Utilisation of PTS Surveys for Well Studies in the Hatchobaru Geothermal Field

Abstract

PTS pressure, temperature, and spinner) surveys under static, injection and flowing conditions were started in 1993 in the Hatchobaru geothermal field. Trough the results of these surveys, the mass flow rates at each feed point or at each injection point was estimated Also, the behavior of the reservoir fluids close to the wellbore was studied. Utilizing the location of feed points detected by the PTS surveys the assumed position of faults in this area were updated or confirmed. Using a wellbore simulator, the enthalpy of fluids at the feed points was also estimated and the behavior of the fluids within the wellbore was better understood. In summary, the results of these studies have been very useful for the reservoir management operations.