Well Intervention and Enhancement in Dieng Geothermal Field, Indonesia

Abstract

PT Geo Dipa Energi, (Persero) started developing Dieng Geothermal Field in 2002 and has since implemented operational strategies to sustain steam supply to the installed plant capacity of 60 MWe. Periodically, the company conducted a candidate selection and prioritization of the wells for well workover and enhancement to address steam supply and injection capacity shortfall. The results of evaluation formed the basis in implementing a well intervention and acid stimulation campaign for the prioritized candidate production and injection wells in Dieng Geothermal Field. Improvements were initiated in terms of well testing and analyses and acid treatment design to increase the effectiveness of the well stimulation. The use of electronic pressure-temperature-spinner logs and improved well test interpretation became essential for better candidate selection, acid treatment design, quantification of pre-acidizing well parameters and evaluation of acidizing results. To date, acid stimulation program has been successfully implemented in three production wells and two injection wells. Considerable improvement in production and injection capacities of these wells were attained that improved the operational level of the power plant in Dieng Geothermal Field.