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Influences of Fracturing Fluid Injection on Mechanical Integrity of Cement Sheath under Four Failure Modes

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  • Honglin Xu

    (School of Petroleum and Natural Gas Engineering, Chongqing University of Science and Technology, Chongqing 401331, China)

  • Tianshou Ma

    (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
    State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences (CAS), Wuhan 430071, China)

  • Nian Peng

    (School of Petroleum and Natural Gas Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
    State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China)

  • Bin Yang

    (School of Petroleum and Natural Gas Engineering, Chongqing University of Science and Technology, Chongqing 401331, China)

Abstract

The significant decreased wellbore temperature and increased casing pressure during fracturing fluid injection present a big challenge for the mechanical integrity of cement sheath in fracturing wells. Based on the theories of elastic mechanics, thermodynamics, and a multi-layer composed thick-wall cylinder, this paper proposed a new mechanical model of cement sheath for fracturing wells, coupling pressure, and thermal loads, which consider the failure modes of de-bonding, radial cracking, disking, and shear failure. The radial nonuniform temperature change and the continuous radial stress and radial displacement at two interfaces have been considered. With the proposed model, the radial distributions of failure stress and the corresponding safety factor for cement sheath during fracturing fluid injection have been analyzed and compared under four failure modes. Results show that the decreased wellbore temperature will produce significant tri-axial tensile stress and induce cement failure of de-bonding, radial cracking, and disking. The increased casing pressure will significantly lower the risk of de-bonding but also aggravate radial cracking and shear failure. For integrity protection of cement sheath, increasing the injected fluid temperature, maintaining higher circulation pumping pressures, and adopting cement sheath with a low elasticity modulus have been suggested for fracturing wells.

Suggested Citation

  • Honglin Xu & Tianshou Ma & Nian Peng & Bin Yang, 2018. "Influences of Fracturing Fluid Injection on Mechanical Integrity of Cement Sheath under Four Failure Modes," Energies, MDPI, vol. 11(12), pages 1-18, December.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:12:p:3534-:d:191661
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    References listed on IDEAS

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    1. Honglin Xu & Nian Peng & Tianshou Ma & Bin Yang, 2018. "Investigation of Thermal Stress of Cement Sheath for Geothermal Wells during Fracturing," Energies, MDPI, vol. 11(10), pages 1-22, September.
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    Cited by:

    1. Lei Wang & Bohang Liu & Hanzhi Yang & Yintong Guo & Jing Li & Hejuan Liu, 2022. "Experimental Study on the Compressive and Shear Mechanical Properties of Cement–Formation Interface Considering Surface Roughness and Drilling Mud Contamination," Energies, MDPI, vol. 15(17), pages 1-17, September.
    2. Salaheldin Elkatatny, 2019. "Development of a Homogenous Cement Slurry Using Synthetic Modified Phyllosilicate while Cementing HPHT Wells," Sustainability, MDPI, vol. 11(7), pages 1-14, March.

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