Study on Quantitative Assessment of CO 2 Leakage Risk Along the Wellbore Under the Geological Storage of the Salt Water Layer

Shaobo Gao, Shanpo Jia (), Yanwei Zhu, Long Zhao, Yuxuan Cao, Xianyin Qi and Fatian Guan
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Shaobo Gao: School of Civil Engineering and Architecture, Northeast Petroleum University, Daqing 163318, China
Shanpo Jia: Bohai Rim Energy Research Institute, Northeast Petroleum University, Qinhuangdao 066004, China
Yanwei Zhu: Zhongyuan Gas Storage Co., Ltd., PipeChina, Puyang 457000, China
Long Zhao: School of Environmental & Safety Engineering, Liaoning Petrochemical University, Fushun 113001, China
Yuxuan Cao: Zhongyuan Gas Storage Co., Ltd., PipeChina, Puyang 457000, China
Xianyin Qi: Bohai Rim Energy Research Institute, Northeast Petroleum University, Qinhuangdao 066004, China
Fatian Guan: School of Civil Engineering and Architecture, Northeast Petroleum University, Daqing 163318, China

Energies, 2024, vol. 17, issue 21, 1-20

Abstract: In the process of CO 2 geological storage in the salt water layer, CO 2 leakage along the wellbore will seriously affect the effective storage of CO 2 in the target geological area. To solve this problem, based on the investigation of a large number of failure cases of CO 2 storage along the wellbore and failure cases of gas storage wells in the injection stage of the wellbore, the influencing factors of CO 2 leakage risk along the wellbore were investigated in detail. Based on the analytic hierarchy process (AHP) and extension theory, 17 basic evaluation indexes were selected from 6 perspectives to establish the evaluation index system of CO 2 leakage risk along the wellbore. The established evaluation system was used to evaluate the leakage risk of a CO 2 storage well in the X gas field of BZ Block. The results showed that the influencing factors of tubing had the smallest weight, followed by cement sheath, and the influencing factors of casing–cement sheath interface and cement sheath–formation interface had the largest weight, accounting for 23.73% and 34.32%, respectively. The CO 2 storage well leakage risk evaluation grade was Ι, with minimal leakage risk. The CO 2 storage effect was excellent. The evaluation system comprehensively considers the tubing string, cement sheath, and micro-annulus interface, which can provide a scientific basis for the risk assessment of CO 2 leakage along the wellbore under the CO 2 geological storage of the salt water layer.

Keywords: salt water layer; CO 2 geological storage; wellbore leakage risk; analytic hierarchy process; evaluation system (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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