Reservoir Wettability
Given the fact that the wettability associated with the small pores do not get altered – irrespective of whether the reservoir is oil-wet or water-wet; and the smaller pores are always filled by water-phase in both water-wet and oil-wet reservoirs (oil has to over-come a huge capillary force exerted by water in smaller pores in order for the oil to enter into the smaller pores; and it is nearly impossible for the oil to over-come such capillary forces exerted by the water-phase associated with the smaller pores) – upon water-flooding;
(1) What exactly we mean by ‘larger pores’ – where, the water-phase (connate-water) gets wetted with the solid rock surface for a ‘water-wet reservoir’ (with predominant water in the middle of the pores); and the predominant oil-phase gets wetted with the solid rock surface for an oil-wet reservoir (with relatively smaller water in the middle of the pores)?
(2) How big are these ‘larger pores’ with reference to those ‘smaller pores’?
(3) Is there a ‘transition regime’ in between these two pores (smaller and larger) – corresponding to the ‘fractional wet’ (where both oil and water wets the solid rock surface with predominant oil in the middle of the pores)? If so, how about the ‘wettability’ in those ‘transition regime’?
(4) Whether the concept of either an ‘oil-wet’ reservoir or a ‘water-wet’ reservoir would re-main the same at various spatial locations along the flow direction towards the production well (which consists of the vertical cross-sectional area taken along the pay-zone thickness and the width of the reservoir; and that is perpendicular to the principle fluid flow direction)?
(5) Whether, the wetting preference of the solid rock surface of the reservoir would remain the same at various spatial locations (with vertical cross-sectional-area consisting of reservoir thickness and the reservoir width) along the flow direction towards the production well?
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