Research on Transient Flow Law of Multiphase Flow After Down-hole Blowout Preventer Setting

doi:10.11885/j.issn.1674-5086.2020.05.20.03

Abstract

Abstract: When drilling encounters high-pressure and high-production gas layers, there are many complicated situations such as lost circulation, gas invasion and overflow. At present, the research of wellhead BOP has become more mature, but research on the transient flow law of multiphase flow about the down-hole BOP is inadequate. For this reason, in view of the complex flow characteristics of the lower wellbore after setting of the down-hole BOP, a mathematical model and numerical solution of the formation-wellbore coupled transient flow after setting of the down-hole BOP are established. The pressure distribution and influencing factors are analyzed. The simulation results of the example show that, after setting of the down-hole BOP, the wellbore pressure evolution at different depths is basically the same; under different formation permeability, the bottom hole pressure increases exponentially and then increases linearly; as the amount of gas intrusion continues to increase, the initial down hole pressures will eventually stabilize around the formation pressure.

Key words: down-hole blowout preventer, multiphase flow, transient flow model, flow law, pressure distribution

CLC Number:

TE28

GU Lei, HU Yifan, MA Lanrong, YIN Huibo, LI Gao. Research on Transient Flow Law of Multiphase Flow After Down-hole Blowout Preventer Setting[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(1): 158-164.

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