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Determine the required pressure differential for overbalance drilling to a depth of 7800 ft

Determine the required pressure differential for overbalance drilling to a depth of 7800 ft and mud density is 9.5 ppg. Given that the pore pressure is 3500 psi.

Consider below oil window graph and suggest at which depths

Consider below oil window graph and suggest at which depths you may expect the generation of heavy and light oils plus wet and dry gases, why?

Capillary pressure is plotted versus water saturation for five rock samples

Capillary pressure is plotted versus water saturation for five rock samples with permeabilities of 3 , 10, 30, 100, and 300md. Allocate the permeability values to the sample numbers. Which one is the best reservoir rock and why? You need to mention at least two reasons.