14-11 Reservoirs-PorPerm

14-11 Reservoirs-PorPerm - Reservoirs Porosity and...

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Unformatted text preview: Reservoirs Porosity and Permeability Reservoir rock http://mpgpetroleum.com/images/pores.gif http://mpgpetroleum.com/images/pores2.gif Porosity: small open spaces between grains Permeability: connections between pores Porosity ( ) Sum of openings or voids within a rock Expressed as percent or decimal value = bulk volume - grain volume 100 bulk volume Where: bd = dry bulk density g = grain density = 1 bd g Effective Porosity Porosity that is available to storage of fluids Interconnected pores Does NOT include: isolated pores non-interconnected pores Wettability Measure of the ability of a fluid to coat the rock or mineral surface In Oil/Water system: Wetting phase forms acute angle with surface Non-wetting phase forms obtuse angle Wettability Laudon, Robert C., 1996, Petroleum Development Geology, Prentice Hall, p. 102 Wettability Most Reservoir Rocks = water wet Most Oil Source Rocks = oil wet Some carbonate reservoirs = mixed Irreducible (Water/Oil) Percentage of effective porosity occupied by wetting phase that cannot be removed on introduction of non-wetting fluid In water wet system = Irreducible water is connate water that cannot be driven out, no matter what the pressure To move this water need to change the wettability of the system Residual (Oil or Gas) Percentage of non-wetting phase - Oil or - Gas left in the ground after removal of that phase by production or by natural geologic processes Recovery Efficiency (RE) RE = 1 residual oil or gas (as decimal) Both recovery efficiency and residual percentages may be changed by increasing Pressure Water flooding Secondary or Tertiary recovery techniques Premeability (k) Measure of the ease with which a fluid can flow through a material Defined by Darcys Law Expressed in darcies or millidarcies Flow Rate - Darcys Law Laudon, Robert C., 1996, Petroleum Development Geology, Prentice Hall, p. 103 Permeability for Radial Flow Rearrangement of Darcys Law for radial flow...
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This note was uploaded on 10/11/2011 for the course GEOG 3413 taught by Professor Hileman during the Fall '10 term at Oklahoma State.

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14-11 Reservoirs-PorPerm - Reservoirs Porosity and...

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