Thermal properties of petroleum products/

Cragoe, C. S.

doi:10.6028/nbs.mp.97

Cited by 31 publications

(13 citation statements)

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“…MW corr = 1.425027 3 10   MW 3 -0.1222435 MW 2 +4.447774 MW-31.60120 …………………………….. (8) Now the next step is how to split the corrected MW in Equation 8 to a relevant reference (direct flash to standard conditions) CGR's. CGR is a natural outcome of a separation process that intrinsically satisfies a mass balance equation and this is well covered in the petroleum engineering literature.…”

Section: Fluid Typementioning

confidence: 99%

Development of a Correlation for the Estimation of Condensate to Gas Ratio CGR and Other Key Gas Properties From Density/Molecular Weight

Dindoruk

2012

SPE Annual Technical Conference and Exhibition

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Condensate to Gas Ratio (CGR) is a measure of liquid content of a naturally occurring hydrocarbon mixture that is classified as gas condensate at reservoir conditions. It is also one of the most important parameters that impacts the economics of gas projects. In many cases, especially in the case of stranded gas, significant project value will be drawn from the liquid content of the gas. There are number of difficulties in measuring the CGR of a gas stream in the laboratory, or sometimes simply the value may not be known. Some of the difficulties in lab processes (but not limited to) originate from:1. Non-equilibrium flash and carry-over 2. Amount of the fluid used (volume constraints and errors) In this paper, we have developed a simple easy to use semi-empirical correlation that accurately estimates the CGR of a gas condensate system using fluid densities (or molecular weights). Fluid densities can be obtained either from gradient measurements or directly from the laboratory measurements. To our knowledge, there is no equivalent correlation published in literature. The proposed correlation can be used for: a) Exploration support to estimate the CGR ranges (valid up to CGR = 350 STB/MMSCF). b) Form a yard-stick to quality-check laboratory experiments. c) Generate necessary input parameters for other key gas properties: such as Z-factor, gas formation volume factor, Molecular weight, gas viscosity and even compositions. d) Reconciliation of contaminated samples against the measured or estimated fluid densities.

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Section: Fluid Typementioning

confidence: 99%

Development of a Correlation for the Estimation of Condensate to Gas Ratio CGR and Other Key Gas Properties From Density/Molecular Weight

Dindoruk

2012

SPE Annual Technical Conference and Exhibition

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“…Reservoir gas-in-place = 2.08 MMCF per acre of rock volume Some of the parameters (for example the molecular weight) in the above procedure can be calculated from various available equations. One such equation is by Cragoe (1929):…”

Section: Solutionmentioning

confidence: 99%

Calculation of hydrocarbon-in-place in gas and gas-condensate reservoirs - Carbon dioxide sequestration

Verma¹

2012

Open-File Report

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“…(2) is the basis of the correlation developed by such authors as Cragoe (3) , Kesler-Lee (4) and Standing (5) .…”

Section: Theoretical Frameworkmentioning

confidence: 99%

Improved Characterization of Heptanes-Plus Fractions of Light Crudes

Isehunwa

Falade

2007

All Days

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractHeptanes plus fractions have strong effects on the physical properties and phase behaviour of petroleum fluids. It is therefore very important to properly characterize plus fractions. A step to achieving improved characterization is to obtain more realistic molecular weights. Most of the current methods of heptanes plus characterization assume their molecular weights are accurate. However, what is commonly measured in the laboratory is the molecular weight of the complete fluid; the molecular weight of the heptaneplus fraction is then estimated using Kay's mixing rule. Unfortunately, physical properties like molecular weight obtained using 'equivalent fluid' principles by mixing pure components, do not give the same values with actual measurements. Therefore, while a very accurate estimate of the molecular weight of a reservoir oil could be available, that of the heavy fractions, which is 'inferred' could be unreliable, because of the mixing rule.It is concluded that the proposed technique perhaps provides a theoretical basis for the usual 'tuning' of heptane-plus properties during fluid modelling. It is also concluded that a more accurate correlation for estimating the molecular weight of light crudes has been developed.

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Thermal properties of petroleum products/

Cited by 31 publications

References 0 publications

Development of a Correlation for the Estimation of Condensate to Gas Ratio CGR and Other Key Gas Properties From Density/Molecular Weight

Development of a Correlation for the Estimation of Condensate to Gas Ratio CGR and Other Key Gas Properties From Density/Molecular Weight

Calculation of hydrocarbon-in-place in gas and gas-condensate reservoirs - Carbon dioxide sequestration

Improved Characterization of Heptanes-Plus Fractions of Light Crudes

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