Plugging is a prominent reason for production reduction in coalbed methane (CBM) wells. In order to solve this problem, authors conducted the feasibility analysis and optimal design of acidizing of CBM wells to remove the plugging in Hancheng block (H block) China. First, X-ray diffraction analysis shows that the plugging contains acid-soluble minerals and the field case indicates that acidizing effect is positively correlated with the content of acid-soluble minerals. Inspired by this, authors analyze determining factors of the content of acid-soluble minerals. Well logging parameters (DEN, AC, GR) are selected to establish a neural network model to predict the content of acid-soluble minerals. Furthermore, a feasibility criterion of acidizing of CBM wells is proposed. Then, a forward model and an inversion algorithm are proposed to diagnose the plugging. The multisolution problem of parameters inversion is solved by the Gauss–Marquardt (G-M) algorithm based on the stochastic initial value and maximum probability. Combining this method with the current numerical model of acidizing, authors present an optimal design in order to optimize the volume and injection rate of the acid. Meanwhile, by experimental study, authors propose a new acid formulation. Finally, results have been applied in the field to confirm the feasibility of the acidizing. It turns out that acidizing is an effective stimulation technology for some specific CBM wells, and the feasibility analysis and the optimal design can improve the effect of acidizing of CBM wells.
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August 2019
Research-Article
Feasibility Analysis and Optimal Design of Acidizing of Coalbed Methane Wells
Zixi Guo,
Zixi Guo
State Key Laboratory of Oil and Gas Reservoir
Geology and Exploitation,
Southwest Petroleum University,
Chengdu, Sichuan 610500, China;
Petroleum Systems Engineering,
Faculty of Engineering and Applied Science,
University of Regina,
Regina, SK S4S 0A2, Canada
Geology and Exploitation,
Southwest Petroleum University,
Chengdu, Sichuan 610500, China;
Petroleum Systems Engineering,
Faculty of Engineering and Applied Science,
University of Regina,
Regina, SK S4S 0A2, Canada
Search for other works by this author on:
Yiyu Chen,
Yiyu Chen
PetroChina Coalbed Methane Company Limited,
Chaoyang, Beijing 100028, China
Chaoyang, Beijing 100028, China
Search for other works by this author on:
Shanshan Yao,
Shanshan Yao
Petroleum Systems Engineering,
Faculty of Engineering and Applied Science,
University of Regina,
Regina, SK S4S 0A2, Canada
Faculty of Engineering and Applied Science,
University of Regina,
Regina, SK S4S 0A2, Canada
Search for other works by this author on:
Qiushi Zhang,
Qiushi Zhang
Petroleum Systems Engineering,
Faculty of Engineering and Applied Science,
University of Regina,
Regina, SK S4S 0A2, Canada
Faculty of Engineering and Applied Science,
University of Regina,
Regina, SK S4S 0A2, Canada
Search for other works by this author on:
Yongbing Liu,
Yongbing Liu
State Key Laboratory of Oil and Gas Reservoir
Geology and Exploitation,
Southwest Petroleum University,
Chengdu, Sichuan 610500, China
Geology and Exploitation,
Southwest Petroleum University,
Chengdu, Sichuan 610500, China
Search for other works by this author on:
Fanhua Zeng
Fanhua Zeng
Petroleum Systems Engineering,
Faculty of Engineering and Applied Science,
University of Regina,
Regina, SK S4S 0A2, Canada
Faculty of Engineering and Applied Science,
University of Regina,
Regina, SK S4S 0A2, Canada
Search for other works by this author on:
Zixi Guo
State Key Laboratory of Oil and Gas Reservoir
Geology and Exploitation,
Southwest Petroleum University,
Chengdu, Sichuan 610500, China;
Petroleum Systems Engineering,
Faculty of Engineering and Applied Science,
University of Regina,
Regina, SK S4S 0A2, Canada
Geology and Exploitation,
Southwest Petroleum University,
Chengdu, Sichuan 610500, China;
Petroleum Systems Engineering,
Faculty of Engineering and Applied Science,
University of Regina,
Regina, SK S4S 0A2, Canada
Yiyu Chen
PetroChina Coalbed Methane Company Limited,
Chaoyang, Beijing 100028, China
Chaoyang, Beijing 100028, China
Shanshan Yao
Petroleum Systems Engineering,
Faculty of Engineering and Applied Science,
University of Regina,
Regina, SK S4S 0A2, Canada
Faculty of Engineering and Applied Science,
University of Regina,
Regina, SK S4S 0A2, Canada
Qiushi Zhang
Petroleum Systems Engineering,
Faculty of Engineering and Applied Science,
University of Regina,
Regina, SK S4S 0A2, Canada
Faculty of Engineering and Applied Science,
University of Regina,
Regina, SK S4S 0A2, Canada
Yongbing Liu
State Key Laboratory of Oil and Gas Reservoir
Geology and Exploitation,
Southwest Petroleum University,
Chengdu, Sichuan 610500, China
Geology and Exploitation,
Southwest Petroleum University,
Chengdu, Sichuan 610500, China
Fanhua Zeng
Petroleum Systems Engineering,
Faculty of Engineering and Applied Science,
University of Regina,
Regina, SK S4S 0A2, Canada
Faculty of Engineering and Applied Science,
University of Regina,
Regina, SK S4S 0A2, Canada
1Corresponding author.
Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received September 3, 2018; final manuscript received January 23, 2019; published online March 5, 2019. Editor: Hameed Metghalchi.
J. Energy Resour. Technol. Aug 2019, 141(8): 082906 (12 pages)
Published Online: March 5, 2019
Article history
Received:
September 3, 2018
Revised:
January 23, 2019
Citation
Guo, Z., Chen, Y., Yao, S., Zhang, Q., Liu, Y., and Zeng, F. (March 5, 2019). "Feasibility Analysis and Optimal Design of Acidizing of Coalbed Methane Wells." ASME. J. Energy Resour. Technol. August 2019; 141(8): 082906. https://doi.org/10.1115/1.4042735
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