Title:
SIMULATION TEST METHOD FOR GAS EXTRACTION FROM TECTONICALLY-DEFORMED COAL SEAM IN-SITU BY DEPRESSURIZING HORIZONTAL WELL CAVITY
Document Type and Number:
WIPO Patent Application WO/2019/205577
Kind Code:
A8
Abstract:
A simulation test method for gas extraction from a tectonically-deformed coal seam in-situ by depressurizing a horizontal well cavity. A coal series stratum structure reconstruction and similar material simulation subsystem (1) simulates the construction of a coal reservoir. A horizontal well drilling and reaming simulation subsystem (2) constructs a U-shaped well in which a horizontal well (1.11) adjoins a vertical well (1.12), and performs a reaming process on a horizontal section thereof. A horizontal well hole-collapse cavity-construction depressurization excitation simulation subsystem (3) performs pressure-pulse excitation and stress release on the horizontal well, and hydraulically displaces a coal-liquid-gas mixture such that the mixture is conveyed towards a vertical well section. A product lifting simulation subsystem (4) further pulverizes the coal and lifts the mixture. A gas-liquid-solid separation simulation subsystem (5) separates the coal, liquid and gas. A monitoring and control subsystem detects and controls the operation and the execution processes of equipment in real time. The method enables the simulation of completion of a large-diameter horizontal well in a loose tectonically-deformed coal reservoir, horizontal well cavity-construction stress release, effective lifting of mixed fluids, and efficient separation of produced mixtures, thereby providing guidance for efficient in-situ extraction of tectonically-deformed coal seam gas.
Inventors:
SANG SHUXUN (CN)
ZHOU XIAOZHI (CN)
CAO LIWENG (CN)
LIU SHIQI (CN)
WANG HAIWEN (CN)
LIU HUIHU (CN)
LI ZICHENG (CN)
JIA JINLONG (CN)
HUANG HUAZHOU (CN)
LIU CHANGJIANG (CN)
XU HONGJIE (CN)
WANG RAN (CN)
ZHU SHUYUN (CN)
ZHOU XIAOZHI (CN)
CAO LIWENG (CN)
LIU SHIQI (CN)
WANG HAIWEN (CN)
LIU HUIHU (CN)
LI ZICHENG (CN)
JIA JINLONG (CN)
HUANG HUAZHOU (CN)
LIU CHANGJIANG (CN)
XU HONGJIE (CN)
WANG RAN (CN)
ZHU SHUYUN (CN)
Application Number:
PCT/CN2018/114946
Publication Date:
November 28, 2019
Filing Date:
November 12, 2018
Export Citation:
Assignee:
UNIV CHINA MINING (CN)
XUZHOU OLIVINE GEOSCIENCE & GEOTECH CO LTD (CN)
UNIV CHINA PETROLEUM EAST CHINA (CN)
UNIV ANHUI SCI & TECHNOLOGY (CN)
WUHAN INST TECHNOLOGY (CN)
XUZHOU OLIVINE GEOSCIENCE & GEOTECH CO LTD (CN)
UNIV CHINA PETROLEUM EAST CHINA (CN)
UNIV ANHUI SCI & TECHNOLOGY (CN)
WUHAN INST TECHNOLOGY (CN)
International Classes:
E21B43/00; E21F7/00
Attorney, Agent or Firm:
NANJING JINGWEI PATENT & TRADEMARK AGENCY CO., LTD (CN)
Download PDF: