Research progress and development direction of key technologies for efficient coalbed methane development in China

Authors

XU Fengyin, China United Coalbed Methane National Engineering Research Center Co., Ltd., Beijing 100095, China; PetroChina Coalbed Methane Company Limited, Beijing 100028, China;Follow
YAN Xia, China United Coalbed Methane National Engineering Research Center Co., Ltd., Beijing 100095, China; PetroChina Coalbed Methane Company Limited, Beijing 100028, China;Follow
LIN Zhenpan, PetroChina Coalbed Methane Company Limited, Beijing 100028, China
LI Shuguang, China United Coalbed Methane National Engineering Research Center Co., Ltd., Beijing 100095, China; PetroChina Coalbed Methane Company Limited, Beijing 100028, China;
XIONG Xianyue, PetroChina Coalbed Methane Company Limited, Beijing 100028, China
YAN Detian, College of Resources, China University of Geosciences(Wuhan), Wuhan 430074, China
WANG Hongya, China United Coalbed Methane National Engineering Research Center Co., Ltd., Beijing 100095, China; PetroChina Coalbed Methane Company Limited, Beijing 100028, China;
ZHANG Shuangyuan, China United Coalbed Methane National Engineering Research Center Co., Ltd., Beijing 100095, China; PetroChina Coalbed Methane Company Limited, Beijing 100028, China;
XU Borui, China United Coalbed Methane National Engineering Research Center Co., Ltd., Beijing 100095, China; PetroChina Coalbed Methane Company Limited, Beijing 100028, China;
MA Xinyuan, China United Coalbed Methane National Engineering Research Center Co., Ltd., Beijing 100095, China; PetroChina Coalbed Methane Company Limited, Beijing 100028, China;
BAI Nan, PetroChina Coalbed Methane Company Limited, Beijing 100028, China
MEI Yonggui, PetroChina Coalbed Methane Company Limited, Beijing 100028, China

Abstract

During the 13th Five Year Plan period, the major problem of the low output of a single well of coalbed methane (CBM) has restricted the efficient development of CBM in China. Through Major National Science and Technology Projects and other technical researches, significant progress has been made in the theoretical understanding and engineering technology of CBM exploration and development. It is manifested in four aspects as follows. Firstly, the exploration concept has changed from looking for rich dessert areas to high-yield dessert areas, and the extensive development deployment has become finer. Secondly, in terms of efficient stimulation technology, with the expansion from two-dimensional seimic to three-dimensional seimic and from vertical wells (cluster wells) to horizontal wells, a new series of fracturing stimulation technologies for coal reservoirs transformation are developed, including indirect fracturing of crushed soft coal, multi-cluster acid fracturing of few sections of horizontal wells applied to calcite filled deep coal seams, and ultra-large-scale limit fracturing of horizontal wells in ultra-low permeability deep coal seams. These technologies have preliminarily solved the problem of economic benefit development of structural coal CBM, broken through the bottleneck of fracturing technology in coal seams with a depth of more than 2 000 m, and promoted the extension of CBM development from medium-shallow layers to deep layers. Thirdly, in terms of drainage and production technology, key technologies such as quantitative drainage and production multi-objective optimization design, CBM well rodless lifting and negative pressure drainage technology have been developed, promoting the transformation of CBM drainage and production control from qualitative to semi-quantitative and quantitative, solving the drainage and production problems of integrated cluster well groups and downward inclined horizontal wells, and effectively improving the production of single wells and the recovery rate of CBM. At last, in terms of stable production and stimulation technology, the innovative technologies are proposed, including stress release gas production of large-diameter horizontal wells and controllable temperature nitrogen injection displacement and stimulation of CBM, which provides technical reserves for the secondary development of CBM. In view of the stage characteristics of China’s CBM industry in the “climbing period” and “strategic opportunity period”, and the goal of the “carbon peak and neutrality”, based on the technical problems that need to be solved, this paper puts forward the “two-step” development strategy of China’s CBM industry. (1) By 2025, breakthroughs will be made in theory and technology, reaching the national target of 10 billion cubic meters per year in the 14th Five Year Plan, and strengthening confidence in industrial development. (2) By 2030, applicable technologies for different geological conditions in China will be formed, reaching the target of annual output of 30 billion cubic meters, and becoming an important part of natural gas production. The corresponding countermeasures are as follows. From the perspective of technology and management, according to the five elements of resources, technology, talents, policy and investment, and in line with the principle of “technological breakthrough as the core, five in one and collaborative innovation”, supporting safeguard measures are studied, formulated and implemented. Moreover, from the two aspects of efficient development and increasing the output of single well, theoretical research and technical research directions in nine aspects related to the future development of CBM industry are put forward, so as to achieve the goal of realizing the high-quality development of national CBM industry.

Funding Information

10.12363/issn.1001-1986.21.12.0736

Keywords

coalbed methane, exploration, efficient stimulation, drainage and production, technical progress, development direction

Recommended Citation

XU Fengyin, YAN Xia, LIN Zhenpan, et al. (2022) "Research progress and development direction of key technologies for efficient coalbed methane development in China," Coal Geology & Exploration: Vol. 50: Iss. 3, Article 2.
Available at: https://cge.researchcommons.org/journal/vol50/iss3/2

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