Research on Wellbore Pressure in the Dynamic Killing Process for Complex Structure Wells Based on the Wellbore Multiphase Flow Theory

YANG Pengfei; MAO Liangjie; YANG Sen; CHEN Xuefeng

doi:10.21656/1000-0887.450061

Volume 46 Issue 2

Feb. 2025

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Article Navigation > Applied Mathematics and Mechanics > 2025 > 46(2): 254-270

YANG Pengfei, MAO Liangjie, YANG Sen, CHEN Xuefeng. Research on Wellbore Pressure in the Dynamic Killing Process for Complex Structure Wells Based on the Wellbore Multiphase Flow Theory[J]. Applied Mathematics and Mechanics, 2025, 46(2): 254-270. doi: 10.21656/1000-0887.450061

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Research on Wellbore Pressure in the Dynamic Killing Process for Complex Structure Wells Based on the Wellbore Multiphase Flow Theory

doi: 10.21656/1000-0887.450061

1.
School of Oil & Natural Gas Engineering, Southwest Petroleum University, Chengdu 610500, P.R.China
2.
Development Department, Petro China Southwest Oil & Gasfield Company, Chengdu 610000, P.R.China
3.
CNPC Engineering Technology Research Company Limited, Beijing 102200, P.R.China

Received Date: 2024-03-06
Rev Recd Date: 2024-07-15
Publish Date: 2025-02-01

Abstract

Abstract

Based on the wellbore multiphase flow theory and the calculation method for wellbore trajectories, a dynamic well killing mathematical model for complex well structures was established, and the finite difference method was used to solve it. The wellbore pressures during the well killing process were simulated and studied, and the influences of initial gas influxes, kill fluid displacements and densities, and horizontal well lengths on the wellbore pressures were studied. The research results show that, for high inclination and horizontal wells, the casing pressures will become larger and the casing time will increase significantly in the process of killing well. The larger the initial gas inflow is, the higher the casing pressures and riser pressures will be, to balance the wellbore pressures. The higher the killing capacity is, the lower the casing pressure and the higher the riser pressure will be. The higher the kill fluid density is, the lower the casing pressures and riser pressures will be. The longer the horizontal section length is, the greater the casing pressures and the longer the kill time will be. The work has guiding significance to ensure the well killing operation of complex structure wells.
- complex structure well,
- dynamic killing well,
- well trajectory,
- wellbore pressure

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References

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