SPE Annual Technical Conference and Exhibition 2003
DOI: 10.2118/84092-ms
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Analyzing Reservoir Fluid Composition In-Situ in Real Time: Case Study in a Carbonate Reservoir

Abstract: TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractNear-infrared (NIR) spectroscopy is used to provide in-situ quantitative characterization of reservoir fluids during wireline sampling using five representative composition groupings (C 1 , C 2 -C 5 , C 6+ , CO 2 , and water). This information is vital for the proper execution of wireline fluid sampling jobs. Time variances of fluid compositions, along with absolute compositions, give us important clues about the phase and contamination level of the capturing… Show more

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Cited by 10 publications
(6 citation statements)
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“…Moreoever, miscible flood can cause asphaltene precipitation. Measurement of "colorless" black oil is such an example (Fujisawa et al 2003). When separator gas is used for pressure maintenance and sweep, different hydrocarbon phases can be produced.…”
Section: Asphaltene Nanoaggregate Clusteringmentioning
confidence: 99%
“…Moreoever, miscible flood can cause asphaltene precipitation. Measurement of "colorless" black oil is such an example (Fujisawa et al 2003). When separator gas is used for pressure maintenance and sweep, different hydrocarbon phases can be produced.…”
Section: Asphaltene Nanoaggregate Clusteringmentioning
confidence: 99%
“…The OD response clearly indicates a small asphaltene gradient. A few OD points deviating from this trend can be explained based on asphaltene equilibrium and gas charging (Fujisawa et al 2003). The GOR and fluorescence responses complement one another indicating that there is a GOR variation; but it does not follow any particular trend, except for showing fluid segregation.…”
Section: Data Analysis and Resultsmentioning
confidence: 90%
“…According to the Beer-Lambert rule, optical density, x(), is defined as the logarithm of the reciprocal of T(), the light transmittance at a given wavelength , and is a linear function of concentration, k , optical path length, l, and absorption coefficient, ␣ k of a compound (Kristensen et al 2014;Indo et al 2013;Fujisawa et al 2003). Also the composite optical density can be approximately described by a linear combination of optical density of individual compounds as follows (Kristensen et al 2014) and is given in Eq.…”
Section: Dfa Theory: Compositional Analysis and Gor Estimatesmentioning
confidence: 99%
“…A-4,  denotes the wavelength of the electro-magnetic wave, in particular the wavelength of the UV-visible-NIR light, passing through the sample. Although Beer-Lambert's law is derived for dilute systems, this equation is a good approximation for condensed systems such as high pressure gas and crude oils (Fujisawa et al 2003). In the absence of chemical interations, the optical density of multi-component systems can be described as a linear combination of the absorbances of the individual components (e.g.…”
Section: A-1: Fluid Identificationmentioning
confidence: 99%
“…Furthermore, the ratio of the methane and oil peaks may be related to the gas-oil ratio (GOR) of the crude oil being sampled (Mullins 2001;Dong 2002Dong , 2006. Detailed analysis of optical spectra in the vicinity of the hydrocarbon and carbon dioxide peaks has allowed estimates to be made of the concentration of the lighter components of petroleum fluids: first in terms of thye pseudo-components C 1 , C 2-5 , C 6+ and CO 2 (Fujisawa et al 2003) and, later, in terms of C 1 , C 2 , C 3-5 , C 6+ and CO 2 Fujisawa et al 2007). Improved estimates of GOR have resulted from combining these estimated compositions with the methods of artificial neural networks (ANN), (Hegeman et al 2009).…”
Section: Introductionmentioning
confidence: 99%