Flow of a two-phase, gas-liquid fluid in a model wellbore has been studied. Observations using an air-water system are related to in-wellbore phase separation of two-phase steam typical of that being injected into multiple perforations or zones. The air-water system has a phase density difference similar to steam vapor and liquid. Results show that when such a two-phase fluid exits the injection tubing in the model wellbore, separation of the phases occurs. This may translate into nonuniform steam quality distribution at various points in an interval undergoing steam injection. Phase separation in the wellbore is of concern because it may affect steam drive or stimulation efficiency. Parameters that affect in-wellbore vapor-liquid distribution include completion geometry, total injection flow rate, and downhole quality.

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