| Abstract |
Well AWI 9-9 was recently drilled at the Salak (also known as Awibengkok) Geothermal Field, West Java, Indonesia, as a make-up steam supply well to support full load power generation at the 377 MWe power facilities. The well was also drilled to provide information on the temperatures in and the permeability of the undrilled portion of the southwest area of the Awibengkok field. AWI 9-9 was completed in 21 days to a total depth (TD) of 10,402 ft (3,170 m) making it the deepest production well drilled in the Awibengkok reservoir. The well completion test indicated that AWI 9-9 has interzonal flow with the upflowing hot (610 .F or 321 .C) reservoir fluid from the bottom feed zone exiting the feed zone at ~6,532f (1,991 m) MD. The presence of an interzonal flow at AWI 9-9 creates difficulties in assessing the actual reservoir parameters encountered by the well. Adjustment of the conventional geothermal well characterization method thus needed to be made in order to fully characterize the well. The wellfs unique subsurface condition also increased the risk of well control issues so these risks needed to be fully understand and mitigated. The bottom entry in this well, the deepest permeable entry identified to date (10,032f or 3,058 m MD), confirms the interpretation of deep permeability at the Awibengkok reservoir. The presence of the deep feed zone in the MVS indicated that this formation is still permeable to sustain commercial production. The depth of recorded microseismicity events suggests that permeability could extend as deep as 13,000f (~4,000 m) BSL. At this depth, it is possible that supercritical fluid exists and that it can be harnessed to generate power outputs in order of magnitude greater than from conventional high-temperature fluid. |