Integrated Reservoir Modelling of the Piltun-Astokhskoye Oil and Gas Condensate Field: Sustaining Field Development and Strategy for Company Growth

Abstract

This paper presents the major steps of a new integrated Reservoir Management Plan (iRMP) for the Piltun-Astokhskoye (PA) oil and gas condensate field, located offshore in the Sea of Okhotsk, off the North-Eastern coast of Sakhalin Island, Russian Federation (RF). This recaps background information about the previous RMPs which were prepared separately for the Astokh and Piltun Areas, the main challenges, outcomes and perspectives. The new iRMP-PA 2019 elaborates multiple field development scenarios implying large capital expenditures. The main purpose of this is in establishing a sustainable Field Development Plan (FDP) with considering the acquired experience and maximising the hydrocarbon ultimate recovery and the profit both for the Russian State and for the Company. The delivery of the iRMP-PA 2019 project allowed the Company to actualise its portfolio of geological and recoverable reserves in the RF State Reserves Balance. The new FDP with an optimised drilling sequence, long-term forecasts, reservoir data acquisition and pilot production programme has been reviewed and endorsed by the RF Central Development Commission. This will help extend the field life through maturation of contingent resources and through optimising the reservoir management strategy for all the assets.