PETE 2031 Chapter 7

The property _______ in Darcy’s Law is defined as the absolute permeability of the rock.

is a rock property (like porosity, density, etc.)

Darcy’s Law was defined with only one phase flowing.

What happens when more than one phase is present, say oil and water?

• If an initially water filled core is flooded with oil until only oil is produced from the outlet end, a water saturation will continue to exist in the core.

• At this oil and water saturation, only oil is flowing and the water is immobile.

• If an initially water filled core is flooded with oil until only oil is produced from the outlet end, a oil saturation will continue to exist in the core.

• At this oil and water saturation, only water is flowing and the oil is immobile.

The water saturation is known as the _________________ or _________________ water saturation and is abbreviated as Swir or Swc.

The immobile water interferes with the flow of oil and the ______________ permeability of the oil is less than the ______________ permeability of the rock.

Schematic of Irreducible Water Saturation

___________ is Immobile and Only _____ is Flowing

If we reverse the process and waterflood the oil saturated core with water, no _____ is produced from the core, and _________________________ will remain in the core

The saturation is know as as the ____________________ oil saturation and is abbreviated Sor.  The residual oil interferes with the flow of _______ and the __________________ permeability of the water is less than the ________________ permeability.

This interference to flow when more than one phase is present leads to the definition of ______________________________.  It's defined as the effective permeability to a phase divided by the absolute permeability.