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Numerical simulation of Spontaneous Imbibition of Smart Water into Preferentially oil-wet Carbonate using ECLIPSE 100

Worku, Tewodros Sebsibe
Master thesis
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URI
http://hdl.handle.net/11250/2416807
Date
2016-06
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  • Master's theses (TN-IPT 2007-2017) [533]
Abstract
Spontaneous imbibition (SI) is the main recovery mechanism in low matrix perme-

ability, naturally fractured reservoirs. However, for imbibition to occur, the reservoir

rock should be preferentially water-wet. Several studies have indicated that smart

water may increase the water-wetness of an oil-wet carbonate reservoirs. Published

experimental data suggest that sulfate ion in the injected

fluid can alter wetting

state of the carbonate from preferentially oil-wet to water-wet.

Numerical and analytical models have been developed to describe SI process in

carbonate reservoirs. The suggested models attempt to capture the complex inter-

actions among different phases and species during SI process. In this study, using

the already existing surfactant model of ECLIPSE 100 simulator, dynamic e ect of

adsorption of sulfate on wettability alteration in core scale is modelled. Wettability

change option of the surfactant model is employed to capture change in wettability

due to adsorption of sulfate ion. Using the procedure of weight factor, wettability of

the core shifts dynamically from oil-wet to water-wet conditions proportional to the

adsorbed amount of sulfate. Laboratory experiments have been matched with the

established procedure.

The result showed that the wettability change option under surfactant model in

ECLIPSE 100 is capable of modelling the change in wettability due to adsorption of

sulfate ion. The model is able to predict experimental data using the procedure of

weight factor. Moreover, a correlation between weight factor and Amott wettability

index is established. The basic model that could be used for further investigations

or upscaling to field scale is established.
Description
Master's thesis in Petroleum technology
Publisher
University of Stavanger, Norway
Series
Masteroppgave/UIS-TN-IPT/2016;

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