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• W4256357587 abstract "On IFT Measurements to Estimate Minimum Miscibility Pressures Kristian Jessen; Kristian Jessen U. of Southern California Search for other works by this author on: This Site Google Scholar Franklin M. Orr Franklin M. Orr Stanford University Search for other works by this author on: This Site Google Scholar Paper presented at the SPE Annual Technical Conference and Exhibition, Anaheim, California, U.S.A., November 2007. Paper Number: SPE-110725-MS https://doi.org/10.2118/110725-MS Published: November 11 2007 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Jessen, Kristian, and Franklin M. Orr. On IFT Measurements to Estimate Minimum Miscibility Pressures. Paper presented at the SPE Annual Technical Conference and Exhibition, Anaheim, California, U.S.A., November 2007. doi: https://doi.org/10.2118/110725-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE Annual Technical Conference and Exhibition Search Advanced Search AbstractMeasurements of the interfacial tension of mixtures of a reservoir fluid and injection gas at various pressures have been proposed as an experimental method for predicting the minimum miscibility pressure (MMP) in an experiment called the vanishing interfacial tension (VIT) technique. In this paper we analyze the accuracy and reliability of the VIT approach based on phase equilibrium and slimtube experimental observations and equation of state calculations of the behavior of VIT experiments for the same systems.We consider 13 gas-oil systems for which phase equilibrium and density data and slimtube measurements of the MMP are available. We show that tuned equation of state characterizations using 15-components to represent the gas/oil systems yield calculations of phase compositions and densities and calculated MMPs that reproduce accurately the experimental observations. We assume that IFTs can be calculated with a parachor expression, and we simulate the behavior of a series of VIT experiments with different mixture compositions in the VIT cell. We show that compositions of mixtures created in the VIT cell are not, in general, critical mixtures and that calculated estimates of the MMP obtained by the VIT approach depend strongly on the composition of the mixture used in the experiment. We show also that those MMP estimates may or may not differ significantly from values obtained in slimtube displacements. Fortuitously chosen mixture compositions can result in VIT estimates that agree well with slimtube MMPs, while for other mixtures, the error of the estimates can be quite large. In particular, we show that errors in the VIT estimate of the MMP are often large for gas/oil systems for which the first contact miscibility pressure is much larger than the slimtube MMP.We conclude, therefore, that the VIT experiment is not a reliable single source of information regarding development of multicontact miscibility in multicomponent gas/oil displacements.IntroductionMany oil fields are now candidates for enhanced oil recovery processes such as tertiary gas floods or miscible water alternating gas injection schemes. The MMP is an important parameter in the design and implementation of these displacement processes, and hence it is equally important that the MMP be determined by a method that is both reliable and accurate.Several methods have been proposed for measurement of the MMP. The slimtube displacement experiment is the most commonly used approach [1–3]. Due to the time consuming process of performing multiple slimtube displacement experiments, alternative experimental approaches have been proposed. Some investigators have suggested use of a rising bubble experiment, in which observations of bubbles of injection gas rising through oil [4–8], as a method for determining the MMP. Zhou and Orr [9] concluded that the changes in bubble behavior observed in the rising bubble experiment are primarily due to changes in interfacial tension (IFT) as components in the bubble dissolve in the oil and components in the oil transfer to the bubble. They showed that rising bubble experiments could be used to measure the MMP for vaporizing gas drives but are less accurate for condensing gas drives, while a drop of oil falling through gas could be used to determine the MMP for condensing gas drives. Whether either a falling drop or a rising bubble experiment could be used to determine the MMP accurately in condensing/vaporizing gas drives such as those described by Zick [10], Stalkup [11], and Johns et al. [12] has not been determined.Rao and coworkers [13–21] proposed a different use of IFT observations to determine the MMP. They measured IFTs for pendant drops of oil suspended in a cell containing a two-phase mixture of the injection gas and the oil. In that approach, known as the VIT experiment, the IFT is measured at a sequence of pressures, and the MMP is taken to be the pressure at which the IFT plotted as a function of pressure extrapolates to zero IFT. Orr and Jessen [22] presented an analysis of the VIT technique based on equation-of-state (EOS) calculations for well-characterized ternary and quaternary gas/oil systems and demonstrated that the VIT experiment may give estimates of the MMP that differ significantly from the MMP based on critical tie lines for condensing, vaporizing, and condensing/vaporizing gas drives. Keywords: vit estimate, minimum miscibility pressure, enhanced recovery, psia, Simulation, PVT measurement, IFT, calculation, experimental slimtube mmp, slimtube MMP Subjects: Fluid Characterization, Improved and Enhanced Recovery, Phase behavior and PVT measurements This content is only available via PDF. 2007. Society of Petroleum Engineers You can access this article if you purchase or spend a download." @default.
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• W4256357587 title "On IFT Measurements to Estimate Minimum Miscibility Pressures" @default.
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