An efficient correlation for calculating compressibility factor of natural gases

Azizi, Navid; Behbahani, Reza Mosayebi; Isazadeh, M.A.

doi:10.1016/s1003-9953(09)60081-5

Cited by 79 publications

(53 citation statements)

References 1 publication

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“…9). While Sanjari and Lay (2012) and Azizi et al (2010) show marked deviations from the unit line, Heidaryan et al (2010) and Eqs. 14 and 16 fall on the unit line.…”

Section: Linearized Z-factor Isothermsmentioning

confidence: 99%

“…One of the best explicit correlations for evaluation of the z-factor was given by Beggs and Brills (1973). More recent ones are Heidaryan et al (2010), Azizi et al (2010) and Sanjari and Lay (2012) correlations. A short description of some of the explicit correlations is presented in the following subsections.…”

Section: Explicit Correlationsmentioning

confidence: 99%

“…3). Azizi et al (2010) presented an explicit correlation with 20 constants for a reduced temperature range of 1:1 T pr 2 and reduced pressure range of 0:2 P pr 11. The correlation used 3038 data points within the given ranges.…”

Section: Explicit Correlationsmentioning

confidence: 99%

“…Plots of the z-factors generated using the three most recent explicit correlations (Sanjari and Lay 2012;Heidaryan et al 2010;Azizi et al 2010) were compared with those generated using Eqs. 14 and 16 (Fig.…”

Section: Linearized Z-factor Isothermsmentioning

confidence: 99%

See 3 more Smart Citations

New explicit correlation for the compressibility factor of natural gas: linearized z-factor isotherms

Kareem

Iwalewa

Al-Marhoun³

2015

J Petrol Explor Prod Technol

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The compressibility factor (z-factor) of gases is a thermodynamic property used to account for the deviation of real gas behavior from that of an ideal gas. Correlations based on the equation of state are often implicit, because they require iteration and are computationally expensive. A number of explicit correlations have been derived to enhance simplicity; however, no single explicit correlation has been developed for the full range of pseudoreduced temperatures 1:05 T pr 3 À Á and pseudo-reduced pressures 0:2 P pr 15 À Á , which represents a significant research gap. This work presents a new z-factor correlation that can be expressed in linear form. On the basis of Hall and Yarborough's implicit correlation, we developed the new correlation from 5346 experimental data points extracted from 5940 data points published in the SPE natural gas reservoir engineering textbook and created a linear z-factor chart for a full range of pseudo-reduced temperatures ð1:15 T pr 3Þ and pseudo-reduced pressures ð0:2 P pr 15Þ.

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“…9). While Sanjari and Lay (2012) and Azizi et al (2010) show marked deviations from the unit line, Heidaryan et al (2010) and Eqs. 14 and 16 fall on the unit line.…”

Section: Linearized Z-factor Isothermsmentioning

confidence: 99%

Section: Explicit Correlationsmentioning

confidence: 99%

Section: Explicit Correlationsmentioning

confidence: 99%

Section: Linearized Z-factor Isothermsmentioning

confidence: 99%

See 2 more Smart Citations

New explicit correlation for the compressibility factor of natural gas: linearized z-factor isotherms

Kareem

Iwalewa

Al-Marhoun³

2015

J Petrol Explor Prod Technol

View full text Add to dashboard Cite

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“…Papp Correlation (Najim, 1995), Shell Oil Company Correlation (Kumar, 2004) and Beggs and Brill Correlation (Beggs and Brill, 1973) are direct relations and Hall-Yarborough Correlation (Yarborough and Hall, 1974), Dranchuk and Abou-Kassem Correlation (Dranchuk and Abou-Kassem, 1975) are iterative relations for calculating compressibility factor of natural gas. New correlation for compressibility factor of natural gas has been presented by and Azizi et al (2010). correlation has 1.660 of average absolute percent deviation (AAPD) versus Standing and Katz (1942) chart.…”

Section: Introductionmentioning

confidence: 99%

Developing novel correlations for calculating natural gas thermodynamic properties

Farzaneh–Gord¹,

Rahbari²

2011

Chemical and Process Engineering

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Natural gas is a mixture of 21 components and it is widely used in industries and homes. Knowledge of its thermodynamic properties is essential for designing appropriate processes and equipment. This paper presents simple but precise correlations of how to compute important thermodynamic properties of natural gas. As measuring natural gas composition is costly and may not be effective for real time process, the correlations are developed based on measurable real time properties. The real time properties are temperature, pressure and specific gravity of the natural gas. Calculations with these correlations are compared with measured values. The validations show that the average absolute percent deviation (AAPD) for compressibility factor calculations is 0.674%, for density is 2.55%, for Joule-Thomson coefficient is 4.16%. Furthermore, in this work, new correlations are presented for computing thermal properties of natural gas such as enthalpy, internal energy and entropy. Due to the lack of experimental data for these properties, the validation is done for pure methane. The validation shows that AAPD is 1.31%, 1.56% and 0.4% for enthalpy, internal energy and entropy respectively. The comparisons show that the correlations could predict natural gas properties with an error that is acceptable for most engineering applications.

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The Small Effect of Poroelastic Pressure Transients on Triggering of Production‐Induced Earthquakes in the Groningen Natural Gas Field

Postma

2018

JGR Solid Earth

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Over the past decade, a steep increase in the number of seismic events has been observed in the Groningen gas field, the Netherlands. It is generally accepted that these are induced by compaction of the reservoir rock due to extensive depletion, causing a buildup of strain energy in faults that may be released seismically. We address the possible triggering of fault slip by the transient pressure field surrounding a well that has undergone a sudden rate change. Assuming a unilateral decoupling between displacement and pressure, numerical experiments are conducted using a sequential finite volume‐finite element solution strategy that fully incorporates second‐order terms in the radial flow equation. We investigate an idealized Groningen‐like geometry to discover whether the hypothesized possibility of triggering‐induced seismicity exists, explore how some controllable and uncontrollable variables influence its severity, and possibly provide clues on how production strategy might be able to avoid its occurrence. The results demonstrate that sudden production changes can indeed trigger near‐well seismic events, but that the effect is very small compared to other potential causes. Changing from sudden to gradual changes in well rates is therefore not expected to lead to a significant reduction in the number or magnitude of production‐induced earthquakes in the Groningen field.

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An efficient correlation for calculating compressibility factor of natural gases

Cited by 79 publications

References 1 publication

New explicit correlation for the compressibility factor of natural gas: linearized z-factor isotherms

New explicit correlation for the compressibility factor of natural gas: linearized z-factor isotherms

Developing novel correlations for calculating natural gas thermodynamic properties

The Small Effect of Poroelastic Pressure Transients on Triggering of Production‐Induced Earthquakes in the Groningen Natural Gas Field

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