An Intergrated Analytical Method in Identifying the Remain Potential of Thin Bed Reservoir on Deltaic System, Sengata Field

Abstract

Abstract This paper presents an integrated and simplified method with some field cases that can be applied to delay rapid production depletion and it focuses on the occurrences of the potential bypassed oil zone. The method that we used in here is by combining geological approach, with reservoir production history map as a result of data obtained during infill drilling and subsequent well work activities in the wells in the aim to get the remaining potential of reservoir. The primary benefit is to extent the field life as long as possible before it become a Marginal Field. Well services are the common ways in maintaining production in every field, in this case Sengata Field. This aging onshore field has been developed by PT PERTAMINA EP since 1973 and the production reached its peak of 6000 BOPD in 1979 and with average decline rate of 60%, the field is on a fast declining trend. Like many other deltaic environment reservoirs in the world, the structures of this field is extremely sophisticated and consist of large number of reservoirs and most of them are thin bed reservoir and multiple stacked channels that contain oil, gas and formation water. The observed drive mechanisms consists of a combination of Solution Gas Drive and Water Drive The complicated geometry is a serious challenge for engineers who are responsible for determining lateral and vertical communication between the individual sand units. Recent analytical method has been proven very successful in sustaining and revitalizing production shown by the oil increment up to 110% for it's target and allows PERTAMINA EP to optimize and prolong the field life.