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Research and Application of Surface Throttling Technology for Ultra-High-Pressure Sour Natural Gas Wells in Northwestern Sichuan Basin

Author

Listed:
  • Zhaoqian Luo

    (Northwest Sichuan Gas District of Southwest Oil and Gasfield Company, Jiangyou 621741, China)

  • Qilin Liu

    (Northwest Sichuan Gas District of Southwest Oil and Gasfield Company, Jiangyou 621741, China)

  • Fan Yang

    (Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China)

  • Ziyuan Li

    (Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China)

  • Huanhuan Wang

    (Northwest Sichuan Gas District of Southwest Oil and Gasfield Company, Jiangyou 621741, China)

  • Bo Wang

    (Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China)

  • Zhouyu Peng

    (Northwest Sichuan Gas District of Southwest Oil and Gasfield Company, Jiangyou 621741, China)

  • Wenlong Jia

    (Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China)

Abstract

The gas reservoirs in the Northwestern Sichuan Basin have great development potential. However, their production efficiency is seriously reduced by the complex surface multistage throttling process and frequent hydrate plugging caused by the ultra-high-pressure sour gas. Considering the prevention and control of hydrates, properly designing the throttling temperature and pressure to optimize the surface production process is the key to solving this problem. First, this work presents a method for predicting the hydrate formation conditions of ultra-high-pressure sour natural gas based on the vdW-P (van der Waals–Platteeuw) model and the CPA (cubic-plus-association) equation of state (EoS) and considering the association between acid gases (H 2 S, CO 2 ) and H 2 O. Secondly, the throttling temperature prediction method was developed by coupling the isenthalpic throttling model and the modified Lee–Kesler EoS mixing rule; the maximum throttling pressure difference calculation method was constructed based on the critical flow principle. Finally, field cases are given to illustrate the distribution process of assigning the maximum throttling pressure differences. The results show that the proposed model can accurately predict the hydrate formation conditions and throttling temperature of ultra-high-pressure sour natural gas, and reveal their changing laws. The surface throttling technology of the ultra-high-pressure sour gas wells Long 004-X1 and Long 016-H1 was optimized from five-stage to three-stage, and the application of the fixed throttle valve in the field is successfully demonstrated.

Suggested Citation

  • Zhaoqian Luo & Qilin Liu & Fan Yang & Ziyuan Li & Huanhuan Wang & Bo Wang & Zhouyu Peng & Wenlong Jia, 2022. "Research and Application of Surface Throttling Technology for Ultra-High-Pressure Sour Natural Gas Wells in Northwestern Sichuan Basin," Energies, MDPI, vol. 15(22), pages 1-14, November.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:22:p:8641-:d:976168
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    References listed on IDEAS

    as
    1. Changjun Li & Wenlong Jia & Xia Wu, 2012. "Temperature Prediction for High Pressure High Temperature Condensate Gas Flow Through Chokes," Energies, MDPI, vol. 5(3), pages 1-13, March.
    2. Jia, Wenlong & Yang, Fan & Li, Changjun & Huang, Ting & Song, Shuoshuo, 2021. "A unified thermodynamic framework to compute the hydrate formation conditions of acidic gas/water/alcohol/electrolyte mixtures up to 186.2 MPa," Energy, Elsevier, vol. 230(C).
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