Method of Improved Parameters for PR-EOS in CO2-crude Oil System

doi:10.11885/j.issn.1674-5086.2019.08.16.01

Abstract

Abstract: For imperfect CO₂-crude oil system at high temperature and high pressure, the existing state equation cannot give consideration to the requirement of accuracy and simplicity of calculation simultaneously. In order to obtain practical state equation for CO₂-crude oil system, influence factors such as temperature, pressure and the interaction of non-hydrocarbons components have been taken into account, Based on the principle of thermodynamics and flash calculation, parameters of PR EOS have been corrected, and the dimensionless coefficient has been changed from previous constant coefficient to function item which is associated with reduced temperature, thus prediction for density of liquid and characteristics of heavy components have been improved. Based on the data of components measured on site, the calculation accuracy of oil and gas components before and after PR EOS correction have been compared under condition of reservoir temperature and pressure. The results show that without sacrificing the simplicity of calculation, the new state equation has been improved significantly with calculation accuracy, and relative error of parameter has been reduced to less than 5%, which meets the requirements of engineering application and has better practical value in simulating and predicting fluid phase states under reservoir conditions and provides support for numerical simulation of CO₂ flooding.

Key words: CO₂-crude oil system, PR EOS, corrected EOS, flash calculation, reduced temperature

CLC Number:

TE319

XIE Dan, QU Liming, CHI Jianping, TAO Wulong, XIONG Weili. Method of Improved Parameters for PR-EOS in CO₂-crude Oil System[J]. 西南石油大学学报(自然科学版), 2020, 42(4): 127-134.

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Method of Improved Parameters for PR-EOS in CO₂-crude Oil System

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