Analysis of Development Planning of Own Use Gas Pipeline from Gas Compressor Stations to Gathering Stations in X Field

Trunkline gas network system from Gas Compressor Station (GCS) B to GS.B -GS.B5 total distance of ±18 km. Distance GS.B4-GS.B5 is 9400 m. Gas is the main fuel for engines at gathering stations. A deadlock was found on the GS.B4–GS.B5 pipeline. The solution to this problem is to plan a pipeline between GS.B4–GS.B5 for optimal gas supply. This study conducts an economic analysis of the planning of pipe construction with the same trunkline diameter. Selection of diameter by looking at the effect of pressure drop and erosional velocity using the Pipesim. Then take a problem solving approach by building a system using a pig launcher. Based on the research results, in the existing conditions with a distance of 9400 m using a diameter of 6 and 4 inches there is a high pressure drop. Scenario planning minimizes pressure drop by using equal diameter pipes between 4,6 and 8 inches. The analysis results show that the selected diameter is 6 inches. Pig launcher is designed with safe specs and design. Calculation of the project's economic indicators with an investment of 505,911 US$ M and an oil price of 62.38 US$/bbl. Calculation results obtained NPV @12%= 6,022 US$M, IRR= 495%, POT= 0.19 years, PI= 12.90. Sensitivity analysis by changing assumptions 85%, 115% of the basic assumptions, showed the lowest NPV= 4,725 US$M, the lowest IRR= 393%. Based on the results, this project is profitable and feasible to be developed from an economic perspective.