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A New Method for Estimating Compressibility Factors of Natural Gases Based on Bender Equation of State

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Proceedings of the International Field Exploration and Development Conference 2021 (IFEDC 2021)

Abstract

It is highly significant to determine precisely and rapidly the compressibility factor (Z-factor) of natural gases, a commonly used parameter in many engineering calculations concerning oil and gas reservoir development, such as material balance analysis, estimation of oil/gas in place, gas flow theory, numerical reservoir simulation, pipeline design and so on. A new Z-factor correlation, based on the Bender E (1970) equation of state and corresponding state principle, is developed in this paper, and then a new method for estimating gas compressibility factors continuously is proposed with the nonlinear regression analysis technique. The calculated results of DPR, HY, DAK correlations, commonly used in oil and gas reservoir engineering at present, are compared with those of the new method presented here, using standard data of Z-factor modified by the paper. The results of comparative analysis, based on isotherm error statistics and error distribution maps, show that the new method boasts a wider scope of application and a smoother error distribution. For the standard data points of Z-factor within the general pressure-temperature range (i.e., 0.2 ≤ ppr ≤ 15 & 1.05 ≤ Tpr ≤ 3.0) and relatively high-temperature & high-pressure range (i.e., 15 ≤ ppr ≤ 30 & 1.4 ≤ Tpr ≤ 2.8), its average absolute error (AAE) is 0.305% and 0.065% respectively, distinctly superior to the above three methods. Those approaches for determining gas compressibility factors based on correlations avoid the shortcomings of experimental measurements and type curves which are inefficient, time-consuming, and incapable of continuous estimations. Thus, the new method is recommended to determine Z-factor. The pseudo-critical parameters (i.e., ppc & Tpc) should be corrected beforehand in the presence of non-negligible non-hydrocarbon impurities in the gas mixture. The new method for calculating gas compressibility factors based on Bender (1970) equation of state can estimate the Z value quickly, accurately, and continuously under various pressure and temperature conditions through a simple iteration procedure, helpful to provide valuable reference for relevant engineering applications by virtue of its desirable calculation accuracy.

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Acknowledgments

The project is supported by the National Science and Technology Major Project of China (Grant No. 2016ZX05015002 & 2017ZX05030003). The authors of the paper would like to express heartfelt gratitude to the Department of Middle East E&P and Department of Asia-Pacific E&P, Research Institute of Petroleum Exploration and Development (RIPED), PetroChina.

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Zhang, Lx. et al. (2022). A New Method for Estimating Compressibility Factors of Natural Gases Based on Bender Equation of State. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2021. IFEDC 2021. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-19-2149-0_196

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