Wellbore Simulation and Exergy Profile of Olkaria Domes

Abstract

This paper presents exergy in the wellbore. Exergy analysis is considered between the wellhead and 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 developed wellbore
model. The exergy profiles estimated feed zone depths for a directional well. The research investigated liquid-dominated Olkaria Domes wells, OW-908, OW-921 and OW-924.
The profiles predicted convective and conductive heat transfer points. For a range of wellhead temperatures, the reservoir temperatures and formation pressure from the wellbore simulator were calculated.
The thermodynamic parameters (temperature and pressure) from the wellbore simulator were input parameters in the (Engineers Equation Solver) EES code. The calculated values in EES were entropy, enthalpy, and specific exergy. 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.