New Approach to PVT Correlation Selection

Khabibullin, Rinat; Хасанов, М. К.; Brusilovsky, A.I.; Odegov, A.; Serebryakova, Darya; Krasnov, Vitaly

doi:10.2118/171241-ms

All Days 2014

DOI: 10.2118/171241-ms

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New Approach to PVT Correlation Selection

Rinat Khabibullin

М. К. Хасанов

A.I. Brusilovsky

et al.

Abstract: This paper attempts to provide engineer with GOR PVT correlation selection rules. Rules based on comparison of standard PVT correlations with calculations based on Equation of State, which believed to have wider applicability range and be more general from physical point of view.To make that comparison synthetic oils data bank where generated. Ranges for synthetic oils properties were chosen to cover all the real oils of interest (mainly from Western Siberia). All synthetic oils where analyzed using Peng Robin… Show more

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Cited by 6 publications

References 13 publications

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Analysis of Black Oil Correlations for PVT Properties Estimation

et al. 2015

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Over the last 30 years, considerable research into the assessment of PVT-properties of hydrocarbon formation has been carried out. Based on laboratorial and field research of oil and gas samples, two basic approaches of PVT-properties assessment were developed. They are correlation approaches, based on statistical analysis of the result of research and compositional simulation approach based on the equation of state (EOS) solution. These approaches have both advantages and disadvantages. It is clear that both of them are essentially dependent on the quality of the initial data obtained from the analysis of reservoir and surface samples of hydrocarbons. Therefore, it would be wrong to contrast two approaches in terms of priority. Compositional simulation is indispensable for the assessing of reservoir system behavior near the critical point for volatile oil and gas condensate systems, which have no correlation models, or give results with poor accuracy. The basis of compositional simulation is the composition of the formation system, which consists of individual components to C6 inclusively, and fractions of C7+ pseudocomponents. Correlation models are successfully used in assessing of the behavior of black oil. Basic parameters of PVT model correlation are Rsb - gas-oil ratio at bubble point, γo - oil specific density, γg - gas specific density, Pb - bubble point pressure, Tres - reservoir temperature. It should be noted these parameters can be obtained in different experiments of degassing, namely, single or differential, as well as within the framework of standard or commercial separation. Moreover, each PVT correlation usually tuned to its own regional data bank. As a result, different correlations may use different statistics on overlapping intervals. Recently, several articles have been published, which analyzed the correlation approaches of PVT properties assessment [1-3]. However, the study provides an analysis of correlations without recommendations for their use. The main conclusion of these studies is a statement of fact that the choice of correlations should be conducted with respect to basic oil properties. Usually, it recommends to use new coefficients for the standard correlation model.

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Analysis of Black Oil Correlations for PVT Properties Estimation

et al. 2015

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Analysis of Black Oil Correlations for PVT Properties Estimation (Russian)

Odegov

Khabibullin

Хасанов

et al. 2015

SPE Russian Petroleum Technology Conference

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Calculation Algorithm for Oil PVT-Properties

Serebryakova

2016

All Days

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This paper describes a new algorithm for calculating oil PVT-properties and associated petroleum gas. The technique was created to increase the accuracy of the standard "Black Oil" model. The method proposed is based on new correlation dependencies, material balance and correlation dependencies published by other authors in the past. To obtain new correlations, new compositional simulator (written in Visual Basic) and synthetic-oils were used. Bank of synthetic-oils covers a range of the PVT properties of real-oils (mainly Russian oil fields). Synthetic-oils are assumed to include only hydrocarbon components. Oil and gas PVT-properties at different temperature and pressure conditions were obtained by calculation using Peng-Robinson equation of state with shift parameter. Then correlations for properties at pressure below bubble-point pressure conditions have been created. New correlations were tested on real oils from Data Bank (certain from Russian fields). For this comparative calculations have been carried out. Calculations based on the new correlations were compared with calculations based on compositional models. Resulting correlations were found applicable. Resulting correlations may be used for calculations with the proposed method as well as independently as an alternative to other existing calculate correlations. In general, for the calculations using the method concerned, parameters the only required are the same as for the model Black Oil: the density of oil and gas in standard conditions, the initial gas-oil ratio, temperature and pressure. Since the calculations with the approach developed are based on simple mathematical equations with use of minimum of input parameters and they don't require special software, the technique involved can be easily applied in making engineering decisions.

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New Approach to PVT Correlation Selection

Cited by 6 publications

References 13 publications

Analysis of Black Oil Correlations for PVT Properties Estimation

Analysis of Black Oil Correlations for PVT Properties Estimation

Analysis of Black Oil Correlations for PVT Properties Estimation (Russian)

Calculation Algorithm for Oil PVT-Properties

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