,  G01N33/00 ,  E21B7/04

CPC classification number: E21B43/006 ,  E21B34/066 ,  E21B43/1185 ,  E21B43/248 ,  E21B43/263 ,  E21B49/00 ,  G01N33/0027 ,  E21B7/046

Abstract: A method for shale gas exploitation includes performing horizontal drilling operation on an area to be constructed, forming a crack around a horizontal drill hole wall by shaped charge perforation; expanding the crack around a horizontal hole hydraulic fracturing, and extracting methane gas after a fracturing fluid is discharged; after methane gas is reduced, performing in-situ combustion explosion fracturing on the methane involved in horizontal drilling; thereafter continuing to expand the crack in the horizontal drill hole such that methane continues to seep out, and continuing extracting methane; repeating combustion explosion fracturing and extraction operations, so as to increase combustion explosion cracking permeability, and greatly enhance the exploitation effect of shale gas. The method is suitable for fracturing reconstruction of unconventional oil and gas reservoirs such as shale gas reservoirs, coal seam gas reservoirs and tight sandstone gas reservoirs.

公开(公告)号：US10472963B2

公开(公告)日：2019-11-12

申请号：US16097828

申请日：2017-12-01

Applicant: China University of Mining and Technology

Inventor： Baiquan Lin ,  Tong Liu ,  Ting Liu ,  Wei Yang ,  He Li ,  Zhanbo Huang ,  Rui Wang ,  Yihan Wang

IPC: E21F7/00

Abstract: 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.