Abstract

The processes of establishing and altering reservoir wettability are still subjects of discussion due to the complexity of the underlying crude oil–brine–rock interactions. This study was aimed at ...

Highlights

  • Reservoir wettability is a complex property of crude oil−brine− rock (COBR) systems, which is determined by interactions between reservoir fluids and rock surfaces in their contact zones

  • The initial wettability of a rock is a result of chemical interactions between all phases in the COBR system: the crude oil, rock, and the initial brine phase

  • This research work is a fundamental study aimed to improve the understanding of surface chemistry in COBR systems

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Summary

Introduction

Reservoir wettability is a complex property of crude oil−brine− rock (COBR) systems, which is determined by interactions between reservoir fluids and rock surfaces in their contact zones. When changing the parameters of COBR systems such as crude oil/brine composition or rock mineralogy, the wettability can change. Based on these principles, the possibility of wettability alteration to a more water-wet state during water injection is widely studied around the globe in terms of enhanced oil recovery (EOR) methods. The possibility of wettability alteration to a more water-wet state during water injection is widely studied around the globe in terms of enhanced oil recovery (EOR) methods These EOR methods are based on the modification of the ionic composition of injection brine, known as Smart Water EOR or low salinity injection for specific systems. The successful implementation of Smart Water EOR requires a good understanding and reasonable assessment of the wettability at a certain stage of reservoir development, hereafter called initial wettability

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