Search

The typical standard geothermal well-slotted liner is a 7", research on big hole slotted liner to increase steam production in geothermal fields. In the previous study, the potential of the geothermal field was 380 Mwe, while currently it has been produced at 39.79 Mwe so that the field geothermal is feasible to develop again. The current conditions there are 7 production wells with a standard hole (7 "liners) that have been proven to produce continuously in developing this production will simulate using the big-hole size slotted liner, starting at 8 5/8", 9 5/8 ", 10 ¾ ". With proven reservoir condition data, the geothermal field is feasible for production studies using big holes. The main parameters include Temperature, Pressure, mass flow, and steam quality.The conceptual model is an interpretation of the condition of the reservoir so that the reservoir conditions in the well can identify as data for the study. WellSim Simulator is used to predict pressure loss in the hole and bottom surface, and vice versa. The output is the pressure, mass flow rate, temperature, and steam quality of the wellhead so that various casing sizes can simulate with the condition of the reservoir. The optimal size of the production liner developed in the geothermal field is 9 5/8 ". [ABSTRACT FROM AUTHOR]

Geothermal is a potential renewable energy source to be developed in Indonesia. Indonesia's geothermal energy potential is recorded at 28,579 MW but only used for electricity generation of around 1,948.5 MW. Investment in geothermal power plants is an investment that is capital intensive with high investment risk factors. This study aims to determine the financial feasibility of investing in geothermal power plants in the Gedongsongo geothermal field with 55 MWe of potential electrical energy. Also, research is conducted to find out from the beginning of the project implementation to the end of the project's economic life and to determine the feasibility level of the financial feasibility of investment in the project. The results of investment analysis using sensitivity analysis, indicating that price movements in project calculations have a significant influence on changes in NPV. Sensitivity analysis is carried out on several parameters that affect the project value (in the form of NPV) with a Low Case of 70% parameter value and High Case of 130%. The inflation rate for operating costs such as O & M, Make-Up Well Drilling, and Overhaul is assumed to be 2% per year. Project financing is expected to originate from personal capital of 30% and loans of 70% with interest rates (interest) of 4% per year. To get the value of the internal rate of return on personal capital or the Equity Internal Rate of Return by PLN standards of 14%, the electricity tariff for the Gedongsongo Geothermal power plant is 11.47 cents/ kWh. [ABSTRACT FROM AUTHOR]

Drilling is a critical activity in the development of geothermal energy either in exploration or exploitation phases. The drilling operation aims to make the wellbore under the desired target, function, and time by upholding the principles of engineering and safety. There are many challenges and obstacles faced in drilling operations that make drilling time and activities not according to the plan. These technical or non-technical issues may lead to the presence of non-productive time (NPT) and cost overruns. Analysis of drilling time is essential as an evaluation material for better implementation, and also as a consideration for planning to drill the new wells. This paper will analyze the drilling time to identify activities that contribute to non-productive time (NPT) in the drilling operation of well FT and provide prevention and mitigation solutions. Data analyzed were obtained from the daily drilling report (DDR). [ABSTRACT FROM AUTHOR]