Deep coalbed methane production technology for the eastern margin of the Ordos Basin: Advances and their implications

Authors

ZENG Wenting, PetroChina Coalbed Methane Company Limited, Beijing 100028, ChinaFollow
XU Fengyin, China United Coalbed Methane National Engineering Research Center Co., Ltd., Beijing 100095, China; Chinese Petroleum Society, Beijing 100724, ChinaFollow
ZHANG Lei, PetroChina Coalbed Methane Company Limited, Beijing 100028, China
SUN Weiwei, PetroChina Coalbed Methane Company Limited, Beijing 100028, China
WANG Qian, PetroChina Coalbed Methane Company Limited, Beijing 100028, China
LIU Yinhua, PetroChina Coalbed Methane Company Limited, Beijing 100028, China
YU Lizhu, PetroChina Coalbed Methane Company Limited, Beijing 100028, China
JI Liang, PetroChina Coalbed Methane Company Limited, Beijing 100028, China
ZENG Quanshu, China University of Petroleum (Beijing), Beijing 102299, China
ZHANG Kang, PetroChina Coalbed Methane Company Limited, Beijing 100028, China

Abstract

Contrasting with shallow to moderately deep coalbed methane (CBM) reservoirs, deep CBM reservoirs exhibit favorable coal structures, high formation pressure, high free gas ratios, and high contents of total dissolved solids (TDS) and CO₂. Extensive fracturing allows for CBM flowing at the initial stage, while the production parameters vary significantly throughout the CBM production. This requires wide technological boundaries of the main production technologies. Compared to shale gas and tight gas, deep CBM manifests different production mechanisms and relatively low free gas ratios, which lead to short flowing cycles of CBM. This necessitates timely water withdrawal for CBM production. Moreover, deep CBM wells remain in a low-production stage dominated by desorption for a long time. Based on the geological characteristics of deep coal reservoirs, this study investigated the Daning-Jixian block on the eastern margin of the Ordos Basin. It systematically analyzed the factors influencing deep CBM production, like stress sensitivity effect, velocity sensitivity, scaling blockage, Jamin effect, and free gas ratio, as well as their characteristics. Accordingly, this study pinpointed some technological challenges in deep CBM production: unknown conversion time limit between free and desorption gases, prominent corrosion and scaling caused by CO₂ and water with high TDS content, and short pump inspection cycles of horizontal wells. To minimize the bottomhole pressure, boost CBM desorption, and enhance the single-well estimated ultimate recovery (EUR), this study proposed the hydraulic jet pump lifting technology, which is the most suitable for horizontal well production currently and yields the optimal economic efficiency. Moreover, this study pointed out the research directions of production and hydraulic jet pump lifting technologies for deep CBM to transition into green and intelligent gas field development, including strengthening integrated geological-engineering research, establishing efficient CBM production systems, and exploring and testing integrated rodless lifting production technology.

Keywords

Ordos Basin, deep coalbed methane, production system, lifting technique, green and intelligent gas field

DOI

10.12363/issn.1001-1986.23.10.0698

Recommended Citation

ZENG Wenting, XU Fengyin, ZHANG Lei, et al. (2024) "Deep coalbed methane production technology for the eastern margin of the Ordos Basin: Advances and their implications," Coal Geology & Exploration: Vol. 52: Iss. 2, Article 4.
DOI: 10.12363/issn.1001-1986.23.10.0698
Available at: https://cge.researchcommons.org/journal/vol52/iss2/4

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