Phase equilibria of the CO2–Jiangsu crude oil system and precipitation of heavy components induced by supercritical CO2

Liu, Z.M.; Yang, Guanying; Lu, Youcai; Han, Buxing; Yan, Haike

doi:10.1016/s0896-8446(99)00018-2

Cited by 35 publications

(17 citation statements)

References 5 publications

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“…Moreover, as reported by many papers [6][7][8][9]15], CO2 solubility in crude oil normally increases with increasing pressure but decreases with increasing temperature. The pressure sensitivity of the CO2 solubility at high pressures depends on the phase of CO2: when CO2 is in the liquid phase, the solubility is least sensitive to pressure [4,7].…”

Section: Introductionmentioning

confidence: 72%

Rheology and Phase Behavior of Carbon Dioxide and Crude Oil Mixtures

Crawshaw

Trusler

et al. 2016

Energy Fuels

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KEYWORDSRheology, phase behavior, heavy crude oil, carbon dioxide, viscosity, non-Newtonian fluid ABSTRACTThe rheology of Zuata heavy crude oil, saturated with carbon dioxide, was studied at a temperature of 50 °C and pressures up to 220 bar. Observations of phase behavior were also reported and used to interpret the rheological data. The crude oil is very viscous and non-Newtonian at ambient pressure, but when brought into equilibrium with CO2 the non-Newtonian behavior was weakened and eventually disappeared at high CO2 pressures. When diluted with 10 wt% and 30 wt% toluene, the diluted crude oils and their mixtures with CO2 behaved as Newtonian fluids. The CO2 saturated mixture of the crude oil samples showed an exponential decrease in viscosity with increasing CO2 pressure, but an increase in viscosity at higher pressures. Observing through a view cell, the CO2 dissolution caused a swelling effect on the original crude. When saturated with CO2, the swelling effect also occurred on the 10 wt% diluted crude oil, but the volume of the oil rich phase was 2 decreased at higher pressures. However, for the 30 wt% diluted crude oil, a second liquid phase was observed on top of the oil rich phase, at pressures higher than the CO2 critical point. The mixture viscosity was inversely proportional to the CO2 solubility.

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Section: Introductionmentioning

confidence: 72%

Rheology and Phase Behavior of Carbon Dioxide and Crude Oil Mixtures

Crawshaw

Trusler

et al. 2016

Energy Fuels

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“…From the results presented in Table 6, we find that the SAFT‐VR equation provides good accuracy in handling the C 7+ crude oil fractions, and performs better than either the PNA or the SCN method by Riazi and Vera 75. If we consider the Jiangsu crude oils,74 which represent an even heavier crude oil fraction, the SAFT‐VR equation gives an excellent description of the solubility of carbon dioxide in the crude oil for both temperatures (328.15 and 348.15 K) studied and for pressures up to 16 MPa, as shown in Figure 8. Unlike the solubilities of gases in the Exxon crude oils at low pressures, carbon dioxide tends to reach saturation concentrations on a molar basis in the Jiangsu crude oils at higher pressures.…”

Section: Resultsmentioning

confidence: 93%

“…Finally, we have also applied our SAFT‐VR equation with semi‐continuous thermodynamics to the calculation of gas solubility in crude oils. Specifically, we have studied the Exxon and Jiangsu crudes reported in the work of Schwarz and Prausnitz73 and Liu et al,74 respectively. The specifications of the Exxon and Jiangsu crude oils (C 7+ fractions) are given in Table 5, along with details of the two pseudo‐components used to describe the C 7+ fractions.…”

Section: Resultsmentioning

confidence: 99%

Predicting the phase equilibria of petroleum fluids with the SAFT‐VR approach

2007

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The SAFT‐VR equation of state is combined with a semi‐continuous thermodynamic approach to model several synthetic and crude oil systems. In our approach, the oil fractions are defined by a continuous distribution that is then represented as discrete pseudo‐components using the Gaussian quadrature method. The SAFT‐VR parameters for the pseudo‐components are obtained from simple linear relationships that were defined in earlier work, which allows the approach to be easily applied to undefined oil systems. Good agreement between the theoretical predictions and experimental data is obtained for bubble point pressure calculations of several gas condensates and the solubility of gases such as methane, ethane, and carbon dioxide in several crude oils. © 2007 American Institute of Chemical Engineers AIChE J, 2007

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“…Additionally, raising the gas injection volume in the CO 2 flooding process can also bring the corresponding increase of oil recovery (Baljit et al, 2001). But all of these measures to improve the CO 2 extraction capacity and oil recovery of CO 2 flooding may also change the composition of the residual oil and increase its further production difficulties, and sometimes even result in asphaltene precipitation and a consequent reduction in reservoir permeability and oil recovery (Yang et al, 2009;Liu et al, 1999). Yang et al (2009) researched the CO 2 extraction effects on viscosity and composition of three different oils under a constant pressure and found out that the extraction could affect residual oil viscosity and composition, but the pressure and gas injection volume effects on extraction and oil properties were not considered.…”

Section: Introductionmentioning

confidence: 99%

Extraction and Its Effects on Crude Oil Properties During CO₂Flooding

Ding

Yue

Zhao

et al. 2013

Energy Sources, Part A: Recovery, Utilization, and Environmenta

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In this article, using the high-temperature and high-pressure pressure, volume, and temperature experimental equipment to simulate the CO 2 extraction process of the crude oil, the effects of pressure and gas injection volume on extraction, and the extraction effects on oil properties were studied by measuring the CO 2 volume extraction ratio as well as the composition and viscosity of the oil. The experimental results show that the CO 2 extraction ratio increases with the increase of the pressure and the CO 2 can enhance the oil recovery by 59.3% through the extraction under the pressure of 46 MPa. At the same pressure, the CO 2 extraction ratio is 5-10 times as large as that of the hydrocarbon gas. The heavy component content and viscosity of both extracted oil and residual oil after the extraction increase as the pressure increases, meanwhile the extracted oil viscosity is smaller than that of the original oil, and the residual oil viscosity can reach 10 times as large as that of the original oil. Within the experiments, as the CO 2 injection volume increases, the extraction ratio of the oil increases slightly, and the composition and viscosity of the extracted oil remains basically unchanged, but the heavy component content and viscosity of the residual oil increase greatly. The viscosity can reach 8.3 times as large as that of the original oil. Thus, it can be seen that when the CO 2 injection volume is bigger than that of the oil, the increase of it has a very limited effect on the extraction ratio, but can make the residual oil viscosity increase greatly.

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Phase equilibria of the CO2–Jiangsu crude oil system and precipitation of heavy components induced by supercritical CO2

Cited by 35 publications

References 5 publications

Rheology and Phase Behavior of Carbon Dioxide and Crude Oil Mixtures

Rheology and Phase Behavior of Carbon Dioxide and Crude Oil Mixtures

Predicting the phase equilibria of petroleum fluids with the SAFT‐VR approach

Extraction and Its Effects on Crude Oil Properties During CO₂Flooding

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Phase equilibria of the CO2–Jiangsu crude oil system and precipitation of heavy components induced by supercritical CO2

Cited by 35 publications

References 5 publications

Rheology and Phase Behavior of Carbon Dioxide and Crude Oil Mixtures

Rheology and Phase Behavior of Carbon Dioxide and Crude Oil Mixtures

Predicting the phase equilibria of petroleum fluids with the SAFT‐VR approach

Extraction and Its Effects on Crude Oil Properties During CO2Flooding

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Product

Resources

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Extraction and Its Effects on Crude Oil Properties During CO₂Flooding