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A Comprehensive Evaluation Method for Cement Slurry Systems to Enhance Zonal Isolation: A Case Study in Shale Oil Well Cementing

Author

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  • Xiaoqing Zheng

    (CNPC Daqing Drilling Engineering Company Limited, Daqing 163511, China)

  • Weitao Song

    (Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China
    National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China)

  • Xiutian Yang

    (CNPC Daqing Drilling Engineering Company Limited, Daqing 163511, China)

  • Jian Liu

    (Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China
    National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China)

  • Tao Jiang

    (CNPC Daqing Drilling Engineering Company Limited, Daqing 163511, China)

  • Xuning Wu

    (Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China
    National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China)

  • Xin Liu

    (CNPC Daqing Drilling Engineering Company Limited, Daqing 163511, China)

Abstract

Due to post-cementing hydraulic fracturing and other operational stresses, inadequate mechanical properties or suboptimal design of the cement sheath can lead to tensile failure and microcrack development, compromising both hydrocarbon recovery and well integrity. In this study, three field-deployed cement slurry systems were compared on the basis of their basic mechanical properties such as compressive and tensile strength. Laboratory-scale physical simulations of hydraulic fracturing during shale oil production were conducted, using dynamic permeability as a quantitative indicator of integrity loss. The experimental results show that evaluating only basic mechanical properties is insufficient for cement slurry system design. A more comprehensive mechanical assessment is re-quired. Incorporation of an expansive agent into the cement slurry system can alleviate the damage caused by the microannulus to the interfacial sealing performance of the cement sheath, while adding a toughening agent can alleviate the damage caused by tensile cracks to the sealing performance of the cement sheath matrix. Through this research, a microexpansive and toughened cement slurry system, modified with both expansive and toughening agents, was optimized. The expansive agent and toughening agent can significantly enhance the shear strength, the flexural strength, and the interfacial hydraulic isolation strength of cement stone. Moreover, the expansion agents mitigate the detrimental effects of microannulus generation on the interfacial sealing, while the toughening agents alleviate the damage caused by tensile cracking to the bulk sealing performance of the cement sheath matrix. This system has been successfully implemented in over 100 wells in the GL block of Daqing Oilfield. Field application results show that the proportion of high-quality well sections in the horizontal section reached 88.63%, indicating the system’s high performance in enhancing zonal isolation and cementing quality.

Suggested Citation

  • Xiaoqing Zheng & Weitao Song & Xiutian Yang & Jian Liu & Tao Jiang & Xuning Wu & Xin Liu, 2025. "A Comprehensive Evaluation Method for Cement Slurry Systems to Enhance Zonal Isolation: A Case Study in Shale Oil Well Cementing," Energies, MDPI, vol. 18(15), pages 1-19, August.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:15:p:4138-:d:1717459
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    References listed on IDEAS

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    1. Han, Xu & Feng, Fuping & Zhang, Jianwei, 2023. "Study on the whole life cycle integrity of cement interface in heavy oil thermal recovery well under circulating high temperature condition," Energy, Elsevier, vol. 278(PB).
    2. Bożena Gajdzik & Radosław Wolniak & Rafał Nagaj & Wieslaw Wes Grebski & Taras Romanyshyn, 2023. "Barriers to Renewable Energy Source (RES) Installations as Determinants of Energy Consumption in EU Countries," Energies, MDPI, vol. 16(21), pages 1-32, October.
    3. Santanu Kumar Dash & Suprava Chakraborty & Devaraj Elangovan, 2023. "A Brief Review of Hydrogen Production Methods and Their Challenges," Energies, MDPI, vol. 16(3), pages 1-17, January.
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