Capillary Retention:
Since the ‘capillary pull of the sand’ will remain different along the flow direction towards the production well, the ‘zone of capillary retention’ also will be varying in thickness – towards the production well. If so, what exactly determines the slope and thickness of the ‘zone of capillary retention’ – when an oil reservoir is drained by primary recovery?
How exactly to deduce the ‘angle of repose’ in an oil field that requires the details on ‘the quantum of resistance offered by the formation to the oil movement’ against the gravitational force that tends to move the residual oil into the wells?
Whether all the residual oil will tend to settle down – under the influence of gravity – ONLY – at the bottom of the reservoir – below the region of gravitationally drained oil sand?
OR
Can we expect any fraction of residual oil in the region of gravitationally drained oil sand as well?
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