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26 de abr. de 2017 · 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. Additional condensate forms with changes in pressure and temperature in the tubing and during lease separation.
The increase in the liquid fraction with decreasing pressure between points C and D is exactly the opposite of the normal trend. This behavior, however, is typical of gas condensate systems. Retrograde conditions may be encountered in deep-well gas production, as well as in reservoir conditions.
The formation of liquid hydrocarbons in a gas reservoir as the pressure in the reservoir decreases below dewpoint pressure during production. It is called retrograde because some of the gas condenses into a liquid under isothermal conditions instead of expanding or vaporizing when pressure is decreased. See: condensate , reservoir pressure.
11 de oct. de 2023 · This article discusses phase behavior, pressure volume temperature (PVT) behavior, gas density and formation volume factor (FVF), viscosity, determining reservoir fluid properties, retrograde behavior, and equations of state (EOS).
Sometimes we see or hear the terms “Retrograde Condensate Reservoir” or “Retrograde Condensate System.” This terminology is used to describe reservoirs in which the isothermal reservoir pressure-temperature path traverses the retrograde region of the system’s phase envelope.
Retrograde conditions may be encountered in deep-well gas production, as well as in reservoir conditions. For production operations, usually the objective is to maintain pressure so as to achieve maximum liquid dropout.
In a gas-condensate reservoir, the initial reservoir condition is in the single-phase area to the right of the critical point. As reservoir pressure declines, the fluid passes through the dewpoint and a liquid phase drops out of the gas.
![5 Phase Diagram of a Typical Retrograde Gas Reservoir. [6] | Download ...](https://pe.images.search.yahoo.com/search/images?p=retrograde+gas+phase&nojs=1&ei=UTF-8&age=1d&fr=yhs-Elex-elex_22find&th=121&tw=153&imgurl=https%3A%2F%2Fwww.researchgate.net%2Fprofile%2FHadi_Parvizi%2Fpublication%2F303874049%2Ffigure%2Fdownload%2Ffig4%2FAS%3A371090711957504%401465486328149%2FPhase-Diagram-of-a-Typical-Retrograde-Gas-Reservoir-6.png&rurl=https%3A%2F%2Fwww.researchgate.net%2Ffigure%2FPhase-Diagram-of-a-Typical-Retrograde-Gas-Reservoir-6_fig4_303874049&size=73KB&name=5+Phase+Diagram+of+a+Typical+Retrograde+Gas+Reservoir.+%5B6%5D+%7C+Download+...&oid=3&h=565&w=713&turl=https%3A%2F%2Ftse1.mm.bing.net%2Fth%3Fid%3DOIP.Da_-3JnxswRTj45PDl79uQHaF3%26pid%3DApi%26rs%3D1%26c%3D1%26qlt%3D95%26w%3D153%26h%3D121&tt=5+Phase+Diagram+of+a+Typical+Retrograde+Gas+Reservoir.+%5B6%5D+%7C+Download+...&sigr=d0zAiNwlAfUt&sigit=ikga2nEO72tF&sigi=O3UHEyHEgXSa&sign=dAfkmOZehNmH&sigt=dAfkmOZehNmH "5 Phase Diagram of a Typical Retrograde Gas Reservoir. [6] | Download ...")
