Density, phase behavior keys to acid gas injection

An accurate fluid density is important for predicting injection pressures for acid gas disposal wells. The design engineer should carefully consider the method for estimating fluid density and should be aware of the shortcomings of commercial simulator packages. Each case needs to be considered individually for density, nonaqueous phase equilibrium, hydrate formation, and aqueous phase formation. The engineer should make his own approximate PVT diagram and phase envelope to ensure that the computer-generated results are not misleading. As a rule of thumb, if the injection well pressures are greater than about 10 MPa (1,450 psia), then a second nonaqueous phase will generally not form...

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