Publications

The Echo Field is located around 160 km from Jakarta and is part of the Offshore North West Java (ONWJ) concession in the Ardjuna basin operated by Pertamina Hulu Energy ONWJ. It is the largest oil field in the ONWJ concession. The field has been producing since 1971, and current production is around 13,500 BOPD from the Main and Massive formations. The Echo field consists of four areas, E-Main, E-East, E-South and E-West. The E-Main area development concentrated mainly on the upper zones, E-22, E-23, E-27 and E-29 zones. These zones have been developed well by primary and secondary recovery techniques. Integrated subsurface evaluation, including reservoir simulation, was performed to identify undrained and unswept zones. Recent drilling of well EB-1ST, targeting unswept zone in E-29 produced 980 BOPD at 8% water cut. Another opportunity in the lower zone, E-34AB, was overlooked in the field development because of its limited interpretation and poor reservoir quality based on pressure transient analysis. The E-34AB zone has low porosity and permeability of 17% and 40 md respectively. The hydraulic fracturing method has been applied on the recent drilling in well EB-6ST, resulting in a 3000-bopd initial rate of production from the E-34A sand. This paper presents the success story of the developing a mature asset and the plan to maximize oil and gas reserves from the E-29 zone and the E-34AB deeper target.