STUDY OF INCREASE GEOTHERMAL WELL PRODUCTION RATE WITH DOWNHOLE PUMP INSTALLATION FOR UTILIZATION IN POWER PLANT

• Main Author: Prabowo, Ricky
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/48336
• Institution: Institut Teknologi Bandung

Geothermal well is one of main components in geothermal filed. The well has function to facilitate fluid from reservoir towards surface. Based on condition to discharge fluid toward surface, wells are categorized as self discharge wells (able to discharge naturally to surface) and non self discharge well (not yet able to discharge naturally to surface). For wells that categorized as non-artesian wells or have low rate of production, special efforts need to be made base on condition and characteristic of the wells. For wells that have low pressure and low medium temperature, but with high permeability, an artificial method can be implemented, which is use of downhole pump technology, namely electrical submersible pump (ESP) or line shaft pump (LSP). This condition also occurs in wells in Tulehu geothermal field. Downhole pump technology has been developed in several geothermal fields in other countries and has been proven to increase geothermal well production. The purpose of this research is to determine appropriate engineering design for downhole pump in well in Tulehu field, calculate net power output produced by ORC plant, and conduct economic analysis of project over the next 25 years. The research method was carried out analytically starting form evaluating and analyzing results of well testing to determine condition and characteristic of the well, performing technical design calculation for downhole pump implementation, calculating ORC cycle analysis of power plant to obtain net power generated, and conduct economic analysis to obtain IRR and NPV. From the result of research, ideal pump setting depth at 600 meter depth that produce mass flow rate 42,84 kg/s. Optimum ORC scheme with butane working fluid and ESP H 22500N produce net power output 1,21 MW and economic analysis produce IRR value 11% for investment cost consider production well drilling cost.