Economic Evaluation of an Associated Gas Production Facility: A Case Study of X Field in Southern Nigeria

A surface production facility is an integral part of a gas oil separation process (GOSP) plant. In this study, an economic evaluation of two field handling alternatives for associated gas recovery in an integrated surface production facility located in X Field in Southern Nigeria is performed. The process alternatives evaluated were a four-stage separation facility with four compressors and a four-stage separation facility with three compressors, respectively. The former is the baseline facility at the X Field while the latter is an optimized version of the baseline facility. The economic assessments of the two alternatives were compared. Depending on the alternatives, the crude oil and associated gas facility could produce up to 48,470 to 50,090 bbl/day of crude oil and 50.27 to 50.48 MMSCFD of associated gas. The capital costs (CAPEX), operating costs (OPEX), revenue (REV), and energy demand (ED) for the baseline scenario and its optimized alternative were calculated. The CAPEX for the baseline and optimized scenarios are approximately 24,701,200 USD and 17,491,800 USD, respectively, while the OPEX are approx