Sweep Efficiency Increasing of Fractured Oil-Wet Reservoirs: Case Study of Central Khoreyver Uplift Fields

Abstract

Reserves decline of oil fields with fractured carbonate reservoir is crucially complicated due to formation vertical heterogeneity, occurrence of separate filtration pathways and as a consequence poor sweep efficiency of reservoir development both in vertical and lateral direction. As a result – there is a failure to achieve expected level of recovery factor. To its simplest extent there is no clear understanding of mechanism of reserves recovery, quite how the process of oil displacement happens: either in vertical direction or in a layered way. More uncertainties in the research process are brought by active aquifer, reservoir pressure maintenance system directly below the OWC and nonuniform recovery at vertical scale. The results of systematic survey of sweep efficiency increasing of oil-wet fractured carbonates are reviewed on the article using the case study of Central Khoreyver Uplift fields (CKU) of LLC «JC «RUSVIETPETRO» company.