Abstract

The world practice has shown that the development of shelf multi-reservoir fields is associated with challenges when forming a development system due to reservoir heterogeneity, lateral mismatch of productive reservoirs, as well as technological challenges related to well design and construction.

Wells on an offshore platform can be both multi-lateral vertical with dual-completions and targeted horizontal extended-reach wells (ERW). The operation of such wells imposes obligations on a subsoil user to perform regular PLT in order to organize well interventions (WI), to use innovative technologies for active inflow control, which, in turn, is a highly effective way to control water inflows from highly permeable intervals and gas inflows from gas caps.

The production well pattern is formed with the utmost precision and detail. When drilling from the shore or from a platform, there is a risk of wellbore crossing, therefore, spatial control over the well trajectories is carried out while drilling.

In order to maintain reservoir pressure (RPM), edge or peripheral water flooding is often used. In rare cases, barrier flooding is used, in particular, agent injection into the top of a structure, i.e. a gas cap.

The number of drilling slots when drilling from a platform is usually limited, therefore, in order to increase oil recovery, special attention is paid to identifying areas with low efficiency of reservoir pressure maintenance and to developing measures on conformance control and isolation of water-flooded intervals.

The paper describes the existing system for the development of a multi-reservoir field X and an analysis of the operation of development wells in order to identify problem areas. The effect of injection wells on offset production wells was analyzed and the possibility of auto-hydraulic fractures was assessed using the existing injection wells. Recommendations were given to increase oil recovery by optimizing the reservoir pressure maintenance system, to drill new wells, including multilaterals, in the conditions of the continental shelf from an offshore platform with a limited number of wellheads (slots) and infrastructure limitations related to compressor and separator capacity.

Key words:

water flooding optimization, dual completions, inflow control system, flow simulation model, water flooding system performance, auto hydraulic fracturing, multilateral wells, multi-reservoir field, gas caps, drilling slots, offshore platform

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Authors

A.V. Tropin, Specialist, LLC «Tyumen Petroleum Research Center»
79/1, Osipenko st., Tyumen, 625000, Russian Federation
E-mail: AVTropin@tnnc.rosneft.ru

A.T. Zhubanov, Head of Department, LLC «Tyumen Petroleum Research Center»
79/1, Osipenko st., Tyumen, 625000, Russian Federation
E-mail: ATZhubanov@tnnc.rosneft.ru

D.S. Malyushko, Specialist, LLC «Tyumen Petroleum Research Center»
79/1, Osipenko st., Tyumen, 625000, Russian Federation
E-mail: DSMalyushko@tnnc.rosneft.ru

T.A. Pospelova, PhD (Eng.), Deputy General Director for Research, LLC «Tyumen Petroleum Research Center»
79/1, Osipenko st., Tyumen, 625000, Russian Federation
E-mail: tapospelova@tnnc.rosneft.ru

A.S. Sergeev, Manager, LLC «Tyumen Petroleum Research Center»
79/1, Osipenko st., Tyumen, 625000, Russian Federation
E-mail: ASSergeev2@tnnc.rosneft.ru

For citation:

A.V. Tropin, A.T. Zhubanov, D.S. Malyushko, T.A. Pospelova, A.S. Sergeev Optimizacija realizuemoj sistemy razrabotki v uslovijah ogranichennogo fonda skvazhin na mnogoplastovom mestorozhdenii [Optimization of existing development system under conditions of limited wells in a multi-reservoir field]. Neftyanaya Provintsiya, No. 4(24), 2020. pp.129-148. DOI https://doi.org/10.25689/NP.2020.4.129-148 (in Russian)