Research on the Relationship between Pore Structure and the Compressive Strength of Oil-Well Cement

Guanyi Zheng (), Jinfei Sun, Xiaoyang Guo () and Zaoyuan Li
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Guanyi Zheng: College of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, China
Jinfei Sun: State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
Xiaoyang Guo: College of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, China
Zaoyuan Li: College of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, China

Energies, 2023, vol. 16, issue 15, 1-18

Abstract: The integrity of wellbore cement is an important guarantee for the long-term safety and effectiveness of carbon dioxide geological storage. During the process of CO 2 capture, utilization, and storage, construction factors will cause changes in temperature and pressure distribution, leading to changes in the pore structure of cement and a decline in compressive strength, which can easily cause the failure of cement ring integrity. To provide theoretical guidance and analysis methods for evaluating the mechanism of cement strength performance degradation and optimizing injection parameters, in this study, we conducted the following research based on relevant studies: (1) The fracture theory was revised based on the characteristic factors of oil-well cement; (2) a pore structure model was established to analyze the failure process of cement, clarifying the relationship between pore structure and the compressive strength of cement; (3) the parameters of the pore structure model were determined and analyzed, considering the influence of cement content and total porosity on the model, and finally, the regression parameter K value was determined to be 1600. This article can provide a useful reference for the research on the failure of cement rings in the CO 2 injection process and other related studies.

Keywords: cement ring integrity; compressive strength; pore structure; structure model (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: 2023
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