Oil recovery mechanisms and asphaltene precipitation phenomenon in immiscible and miscible CO2 flooding processes

Cao, Meng; Gu, Yongan

doi:10.1016/j.fuel.2013.01.018

Cited by 205 publications

(122 citation statements)

References 25 publications

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“…The CO 2 flooding process, depending on the highest possible operating pressure and minimum miscible conditions, can be performed at both miscibility and immiscibility conditions (Wang and Gu 2011). The oil recovery mechanisms that occur in CO 2 injection include the oil viscosity reduction, light-component extraction, IFT reduction, immiscible and miscible displacements and improving the oil swelling (Cao 2012;Holm and Josendal 1974;Mungan 1981;Simon and Graue 1965). These mechanisms could play key roles, depending on whether the CO 2 displacement is miscible or immiscible.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of miscibility conditions of dead and live asphaltenic crude oil–CO2 systems

Golkari

Riazi

2016

J Petrol Explor Prod Technol

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Carbon dioxide (CO 2 ) injection is a well-established enhanced oil recovery method. The optimization process of CO 2 injection is usually performed through estimation of two physical properties, i.e., minimum miscibility and first-contact miscibility pressures (MMP and FCMP) for the crude oil-CO 2 system. In this experimental study, the equilibrium IFT of the crude oil-CO 2 system is measured at (313.15 and 323.15 K) for two oil types (i.e., live and dead crude oil) using the axisymmetric pendant drop shape analysis method. Vanishing interfacial tension technique is also applied to estimate the MMP and FCMP. The experimental results demonstrate that IFT decreases with different trends as the equilibrium pressure increases for the systems of live oil/CO 2 and dead oil/CO 2 systems.The IFT test results demonstrate that the estimated MMP and FCMP values of crude oil-CO 2 system increase with temperature. It was also observed that the presence of methane gas in the oil phase increases the MMP value, whereas it decreases the FCMP.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of miscibility conditions of dead and live asphaltenic crude oil–CO2 systems

Golkari

Riazi

2016

J Petrol Explor Prod Technol

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“…Lower injection rates can promote the occurrence of gravity segregation which is a result of large density difference between the less dense CO 2 gas and, significantly more dense oil. In the other words, increasing the CO 2 injection rate can reduce the tendency of gravity segregation of phases, as a larger oil bank is moving toward production wells, in addition, with higher injection rate of CO 2 , it would be easier to overcome the capillary forces in porous media [38,15]. Therefore, choosing a right injection rate is critical in any CO 2 flooding recovery process to avoid the gravity override problems.…”

Section: Co 2 Flooding Without Using Ultrasoundmentioning

confidence: 99%

“…They showed that recovery factor increases with increasing injection rate. In 2013, Cao and Gu [15] studied the mechanisms of oil recovery from immiscible CO 2 flooding process in core samples of tight sandstone reservoirs. They showed that oil recovery was improved as they increased injection pressure.…”

Section: Introductionmentioning

confidence: 99%

Ultrasound-assisted CO2 flooding to improve oil recovery

Hamidi

Haddad

Mohammadian

et al. 2017

Ultrasonics Sonochemistry

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CO 2 flooding process as a common enhanced oil recovery method may suffer from interface instability due to fingering and gravity override, therefore, in this study a method to improve the performance of CO 2 flooding through an integrated ultraosund-CO 2 flooding process is presented. Ultrasonic waves can deliver energy from a generator to oil and affect its properties such as internal energy and viscosity. Thus, a series of CO 2 flooding experiments in the presence of ultrasonic waves were performed for controlled and uncontrolled temperature conditions.Results indicate that oil recovery was improved by using ultrasound-assisted CO 2 flooding compared to conventional CO 2 flooding. However, the changes were more pronounced for uncontrolled temperature conditions of ultrasound-assisted CO 2 flooding. It was found that ultrasonic waves create a more stable interface between displacing and displaced fluids that could be due to the reductions in viscosity, capillary pressure and interfacial tension. In addition, higher CO 2 injection rates, increases the recovery factor in all the experiments which highlights the importance of injection rate as another factor on reduction of the fingering effects and improvement of the sweep efficiency.

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“…Under the double effects of heterogeneity and gravitational differentiation, water breakthrough in the lower high-permeability layers rapidly results in low sweep efficiency, poor oil recovery, and high water cut of production (Niu et al, 2006;Wen, 2012). After water flooding, oil recovery is usually about 40% to 50% of the original oil in place (OOIP) (Cao and Gu, 2013;Bikkina et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Numerical study of immiscible CO<SUB align="right">2 flooding in thick reservoirs with positive rhythm

Wang

Yang

Song

et al. 2017

PCFD

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Abstract:Benefitting from the development of carbon capture and storage (CCS) technology, CO 2 flooding for enhanced oil recovery (EOR) has become increasingly attractive to the petroleum industry. This paper presents a numerical study about the feasibility and efficiency of the immiscible CO 2 flooding process, which is a potential tertiary oil recovery method for use after water flooding, with advantages of lower cost and fewer facility requirements than miscible CO 2 flooding. A numerical simulation model established from laboratory experimental results was used to predict fluid behaviour and influence factors of immiscible CO 2 flooding in thick reservoirs with positive rhythm to enhance oil recovery after water flooding. Injection and confining pressure conditions are both important to the displacement process and results.

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Oil recovery mechanisms and asphaltene precipitation phenomenon in immiscible and miscible CO2 flooding processes

Cited by 205 publications

References 25 publications

Experimental investigation of miscibility conditions of dead and live asphaltenic crude oil–CO2 systems

Experimental investigation of miscibility conditions of dead and live asphaltenic crude oil–CO2 systems

Ultrasound-assisted CO2 flooding to improve oil recovery

Numerical study of immiscible CO<SUB align="right">2 flooding in thick reservoirs with positive rhythm

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