Design of development strategy for a partially breaked-up oil-rim reservoirs

   Introduction. It is well known that early development of a gas cap results in migration and loss of oil from the oil rim. The process is poorly studied worldwide. Existing methods for estimation the degree of oil smearing for given reservoir properties and gas recovery efficiency are mainly applicable for underlying oil rims and overestimate the degree of oil smearing for marginal oil rims.

   Aim. The aim of the work is to develop a set of guidelines for carrying out analysis and development planning for the marginal oil rims during early development of a gas cap. A large gas condensate field located in Western Siberia is considered as a case study.

   Materials and methods. The paper introduces an approach for estimation of spatial distribution of oil reserves for marginal oil rims based on reservoir simulation which accounts both all available well surveys and conceptual geological model.

   Results. As a result of the case study a new approach for estimation the degree of oil smearing for reservoirs with marginal oil rims during early development of the gas cap is developed. Besides that, a set of guidelines for surveys design, analysis and accounting their results during development planning of oil rims are produced.

   Conclusion. Introduced approaches and guidelines for analysis and development planning for reservoirs with marginal oil rims allow to mitigate risks in estimation of production potential and develop optimal reservoir management strategy. Considered solutions can be applied to reservoirs with similar confi guration of fluids saturation.

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