The Use of Semicontinuous Description To Model the C7+ Fraction in Equation of State Calculations

Behrens, R.A.; Sandler, Stanley I.

doi:10.2118/14925-pa

Cited by 50 publications

(45 citation statements)

References 15 publications

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“…First, the residue or the heaviest (C 7 þ or higher) cut can be readily divided into discrete fractions by extending the distribution to molecular weights greater than that can be measured directly [16]. Another advantage is the definition of C 7 þ heavier into a series of pseudocomponents based on statistical reasoning and the model parameters used to describe molar distribution [17]. A continuous description can also be used directly in EOS [18][19][20][21][22].…”

Section: Fluid Characterizationmentioning

confidence: 99%

Application of Gaussian quadrature method to characterize heavy ends of hydrocarbon fluids for modeling wax precipitation

Tabatabaei-Nejad

Khodapanah

2011

Applied Mathematical Modelling

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a b s t r a c tThe hydrocarbon plus fractions that comprise a significant portion of naturally occurring hydrocarbon fluids create major problems when determining the thermodynamic properties and the volumetric behavior of these fluids by equations of state. These problems arise due to the difficulty of properly characterizing the plus fractions (heavy ends). Proper characterization of the heavier components is important when cubic equations of state and/or solid formation thermodynamic models are used to describe complex phase behavior of reservoir fluids. The effect of heavy fractions characterization on thermodynamic modeling of wax precipitation has been investigated using different models including Won, Pan and proposed models. In order to characterize the plus fraction (heavier part) as a series of pseudocomponents, a probability model that expresses the mole fraction as a continuous function of the molecular weight has been used. The study has been conducted using several mixtures. Two different SCN (single carbon number), C 7 þ and C 10 þ were chosen. The Chosen SCN were distributed to multi-components of five, six, and/or ten using continuous function and Gaussian quadrature method. The results showed that the fractioning is required to be able to predict wax precipitation. Distribution of C 10 þ using a proper distribution function has shown improvement in predictions of WAT and the amount of wax deposited in comparison with the characterization of C 7 þ using semi-continuous approach. In predicting of WAT and the amount of wax build up the developed model showed superiority over the others.

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Section: Fluid Characterizationmentioning

confidence: 99%

Application of Gaussian quadrature method to characterize heavy ends of hydrocarbon fluids for modeling wax precipitation

Tabatabaei-Nejad

Khodapanah

2011

Applied Mathematical Modelling

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“…Behrens and Sandler [16] suggested a method for fully describing the C 7+ fraction by two pseudo-components. Their method starts by calculating the exponential parameter α of the distribution function F(I ).…”

Section: Behrens and Sandler Lumpingmentioning

confidence: 99%

Comparative Study of the C7+ Characterization Methods: An Object-Oriented Approach

Naji

2011

Arab J Sci Eng

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When using equations of state (EOS) to predict the phase behavior of hydrocarbon mixtures, problems occur with the C 7+ fraction that exists in such mixtures. Minimizing such problems requires either fine-tuning the EOS and/or characterizing the C 7+ fraction. C 7+ characterization is the most important, yet most difficult step associated with the description of reservoir fluids. Several methods have been proposed for characterizing the C 7+ fraction. Collectively, these methods are grouped into two main categories: correlation and splitting and lumping. This paper revisits the most common characterization methods presented in the literature, which have received wide acceptance. In addition, a worthwhile contribution of this paper is the proposed improvement to the Katz constant-parameter splitting method. A further contribution is that the resulting program is coded in an object-oriented manner, which offers flexibility in programming and allows the different parts of the code to be described easily and in a natural manner as if they were real world objects.

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“…First, the residue or the heaviest (C 7+ or higher) cut can be readily divided into discrete fractions by extending the distribution to molecular weights greater than that can be measured directly (Whitson, 1983). Another advantage is the definition of C 7+ heavier into a series of pseudocomponents based on statistical reasoning and the model parameters used to describe molar distribution (Behrens and Sandler, 1986). A continuous description can also be used directly in EOS (Briano and Glandt, 1983;Cotterman, 1985;.…”

Section: Characterization Of Heavy Fractionmentioning

confidence: 99%

An investigation on the sensitivity analysis of the parameters of proposed wax precipitation model

Tabatabaei-Nejad

Khodapanah

2009

Journal of Petroleum Science and Engineering

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The Use of Semicontinuous Description To Model the C7+ Fraction in Equation of State Calculations

Cited by 50 publications

References 15 publications

Application of Gaussian quadrature method to characterize heavy ends of hydrocarbon fluids for modeling wax precipitation

Application of Gaussian quadrature method to characterize heavy ends of hydrocarbon fluids for modeling wax precipitation

Comparative Study of the C7+ Characterization Methods: An Object-Oriented Approach

An investigation on the sensitivity analysis of the parameters of proposed wax precipitation model

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