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Study on Annular Pressure Buildup in Offshore Heavy Oil Thermal Recovery Wells Considering Dissolved Gas Contained in Annuli

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  • Hao Wang

    (College of Petroleum Engineering, China University of Petroleum-Beijing, Beijing 102249, China
    MOE Key Laboratory of Petroleum Engineering, China University of Petroleum-Beijing, Beijing 102249, China)

  • Hui Zhang

    (College of Petroleum Engineering, China University of Petroleum-Beijing, Beijing 102249, China)

  • Jun Li

    (College of Petroleum Engineering, China University of Petroleum-Beijing, Beijing 102249, China)

  • Anming Chen

    (Sinopec Huadong Oilfield Service Corporation, Nanjing 210000, China)

  • Jun Liu

    (Sinopec Huadong Oilfield Service Corporation, Nanjing 210000, China)

  • Tengfei Sun

    (College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China)

  • Cong Lin

    (AVIC China Aero-Polytechnology Establishment, Beijing 100028, China)

Abstract

In the offshore industry, especially heavy oil thermal recovery wells, due to the great temperature difference between the low-temperature seawater and high-temperature heavy oil, it is easy to cause the temperature increase of annular fluid in the operation process which will result in the annular pressure buildup phenomenon (APB). The increase of annulus pressure may lead to the failure of the casing and wellbore integrity, which will seriously affect the normal production and lead to great economic loss. In order to study the formation of APB and provide a basis for the field operation design, a radial full-size physical experiment of APB was carried out in this work and an annular pressure prediction model in the presence of dissolved gas was proposed based on the experimental results. The verification and comparison analyses of the full-liquid model and the dissolved gas model were conducted with the experimental data. Furthermore, the sensitivity analysis of the influence of the dissolved gas volume fraction and casing deformation on APB was carried out. The results show that the prediction results calculated by the dissolved gas model are in good agreement with the experimental data and the prediction accuracy is higher than that of the full-liquid model. When the annular dissolved gas volume fraction is less than 0.1%, the full-liquid model can be used to simplify and approximate calculations. Ignoring casing deformation will produce prediction error in each annulus, which means this simplification should be used with extreme caution. This work provides a valuable experimental reference for the study of APB, as well as a novel model for APB prediction in the field.

Suggested Citation

  • Hao Wang & Hui Zhang & Jun Li & Anming Chen & Jun Liu & Tengfei Sun & Cong Lin, 2021. "Study on Annular Pressure Buildup in Offshore Heavy Oil Thermal Recovery Wells Considering Dissolved Gas Contained in Annuli," Energies, MDPI, vol. 14(11), pages 1-20, May.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:11:p:3213-:d:566041
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    References listed on IDEAS

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    1. Chengcheng Tao & Eilis Rosenbaum & Barbara G. Kutchko & Mehrdad Massoudi, 2021. "A Brief Review of Gas Migration in Oilwell Cement Slurries," Energies, MDPI, vol. 14(9), pages 1-22, April.
    2. Yasaman Foolad & Majid Bizhani & Ian A. Frigaard, 2021. "A Comparative Study of Laminar-Turbulent Displacement in an Eccentric Annulus under Imposed Flow Rate and Imposed Pressure Drop Conditions," Energies, MDPI, vol. 14(6), pages 1-18, March.
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    5. Hanieh K. Foroushan & Bjørnar Lund & Jan David Ytrehus & Arild Saasen, 2021. "Cement Placement: An Overview of Fluid Displacement Techniques and Modelling," Energies, MDPI, vol. 14(3), pages 1-33, January.
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    Cited by:

    1. Reza Rezaee, 2022. "Editorial on Special Issues of Development of Unconventional Reservoirs," Energies, MDPI, vol. 15(7), pages 1-9, April.

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