Abstract
The paper presents a model of nonstationary liquid-gas flow in a well considering non-equilibrium phase transitions. The problem is topical for Managed Pressure Drilling (MPD) with lightweight oil-based mud in case of a gas kick. The model accounts for the relaxation character of gas dissolution and separation at phase transitions in the liquid-gas system. A numerical solution method has been proposed, which is based on the kinematic-wave model. The paper provides examples of gassy and bubbly area evolution and hydrodynamic flow parameters during a gas kick. The effect of backpressure on the velocity of gas kick and bottomhole pressure has been analyzed. It has been demonstrated that consideration of phase transitions considerably affects the gas kick process and the bubbly-gassy area rising to the wellhead.
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