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PETROMAKS2-Stort program petroleum

Low salinity water flooding of North Sea reservoirs: Physical and chemical effects

Tildelt: kr 9,0 mill.

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A routine/1D-model for simulation of low salinity floods at laboratory scale will be established. A function describing the effect of salinity reduction on the flow saturation functions will be included in the model. Experiments will be carried out to est ablish descriptions of the main mechanisms in low salinity water flooding. The model will be validated by comparing the modelling results with core flooding experiments. Special designed experiments will be important in validation of the model. Reservoir sandstone rocks with different mineral compositions and distributions will be selected. The oil composition, brine composition, core dimensions and temperature will be varied. Rocks will be characterised (mineral composition and distribution) before and after core floods. More detailed studies of mechanisms will be carried out by flooding of columns of minerals and mineral mixtures, and cores. The effects of adsorption and desorption of polar oil components, and ion-exchange (minerals and reservoir rock) on zeta potential and contact angle will be studied. Chemical modelling will include: Incorporate surface chemistry in the existing chemical modelling software EQAlt (Cathles 2006). Predict surface potential as a function of the aqueous chemistry, pres sure and temperature. Include oil rock interactions in the chemical model, guided by experiments performed Predict water flooding behaviour by the chemical model. Validation of the 1D-model will be carried out to verify that the model is capable of captur ing important effects of low salinity on oil recovery. Larger scale: A simple extension to a water flood simulator that can be used to translate laboratory results into field scale estimates of low salinity water flooding processes will be worked out. Po tential at larger scale will be evaluated using real or realistic sandstone reservoir models. A tool/best practice suitable for evaluation of potential for sandstone reservoirs will be established.

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PETROMAKS2-Stort program petroleum