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• W2608365003 abstract "Due to concerns about global climate change, carbon dioxide gases from natural and industrial sources are more and more re-injected into depleted gas reservoirs. The PVT laboratory at Texas Tech University has undertaken a comprehensive study on compressibility factor (Z-factor) of hydrocarbon (HC) gas at various amount of CO2. For the sole purpose of the measured Z-factor data, three temperatures of 100°F, 160°F and 220°F and pressures ranges from 50 psia to 5000 psia are selected as representative of the depleted gas reservoirs (DGRs). In order to analyze the various phase behavior to be encountered in gas reservoirs (dry gas, wet gas and retrograde gas), the median gas compositions for dry, wet and retrograde gases are specified by gas type. The gas types are categorized by representative compositional analysis for the three types of gas reservoirs (dry gas, wet gas and retrograde gas). The measurements of z-factors for CO2-hydrocarbon mixtures in varying proportions and at the three specified temperatures for various pressures are performed on the median gas compositions of the type gases. The results of the Z-factor measurements of CO2-hydrocarbon mixtures are used to interpret the expected phase behavior to be encountered in the geologic storage of CO2 in gas reservoirs. Also, the Z-factor measurements of CO2-retrograde gas mixtures are used to quality the benefits of enhanced gas and condensate recovery in gas reservoirs. Introduction Carbon dioxide (CO2) gas has been used for enhanced oil recovery through miscible and immiscible displacement of oil at high pressures and moderate temperatures since the earlier 1970. Recently, research is being directed for the use of carbon dioxide in the oil refining through supercritical extraction of hydrocarbons. Current activities are to find ways for geologic storage of CO2 in oil or gas reservoirs. Although one laboratory measurement of CO2-hydrocarbon mixture in the limited ranges of temperatures and pressures used in this project has been reported in Venezuela (Rojas-Requena, 1992), this paper presents experimental measurements of Z-factors for CO2-hydrocarbon mixtures at three specified temperatures and pressures ranging from 50 psia to 5000 psia. The results of the experimental Z-factors are used to quantify economic benefits (such as enhanced oil recovery (EOR) and enhanced condensate vaporization) of geologic storage of CO2 in gas reservoir. Procedure for Z-factor Determination The compressibility factor, or Z-factor, is determined by manipulating the Real Gas Law and assuming that reservoir gas will behaves as an ideal gas at ambient pressure and temperature (McCain, 1990, page 106). The Real Gas Law is defined as follows: ZnRT PV = (1) For a constant composition system, the product of pressure and volume is constant, thus" @default.
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• W2608365003 date "2004-12-01" @default.
• W2608365003 modified "2023-09-24" @default.
• W2608365003 title "Measurement of Z-factors for carbon dioxide sequestration" @default.
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