This paper presents exergy in the wellbore. Exergy analysis is considered between the wellhead to the reservoir with geothermal brine at saturated conditions. The field data input parameters were wellhead pressure, mass flow rates of steam and brine, wellbore diameter, and the reservoir depths (deeper/2nd depth and shallow). The pressure-temperature (PT) profile was simulated using the wellbore model developed in 1988. The exergy profiles estimated feed zone depths of -1000 - (-)2800 m.a.s.l for a directional well. The profiles predicted convective and conductive heat transfers points. For wellhead temperatures of between 184oC, the reservoir temperatures from the wellbore simulator are high at 250 oC, and formation pressure is between 3,978 kPa. Exergy wellbore simulation of the geothermal reservoir predicted the geological stratification of the geothermal field. The study demonstrates the importance of connecting the reservoir and wellhead via a wellbore simulation and exergy profiles.

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