Volume 43 Issue 4
Apr.  2022
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MAO Liangjie, ZHANG Xiaocheng, XUE Jibiao, ZHAN Ning, LIU Jun. Research on Calculation of Riser Gas Injection Dual-Gradient Drilling Wellbore Parameters[J]. Applied Mathematics and Mechanics, 2022, 43(4): 401-415. doi: 10.21656/1000-0887.420065
Citation: MAO Liangjie, ZHANG Xiaocheng, XUE Jibiao, ZHAN Ning, LIU Jun. Research on Calculation of Riser Gas Injection Dual-Gradient Drilling Wellbore Parameters[J]. Applied Mathematics and Mechanics, 2022, 43(4): 401-415. doi: 10.21656/1000-0887.420065

Research on Calculation of Riser Gas Injection Dual-Gradient Drilling Wellbore Parameters

doi: 10.21656/1000-0887.420065
  • Received Date: 2021-03-09
  • Rev Recd Date: 2021-10-06
  • Available Online: 2022-03-10
  • Publish Date: 2022-04-01
  • Based on the characteristics of multiphase flow in riser annulus during dual-gradient drilling with riser gas injection, a multi-phase flow model for the riser gas injection dual-gradient drilling wellbore was established. The model was solved with the finite difference method and combined with the actual parameters of a deep water well in the Gulf of Mexico. The influences of drilling parameters on the bottom hole pressure and the annulus pressure, and the influence factors on the gas injection flow rate were discussed. The research results show that, the bottom hole pressure of dual-gradient riser gas injection drilling is lower than that of conventional drilling, and is more suitable for subsea narrow-density window drilling; the magnitude of the gas injection flow rate during the dual-gradient riser gas injection drilling process has great effects on the bottom hole pressure and the annulus pressure, and the water depth as well as the drilling fluid density are 2 important factors influencing the gas injection flow. In the design of the dual-gradient drilling parameters for riser gas injection, the appropriate gas injection flow rate should be selected and the drilling fluid density should not be too large to ensure the safety of dual-gradient riser gas injection drilling. The research has guiding significance for the design of dual-gradient drilling with riser gas injection and field operations.

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