Revealed Banyu Urip New Opportunity: Integrated Subsurface Approach Leads to a Potential Field Production Increase Through Infill Wells Program

Abstract

Natural declining of oil and gas fields are inherent. It also occurs in the Banyu Urip field. Banyu Urip has been producing since 2009. The field has produced more than 540 million barrel oil (MMBO) with peak production around 220,000 barrel oil per day (BOPD) in 2021, currently producing about 170,000 BOPD. The field’s decline is observed from increasing gas to oil ratio (GOR) and water cut in almost all of the producer wells. The aim of this paper is to describe our efforts to offset Banyu Urip’s production decline by developing a new infill drilling program which has been characterized through an integrated approach by incorporating available static and updated dynamic data. Banyu Urip has a luxury set of subsurface data which we use to support the reservoir characterization and field performance analysis. Static and dynamic data, including production data and hydrocarbon contact monitoring are acquired regularly. In 2017, seismic data reprocessing was conducted with recent technology to improve data quality for better structural and stratigraphic interpretation. Integrating all of the available data with new interpretations and insights provided a better understanding of gross rock volume, reservoir characterization, fluid contact movement, subsurface risks uncertainties, and hydrocarbon volumes. Ultimately, improved geologic and reservoir simulation models were constructed that lead to identification of potential un-swept oil in the Banyu Urip carbonate reservoir area. Mining the existing data and applying new insights regarding subsurface evaluation and reservoir performance analysis resulted in new opportunity identification. The un-swept oil potential is identified mainly in the eastern and western areas. Several infill wells are planned to be drilled in late 2024 onwards which could generate incremental oil production to offset current decline and support national oil production.