Analysis on PVT test and empirical formula of Bohai heavy oil with different types of dissolved gases
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Analysis on PVT test and empirical formula of Bohai heavy oil with different types of dissolved gases Yigang Liu1 · Yingzhong Yuan2 · Fayuan Zhou1 · Zhilin Qi2 · Wei Zhang1 · Hua Zhang1 · Qiuxia Wang1 Received: 28 May 2020 / Accepted: 4 August 2020 © The Author(s) 2020
Abstract Accurate prediction of PVT properties of heavy oil system is of great significance to the design of injection–production parameters and dynamic analysis of multi-thermal fluid stimulation in heavy oil reservoir. The saturation pressure and viscosity of Bohai heavy oil system at different temperature and different gas oil ratio conditions were tested and analyzed. The functional relations of regression equations for saturation pressure and viscosity are constructed based on classical PVT correlations, but the parameters in the equations different from classical correlations are obtained from present experiment test data with multiple regression method. The empirical formula analysis results indicate that the 2-parameter equation can almost completely fit the experimental data, but its application scope is narrow. Although the 4-parameter equation has an extensive adaptability, its fitting accuracy is very low. The 3-parameter equation can not only better fit the saturation pressure and viscosity of heavy oil for the same gas under different dissolved gas oil ratios and different temperatures, but also has a wide application range. It is recommended to use the 3-parameter equation for physical property analysis and calculation of heavy oil. The research results provide a basis for the accurate prediction of heavy oil PVT parameters. Keywords Heavy oil · Dissolved gas oil ratio · Saturation pressure · Viscosity · Empirical formula
Introduction The heavy oil reservoirs have wide distributions in the world. It is very difficult to develop the heavy oil reservoirs because of extra high viscosity. The horizontal well multithermal fluid stimulation technology is an important way to enhance heavy oil production rate and recovery, especially for the offshore heavy oil reservoir influenced by the factors including limited platform space, economic benefit, environment pollution and operation security (Dong et al. 2014, 2016; Ge et al. 2019; Liu et al. 2020). This technology can effectively increase the production rate of heavy oil by huff and puff or displacement with multi-thermal fluid (Liu et al. 2010; Sun et al. 2011; Hou et al. 2016). Heating and dissolving to reduce viscosity, aquathermal cracking reaction, increasing swept volume, developing hot fluid * Yingzhong Yuan [email protected] 1
CNOOC Tianjin Branch, Tianjin 300459, China
Chongqing Key Laboratory of Complex Oil and Gas Fields Exploration and Development, Chongqing University of Science and Technology, Chongqing 401331, China
2
chamber, forming non-miscible displacement, reducing heat loss and maintaining pressure are the important mechanisms of enhancing oil recovery by multi-thermal fluids (Liu et al. 2012; Huang et al. 2018; Wa
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