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PETE311_06A_Class08_(Maggard)

# PETE311_06A_Class08_(Maggard) - PERMEABILITY Gas Flow in...

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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
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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