PETE311_06A_Class08_(Maggard)

PETE311_06A_Class08_ - PERMEABILITY Gas Flow in Porous Media Gas Flow vs Liquid Flow Gas density is a function of pressure(for isothermal reservoir

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PERMEABILITY Gas Flow in Porous Media
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Gas Flow vs. Liquid Flow • Gas density is a function of pressure (for isothermal reservoir conditions) – Real Gas Law – We cannot assume gas flow in the reservoir is incompressible • Gas density determined from Real Gas Law – Darcy’s Law describes volumetric flow rate of gas flow at reservoir conditions ( in situ ) T R z M γ p ρ air g g = conditions standard reservoir znT pV znT pV R = = = = ds dp μ k A q v g g s
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Gas Flow vs. Liquid Flow – Gas value is appraised at standard conditions • Standard Temperature and Pressure •q g,sc [scf/day] is mass flow rate (for specified γ g ) – For steady state flow conditions in the reservoir, as flow proceeds along the flow path: • Mass flow rate, q g,sc , is constant • Pressure decreases • Density decreases • Volumetric flow rate, q g , increases [days] dt [Mscf/day] q [$/Mscf] Price [$] Income 2 1 t t sc g, =
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Gas Formation Volume Factor – Given a volumetric gas flow rate at reservoir conditions, q g , we need to determine the mass flow rate, q g,sc •B g has oilfield units of [rcf/scf] – scf is a specified mass of gas (i.e. number of moles)
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This note was uploaded on 12/03/2009 for the course PETE 311 taught by Professor Staff during the Spring '08 term at Texas A&M.

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PETE311_06A_Class08_ - PERMEABILITY Gas Flow in Porous Media Gas Flow vs Liquid Flow Gas density is a function of pressure(for isothermal reservoir

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