H Field Development: Past, Present, and Future – A Journey to Achieve New Peak Production after 35 Years of Depletion

Abstract

H Field was discovered in 1975 and starting the first production in 1983. The first peak oil production was achieved in 1987 and then continued decline. In 2017, a subsurface study was conducted by re-interpretation of existing 2D-seismic data, well logs, and formation evaluation with result local attic opportunity and generate recommendation to execute drilling campaign. After 35 years of production, a drilling program consist of three infill wells were executed in 2018 and delivering a very success result by achieving a second peak oil production with incremental production 300% from existing baseline. By the success of these three infill wells, a followed-up drilling campaign consist of four infill wells was initiated and executed in 2021 which again had yielded good result to deliver the third peak production. To reduce further geological uncertainty, a 3D-seismic package will be acquisitioned in 2023 and will be used for further development infill wells. Throughout the last 5 years activity, various challenges, and uncertainties from subsurface and surface have been overcome such as 2D-seismic, structural geology, fluid contacts, deep well drilling, Low-Quality Reservoir (LQR), limited fluid flow, early water breakthrough, high reservoir temperature, high wellhead pressure, and aging flow line. This paper illustrated the chronology and lesson learned of H Field journey, from initial development to recent development, and its future development.