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Research on the Law of Surge Pressure during Tripping of HTHP Wells under the Influence of Tool Joints

Author

Listed:
  • Jiangang Shi

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
    Research Institute of Engineering Technology, PetroChina Xinjiang Oilfield Company, Karamay 834000, China)

  • Buwen Yu

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China)

  • Xianzhi Song

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China)

  • Yong Guo

    (Research Institute of Engineering Technology, PetroChina Xinjiang Oilfield Company, Karamay 834000, China)

Abstract

Accurate surge pressure prediction during tripping is significant to ensure drilling safety. Based on the theory of wellbore hydraulics and heat transfer, a surge pressure prediction model considering the influence of HTHP and joints is established in this paper. The finite difference method is used to solve the wellbore flow model. Compared with the measured surge pressure, it was found that the error between the predicted and measured values after considering the above factors was only 0.89%. The influence of dimensionless joint outer diameter, joint length and drill string tripping speed on the surge pressure was further analyzed. The results show that the existence of joints increases the surge pressure. When the dimensionless joint outer diameter was increased from 0.70 to 0.91, the surge pressure increased by 76%. Neglecting the effect of the joint will cause a large error in calculating the surge pressure. In addition, the surge pressure is positively correlated with the drill string tripping speed. However, with the decrease in drill string tripping speed, the surge pressure will gradually tend to a stable value. This study provides a theoretical reference for the hydraulic design of HTHP well tripping.

Suggested Citation

  • Jiangang Shi & Buwen Yu & Xianzhi Song & Yong Guo, 2022. "Research on the Law of Surge Pressure during Tripping of HTHP Wells under the Influence of Tool Joints," Energies, MDPI, vol. 15(23), pages 1-19, November.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:23:p:8943-:d:984814
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