| Abstract |
A Pressure Temperature Spinner (PTS) logging program, conducted over a three year period, documents a spatial and temporal evolution of both enthalpy and superheat in the Units 13 and 16 areas at the Geysers. Wells producing form the more depleted reservoir area in the southern part of Unit 13 exhibit a greater downhole superheat (up to 80°F), and wellbore enthalpy (>1230 Btu/lbm) than those producing in less disturbed portions of the reservoir. Further, a downhole enthalpy calculations from a single well clearly show that the enthalpy at depth is increasing with time. Finally, the combination of high permeability, reduced pressure and increasing superheated wellbore conditions identifies the southern portion of Unit 13 as an appropriate injection target. |