Flashing two-phase flow can occur in fractured geothermal reservoirs when water flows toward the wellbore. The mass flow and enthalpy characteristics of wells with twophase flow feedzones have been investigated by using a modified critical flow slip model. The model includes the effect of heat transfer from the reservoir rock to the twophase flowing mixture. It was possible to estimate the effective fracture width of geothermal reservoir-well systems and to demonstrate under what conditions choking may occur in feedzone fractures.

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