SD-2D: a Case History on Geothermal Wellbore Enhancement, Mindanao Geothermal Production Field, Philippines

Abstract

Well intervention through casing perforation and acid treatment was performed on well SK-2D to improve its productivity. Post-acid completion tests conducted indicate significant permeability improvement in the perforated intervals and stimulation of the mud-damaged payzones, although initial discharge tests showed contribution from the stimulated bottom zone was masking the potential two-phase feed from the upper perforated sections. Subsequent short-term discharge tests and eventual commissioning of the well show recovery of the two-phase upper payzone and a remarkable output improvement. Wellbore simulation using flowing pressure-temperaturespinner (PATS) logs and discharge data suggests possible optimization of well utilization by controlling the bottom liquid feed zone and maximizing the contribution of the twophase zone.