Abstract: A simulation test system 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 simulates a tectonically-deformed coal reservoir. A horizontal well drilling and reaming simulation subsystem constructs a U-shaped well in which a horizontal well adjoins a vertical well, and performs a reaming process on a horizontal section thereof. A horizontal well hole-collapse cavity-construction depressurization excitation simulation subsystem 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 further pulverizes the coal and lifts the mixture. A gas-liquid-solid separation simulation subsystem separates the coal, liquid and gas.
Type:
Grant
Filed:
November 12, 2018
Date of Patent:
June 15, 2021
Assignees:
China University of Mining and Technology, XUZHOU OLIVINE GEOSCIENCE & GEOTEC CO., LTD., CHINA UNIVERSITY OF PETROLEUM, EAST CHINA, ANHUI UNIVERSITY OF SCIENCE AND TECHNOLOGY, WUHAN INSTITUTE OF TECHNOLOGY