公开(公告)号：US11434731B1

公开(公告)日：2022-09-06

申请号：US17685932

申请日：2022-03-03

Applicant: China University of Mining and Technology

Inventor： Ning Luo ,  Cheng Zhai ,  Hanliang Liang ,  Yunchen Suo ,  Xiaolong Cao ,  Yishuo Yuan ,  Yabo Chai

IPC: E21B43/117 ,  E21B43/247 ,  C09K8/592

Abstract: An in-situ methane explosion shaped charge perforating device with a molecular sieve is provided and includes a body, an end of the body is fixedly connected to the molecular sieve, two sides of the molecular sieve are fixedly connected to two baffles respectively, each baffle is embedded with several first check valves inside, an end of the body far away from the molecular sieve is fixedly connected to a fixing plate, a center of the fixing plate is embedded with an ignition device, a bottom of the fixing plate is embedded with a concentration sensor, a portion of the fixing plate between the ignition device and the concentration sensor is formed with an air extracting hole, inner walls of a top and a bottom of the body are symmetrically embedded with second check valves, and the ignition device and the concentration sensor are electrically connected to an external controller.

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：US11932586B2

公开(公告)日：2024-03-19

申请号：US18354221

申请日：2023-07-18

Applicant: China University of Mining and Technology

Inventor： Ning Luo ,  Yabo Chai ,  Hanliang Liang ,  Haohao Zhang ,  Cheng Zhai ,  Jianan Zhou ,  Penglong Li

IPC: C06B25/34 ,  C06B23/00

CPC classification number: C06B25/34 ,  C06B23/001 ,  C06B23/006 ,  C06B23/009

Abstract: A liquid explosive for in-situ explosive fracturing in low-permeability oilfields and application thereof are provided. The liquid explosive includes raw materials in parts by mass: a main explosive with positive oxygen balance, a guest regulator and isolation microcapsules; the main explosive with the positive oxygen balance includes raw materials in parts by mass: monomethylamine nitrate, ammonium nitrate, sodium nitrate, water, guar gum, sodium nitrite, a high-temperature resistant regulator with a low detonation velocity and a surfactant; the guest regulator includes raw materials in parts by mass: a reducing agent and a density regulator; the isolation microcapsules include raw materials in parts by mass: porous hollow microbeads, a pore plugging agent and wall materials of pressure-resistant microcapsules; the guest regulator exists in the porous hollow microbeads of the isolation microcapsules.

公开(公告)号：US20220282598A1

公开(公告)日：2022-09-08

申请号：US17685932

申请日：2022-03-03

Applicant: China University of Mining and Technology

Inventor： Ning Luo ,  Cheng Zhai ,  Hanliang Liang ,  Yunchen Suo ,  Xiaolong Cao ,  Yishuo Yuan ,  Yabo Chai

IPC: E21B43/117

Abstract: An in-situ methane explosion shaped charge perforating device with a molecular sieve is provided and includes a body, an end of the body is fixedly connected to the molecular sieve, two sides of the molecular sieve are fixedly connected to two baffles respectively, each baffle is embedded with several first check valves inside, an end of the body far away from the molecular sieve is fixedly connected to a fixing plate, a center of the fixing plate is embedded with an ignition device, a bottom of the fixing plate is embedded with a concentration sensor, a portion of the fixing plate between the ignition device and the concentration sensor is formed with an air extracting hole, inner walls of a top and a bottom of the body are symmetrically embedded with second check valves, and the ignition device and the concentration sensor are electrically connected to an external controller.