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|Competition=[[2021 Middle East Wiki Write Off]]

|Competition=[[2021 Middle East Wiki Write Off]]

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Reservoir fluids can be classified into five different categories: black oil, volatile oil, gas condensates, wet gas, and dry gas. The classification of the fluid can be determined by laboratory analysis and from field data. This is summarized in Table 1 below. Gas condensate reservoirs usually experience the condensate banking effect. Condensate occurs when either the reservoir pressure of a gas reservoir or the bottom-hole pressure falls below the dew point. Condensate is usually known for impeding productivity, however, different mobility zones occur due to the existence of two phases and the various forces acting upon the rock and fluid. The best approach to understand the performance of a gas condensate well is by analyzing the transient data during pressure build up, which can help to understand the condensate region in terms of its size, mobility reduction, and how it affects the well productivity.

Reservoir fluids can be classified into five different categories: black oil, volatile oil, gas condensates, wet gas, and dry gas. The classification of the fluid can be determined by laboratory analysis and from field data. This is summarized Table 1 below. Gas condensate reservoirs usually experience the condensate banking effect. Condensate occurs when either the reservoir pressure of a gas reservoir or the bottom-hole pressure falls below the dew point. Condensate is usually known for impeding productivity, however, different mobility zones occur due to the existence of two phases and the various forces acting upon the rock and fluid. The best approach to understand the performance of a gas condensate well is by analyzing the transient data during pressure build up, which can help to understand the condensate region in terms of its size, mobility reduction, and how it affects the well productivity.

{| class = "wikitable"

{| class = "wikitable"

| Dry gas || - || - || - || - || No phase change || - || >cricondentherm

| Dry gas || - || - || - || - || No phase change || - || >cricondentherm

|}

|}

==Gas condensate reservoirs==

==Gas condensate reservoirs==

Gas condensate reservoirs are also referred to as retrograde gas reservoirs, duly named in reference to the phase behavior of the fluid, which exhibits retrograde condensation over time (Dandekar, 2006). This can be seen in [[:file:AlAhmadiTawfiqFigure1.jpg|Figure 1]]. As gas is produced, the reservoir pressure decreases until it reaches the dew point (point 2), where the first drop of liquid forms. The percent liquid saturation increases as pressure is decreased, reaching a maximum (point 3). The liquid saturation then decreases as pressure is decreased further and the liquid re-vaporizes (red line); exhibiting the referenced retrograde condensation.<ref name=Parvizi_2009 />  

Gas condensate reservoirs are also referred to as retrograde gas reservoirs, duly named in reference to the phase behavior of the fluid, which exhibits retrograde condensation over time (Dandekar, 2006). This can be seen in [[:file:AlAhmadiTawfiqFigure1.jpg|Figure 1]]. As gas is produced, the reservoir pressure decreases until it reaches the dew point (point 2), where the first drop of liquid forms. The percent liquid saturation increases as pressure is decreased, reaching a maximum (point 3). The liquid saturation then decreases as pressure is decreased further and the liquid re-vaporizes (red line); exhibiting the referenced retrograde condensation.<ref name=Parvizi_2009 />  

==Laboratory tests to simulate condensate production==

==Laboratory tests to simulate condensate production==