Evaluasi Keekonomian Pekerjaan Workover Perforasi Pada Sumur X Di Lapangan Y Menggunakan Skema Production Sharing Contract Dan Grossplit

The success of a job is seen from its economic parameters. The need for an economic evaluation of perforation work is very important because it will become a reference for perforation operations. A decrease in the rate of production in old wells is unavoidable. This case can be caused by several problems that occur during the production well. To overcome this is to do a rework operation or workover. A workover or rework of a well is an effort to improve productivity so that the desired production rate is restored. The goal to be achieved in this study is to evaluate the economic feasibility of a perforation work carried out again through analysis of well history data, cash flow data, and production data. Economic evaluation is calculated by economic indicators Net Present Value (NPV), Internal Rate of Return (IRR), Benefit Cost Ratio (B/C), Pay Out Time (POT). This study aims to determine the economics of the perforation work on well X in field Y using the PSC and Grossplit schemes where the profit sharing between the company and the state government is 81%:19% of production. Then calculate the economic indicators in the PSC scheme with an investment of X well X 108,150 US$ M at an oil price of US$ 61.96/bbl so that the results of calculating the NPV@15% value of X well = 596,098 US$ M, IRR of X well = 78%, B/C well X = 6.51, POT of well X = 0.26 years. The initial base split for the contractor is 43% after adding the variable and progressive components, the split for the contractor becomes 57%, calculating the economic indicators in the Grosssplit scheme with an X well investment of 108,150 US$M at an oil price of 61.96 US$/bbl so that the results of the calculation of the value are obtained NPV@15% of well X = 702,943 US$M, IRR of well X = 88%, B/C of well X = 7.50, POT of well X = 0.33 years. Sensitivity analysis on perforation work is done by changing the assumptions to 85% and 115%. From the results obtained, the value of oil prices is the parameter that most influences the NPV value then oil production, opex and investment. The critical point for the price of X well oil occurs when the oil price is reduced to 67%, namely at a price of 41.51 US$/bbl on the PSC scheme and 58%, namely at a price of 35.93 US$/bbl on the Grosssplit scheme. From the calculation of profit indicators and sensitivity analysis, it can be concluded that the perforation work is feasible because it meets the eligibility requirements of a project. Keywords : Benefit Cost Ratio (B/C), Cash Flow, Cash In, Cash Out, Internal Rate of Return (IRR), Net Present Value (NPV), Pay Out Time (POT), Production sharing contract (PSC), Perforasi