The steam and water relative permeabilities of a well at Momotombo geothermal reservoir have been attempted to calculate using available production test data. Flowing saturation value (S_wf) it yields by means the reservoir steam fraction obtained from flowing enthalpy production test and bottomhole temperature recorded; both values have been used to determine fluids properties, then S_wf will be used to determine the local water saturation value (S_w) by means of the relationship derived by Chen (2005) in fractured porous media, after that it will be used together with relative water saturation and immobile nucleated steam saturation values (S_wr, S_gn) determined by means trial and error in order to get relative permeabilities using steam relative permeability equation proposed by Chen (2005) and water relative permeability equation proposed in this work, then is possible to calculate the effective viscosity to match the flowing enthalpy from production test data. These preliminary relative permeabilities data could be used for initial modelling reservoir purposes, to determine the potential energy available and help to define possible technology to use.

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