| Abstract |
Pertamina Geothermal Energy ( PGE ) operates geothermal steam fields in Lahendong, North Sulawesi, Indonesia; by supplying steam to PLN's GPP Unit 1, 2, 3, and 4 from 6 production clusters, which are cluster 4, 13, 13B, 24, 5 and 37. Steam from cluster 4 and 13 supply the GPP Unit 1&2, while steam from cluster 13B, 24, 5 and 37 supply the GPP Unit 3&4. By 2017??, the steam production from LHD-23 (cluster 5) and LHD-28 (cluster 24) decline after well remedial. Previously, the steam supply mass flow for Unit 3&4 from LHD-23 was 212 ton/h and LHD-28 was 184 ton/h, however after remedial, the flow reduced to 20 ton/h for LHD-23 and 109 ton/h for LHD-28. The steam supply problem also occur in the steam pipeline due to a bottleneck in the steam pipeline from cluster 13B (LHD-48) which has only 14†NPS thus the maximum steam flow limited to 90 ton/h whereas there are 3 high potential production wells in the cluster (approximately total steam flow 300 ton/h). This has led to an alternative solution to fulfill the steam supply for unit 3&4 by developing a new independent pipeline to maximize high potential wells in cluster 13B (LHD-47, 48 and 49). However, the NCG of LHD-47 is higher than the other two wells, so we did simulation to mix the fluids from those 3 wells and design the pipeline interconnection between the new and existing line. The new pipeline design is 24†NPS and built in parallel with existing pipeline. This pipeline accommodate the steam produced from three wells at cluster 13B and the NCG value meet the steam supply requirements of GPP Unit 3&4. |