Influence of wettability and permeability heterogeneity on miscible CO2 flooding efficiency

Bikkina, Prem; Wan, Jiamin; Kim, Yongman; Kneafsey, Timothy J.; Tokunaga, Tetsu K.

doi:10.1016/j.fuel.2015.10.090

Cited by 105 publications

(43 citation statements)

References 30 publications

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“…Displacement of these immiscible fluid phases through complex pore networks results in some CO 2 becoming trapped as droplets and ganglia in pore spaces, referred to as residual trapping or capillary trapping [ Saadatpoor et al ., ; Krevor et al ., ]. The understanding of the mechanisms underlying capillary trapping is important not only for the predictions of storage capacity in GCS [ Saadatpoor et al ., ; Krevor et al ., ], but also for improving the efficiency of enhanced oil/gas recovery [ Bikkina et al ., ].…”

Section: Introductionmentioning

confidence: 99%

Wettability impact on supercritical CO₂ capillary trapping: Pore‐scale visualization and quantification

Wan

Kim

et al. 2017

Water Resources Research

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How the wettability of pore surfaces affects supercritical (sc) CO2 capillary trapping in geologic carbon sequestration (GCS) is not well understood, and available evidence appears inconsistent. Using a high‐pressure micromodel‐microscopy system with image analysis, we studied the impact of wettability on scCO2 capillary trapping during short‐term brine flooding (80 s, 8–667 pore volumes). Experiments on brine displacing scCO2 were conducted at 8.5 MPa and 45°C in water‐wet (static contact angle θ = 20° ± 8°) and intermediate‐wet (θ = 94° ± 13°) homogeneous micromodels under four different flow rates (capillary number Ca ranging from 9 × 10−6 to 8 × 10−4) with a total of eight conditions (four replicates for each). Brine invasion processes were recorded and statistical analysis was performed for over 2000 images of scCO2 saturations, and scCO2 cluster characteristics. The trapped scCO2 saturation under intermediate‐wet conditions is 15% higher than under water‐wet conditions under the slowest flow rate (Ca ∼ 9 × 10−6). Based on the visualization and scCO2 cluster analysis, we show that the scCO2 trapping process in our micromodels is governed by bypass trapping that is enhanced by the larger contact angle. Smaller contact angles enhance cooperative pore filling and widen brine fingers (or channels), leading to smaller volumes of scCO2 being bypassed. Increased flow rates suppress this wettability effect.

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Section: Introductionmentioning

confidence: 99%

Wettability impact on supercritical CO₂ capillary trapping: Pore‐scale visualization and quantification

Wan

Kim

et al. 2017

Water Resources Research

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“…Their analysis showed that oil recovery improvement was achieved by the reductions of oil viscosity and interfacial tension, and the increase of CO 2 solubility. In 2016, Bikkina et al [16] conducted a set of laboratory experiments to investigate the effect of reservoir wettability on the efficiency of CO 2 -EOR process. It was found that oil recovery was significantly higher in oil-wet core samples compared to water-wet ones.…”

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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Influence of wettability and permeability heterogeneity on miscible CO2 flooding efficiency

Cited by 105 publications

References 30 publications

Wettability impact on supercritical CO₂ capillary trapping: Pore‐scale visualization and quantification

Wettability impact on supercritical CO₂ capillary trapping: Pore‐scale visualization and quantification

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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Influence of wettability and permeability heterogeneity on miscible CO2 flooding efficiency

Cited by 105 publications

References 30 publications

Wettability impact on supercritical CO2 capillary trapping: Pore‐scale visualization and quantification

Wettability impact on supercritical CO2 capillary trapping: Pore‐scale visualization and quantification

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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Product

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Wettability impact on supercritical CO₂ capillary trapping: Pore‐scale visualization and quantification

Wettability impact on supercritical CO₂ capillary trapping: Pore‐scale visualization and quantification