Page 96 - Introduction to Petroleum Engineering

80 PROPERTIES OF RESERVOIR ROCK
4.5 aCTIVITIES

4.5.1 Further Reading

For more information about rock properties, see Dandekar (2013), Mavko et al.
(2009), and Batzle (2006).

4.5.2 True/False
4.1 Permeability is a measure of the flow capacity of a porous medium.
4.2 The distribution of porosity is heterogeneous if porosity is the same every-
where in the reservoir.
4.3 An oil–water transition zone is usually thicker than a gas–oil transition zone.
4.4 Viscosity is used in Darcy’s law.

4.5 Interstitial velocity is less than superficial velocity.
4.6 Bulk volume is the sum of grain volume and pore volume.
4.7 The Dykstra–Parsons coefficient is dimensionless.
4.8 The oil–water contact is usually found above the gas–oil contact in a reservoir
with free gas, oil, and water.
4.9 The value of permeability depends on the direction of fluid flow.
4.10 Real gas pseudopressure has the unit of pressure, such as psia.

4.5.3 Exercises
4.1 Estimate volumetric flow rate using Darcy’s law. Assume the permeability in a
cylindrical core is 100 md, the length of the core is 6 in, the diameter of the core
is 1 in., the pressure drop across the core is 10 psi, and the viscosity of liquid
passing through the core is 1.1 cp. Express volumetric flow rate in bbl/day.
4.2 The pressure at an injection well is 2000 psi and the pressure at a production
well is 1500 psi. The injection well and production well are separated by a dis-
tance of 1000 ft. The mobile fluid in the reservoir between the injection well
and the production well has a viscosity of 0.9 cp. The net thickness of the res-
ervoir is 15 ft and the effective width of the reservoir is 500 ft. Use the linear
version of Darcy’s law to fill in the following table. Assume the formation
volume factor of the mobile fluid is 1 RB/STB.

Permeability (md) Flow Rate from Injector to Producer (bbl/day)
1
10
100
1000