Gas Reservoirs: 2021 #20

True statements about drive mechanisms include (select any that apply):
__ From a reservoir viewpoint, dry and wet gas cannot be treated similarly in terms of production characteristics.
__ From a reservoir viewpoint, dry and wet gas cannot be treated similarly in terms of pressure behavior.
__ From a reservoir viewpoint, dry and wet gas cannot be treated similarly in terms of recovery potential.
__ A retrograde-condensate gas reservoir initially contains a single-phase fluid, which changes to two phases (condensate and gas) in the reservoir when the reservoir pressure decreases.
__ The term “condensate” is often applied to light hydrocarbon liquid produced from a gas well.
__ The term “condensate reservoir” should be applied only to situations in which condensate is actually formed in the reservoir because of retrograde behavior.
__ For both wet and dry gasses, reservoir engineering calculations are based on a single-phase reservoir gas.
__ The effect of a weak to moderate waterdrive is often difficult to detect from a simple p/z plot.
__ Depletion behavior of retrograde-condensate reservoirs can be handled through the p/z analyses with the caveat that the z-factor must be the two-phase z factor.

Once again, remember the provided Reference Guide will offer no assistance on these types of word problems. Most of these word-style questions will come from the SPE Handbook Series (as well as the SPE Textbook Series (TS). So a good study plan is to read the parts of the HS you lack experience with.

Click the button for the answer, along with commentary and SPE references sourced. Feel free to ask questions in the comment box below.

__ From a reservoir viewpoint, dry and wet gas can be treated similarly in terms of production characteristics (HS5 P981).
__ From a reservoir viewpoint, dry and wet gas can be treated similarly in terms of pressure behavior (HS5 P981).
__ From a reservoir viewpoint, dry and wet gas can be treated similarly in terms of recovery potential (HS5 P981).
 X A retrograde-condensate gas reservoir initially contains a single-phase fluid, which changes to two phases (condensate and gas) in the reservoir when the reservoir pressure decreases (HS5 P981).
 X The term “condensate” is often applied to light hydrocarbon liquid produced from a gas well (HS5 P982).
 X The term “condensate reservoir” should be applied only to situations in which condensate is actually formed in the reservoir because of retrograde behavior (HS5 P982).
 X For both wet and dry gasses, reservoir engineering calculations are based on a single-phase reservoir gas (HS5 P983).
 X The effect of a weak to moderate waterdrive is often difficult to detect from a simple p/z plot (HS5 P1022).
 X Depletion behavior of retrograde-condensate reservoirs can be handled through the p/z analyses with the caveat that the z-factor must be the two-phase z factor (HS5 P1024).