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• W2897400866 abstract "Abstract The performance of many improved and enhanced oil recovery techniques in conventional reservoirs is frequently degraded by conformance problems. The presence of high permeability streaks or thief layers between injection and production wells typically results in pre-mature water breakthrough, high water cut and deficient volumetric sweep. As a result, significant oil volumes in the reservoir may not be contacted by the injection fluid. Several conformance improvement techniques (e.g. foams, gels, resins) have been developed and practiced in improved oil recovery operations. Each technique has its own advantages and limitations related to deployment practicality, effectiveness, and durability. In this paper, we introduce a novel conformance improvement method (CIM) that we consider to be practical, effective and durable. The CIM process consists of cyclical injections of pulse slugs of surfactant alternating with brine. The surfactant slug compositions are selected based on the rheological behavior of the microemulsion phase. The chemical slugs are configured such that the viscosity of the injected fluids is kept low to preserve injectivity and to ensure invasion of the conformance agent towards the thief zones. The trailing brine slugs are designed to produce a high-viscosity microemulsion as they mix with the leading surfactant slugs in the reservoir. The proposed process leads to a reduction in the effective mobility of the fluids in the thief layers. As a result, the chase waterflood would divert into previously uncontacted layers to improve sweep efficiency. The potential of the proposed CIM in improving oil recovery is demonstrated by various simulations of reservoir cases under waterflooding. We performed various sensitivities to investigate the effectiveness of the proposed process that include well-spacing, permeability contrast, size of the thief layers, heterogeneity, and size of the chemical pulse slugs. Simulations showed that this process is effective in addressing reservoir conformance issues, and therefore it has the potential to improve sweep efficiency and recovery factor in reservoir with distinct thief layers. The treatment surfactant volumes are relatively small, which enables this process to be cost-effective." @default.
• W2897400866 created "2018-10-26" @default.
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• W2897400866 date "2018-04-23" @default.
• W2897400866 modified "2023-09-30" @default.
• W2897400866 title "Conformance Improvement in Oil Reservoirs by Use of Microemulsions" @default.
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• W2897400866 doi "https://doi.org/10.2118/192289-ms" @default.
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