Prediction of Oil Rim in Petroleum Reservoir Based on Compositional Gradients: A Real Case Study from Haripur Field.

Abstract

The first oil producing field is Haripur Field, from the well no. SY-7 the reservoir produced approximately 0.53 MMSTB of oil with average flow rate 207 STB/D starting at 1987 and end at 1994 which make interest among the reservoir engineers for further investigation to delineate the oil bearing zone. Compositional gradient analysis is a proven and authentic technology to detect the gas-oil-contact (GOC) in the reservoir fluid column by collecting a reservoir fluid sample from a reference depth. In this study oil sample is collected at depth 2030 m and analyzed its Pressure Volume Temperature (PVT) properties with PVT cell to determine composition and API gravity. From this investigation outcome a compositional grading in the reservoir fluid column is modeled and detected the gas-oil-contact (GOC). The compositional grading model is validate by the seven years oil production rate and tube head pressure history matching through reservoir simulation study.