Gas–oil non-equilibrium in multicontact miscible displacements within homogeneous porous media

Al-Wahaibi, Yahya; Muggeridge, Ann; Grattoni, Carlos A.

doi:10.1016/j.petrol.2009.06.004

Cited by 16 publications

(5 citation statements)

References 17 publications

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“…[36][37][38] In vertically upward displacements, since oil is displaced by a lesser density fluid CO 2 (Table I) at a low injection rate, gravity can suppress the viscous finger. 39 When the migration velocities of the mixing front and the CO 2 front are the same, the displacement is stabilized by gravity (see Figure 5 in Sec. III B).…”

Section: Resultsmentioning

confidence: 99%

Magnetic resonance imaging analysis on the in-situ mixing zone of CO2 miscible displacement flows in porous media

Song

Yang

Wang

et al. 2014

Journal of Applied Physics

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Experimental investigations of heterogeneous effect on supercritical pressure CO 2 and water flow in sintered porous media AIP Conf.The in-situ mixing zone represents dynamic characteristics of CO 2 miscible displacement flows, which is important for carbon dioxide enhanced oil recovery (CO 2 -EOR) projects. However, the migration characteristics of the in-situ mixing zone under reservoir conditions has been neither well studied nor fully understood. The in-situ mixing zone with the flowing mixture of supercritical CO 2 and n-decane (nC 10 ) was investigated by using a magnetic resonance imaging apparatus at a reservoir condition of 8.5 MPa and 37.8 C in porous media. The experimental results showed that the CO 2 -frontal velocity was larger than the mixing-frontal velocity. The mixing zone length was linearly declined in the miscible displacement process. And the declining rate of the mixing zone length was increased with injection rate. It indicates that the mixing zone length is not constant in a vertically stable CO 2 misible displacement and a volume contraction due to phase behavior effects may occur. Then, an error function based on the convection-dispersion equation was fitted with CO 2 miscible displacement experiments. The error function was well fitted both at a series of fixed core positions and a series of fixed displacement times. Furthermore, the longitudinal dispersion coefficients (K lx and K lt ) and the longitudinal Peclet numbers (Pe d and Pe L ) were quantified from the fitting results. The evolutions of the longitudinal dispersion coefficient were reduced along the displacement time. And the declining rate was increased with injection rate. And with proceeding, the longitudinal dispersion coefficient was tending towards stability and constant. But the evolutions of the longitudinal Peclet numbers were increased along the displacement time. And the increasing rate was increased with injection rate. V C 2014 AIP Publishing LLC.

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Section: Resultsmentioning

confidence: 99%

Magnetic resonance imaging analysis on the in-situ mixing zone of CO2 miscible displacement flows in porous media

Song

Yang

Wang

et al. 2014

Journal of Applied Physics

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“…The lighter fluid of CO 2 flows upward to drive the oil. The gravity effects of the oil inhibit the fingering of CO 2 ; − then, the gravity-stable displacement , is formed. This means that the viscous difference cannot result in fingering in the homogeneous cores under the gravity effect, as shown in Figure (a)–(c).…”

Section: Results and Discussionmentioning

confidence: 99%

Effects of Pore Structures on Seepage and Dispersion Characteristics during CO₂ Miscible Displacements in Unconsolidated Cores

et al. 2021

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In the challenge of decarbonization, an economical option for carbon capture, utilization, and storage is carbon dioxide enhanced oil recovery (CO2-EOR) and sequestration in depleted oil reservoirs. During the CO2-EOR processes, pore structures have significant effects on miscible flow performance. The permeability and heterogeneity are investigated by magnetic resonance imaging for seepage characteristics in this study. Furthermore, the dispersion coefficient and Peclet number are calculated by the error function for dispersion characteristics. The whole displacements are relatively stable with piston-like fronts in homogeneous cores while quite unstable with fingering fronts in heterogeneous cores. The results exhibited that the mixing zone length, mixing zone velocity, recovery factor, dispersion coefficient, and Peclet number are significantly affected by heterogeneity but less affected by permeability in the miscible displacement process. This indicates that the seepage and dispersion are more affected by the heterogeneity rather than the permeability. Heterogeneity is a more important parameter than permeability. To further investigate the micromechanism of supercritical CO2 miscible flows, the Lattice-Boltzmann method (LBM) is also used for local pore-space simulation, and the results showed that the fronts in local space are stable. The oil saturation results of the LBM simulation and BZ-04 experiment are closed at the A–B stage before the breakthrough time, and LBM is a good method for dealing with the microflow in miscible displacement. Therefore, more insight should be focused on heterogeneity rather than permeability. It is important to determine an effective parameter to represent heterogeneity in the future. Our study could support the application of oil recovery engineering.

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“…The transparent Perspex material used has excellent optical properties, permitting visualization of fluid movement within the models. This material is commonly used in flooding experiments for the convenience of visualizing the flooding process. − …”

Section: Methodsmentioning

confidence: 99%

Experimental Investigation of Factors Influencing Remaining Oil Distribution under Water Flooding in a 2-D Visualized Cross-Section Model

2021

ACS Omega

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About 70% of the remaining oil remains underground after water flooding, and there is a need to better understand the formation and distribution of this remaining macroscopic oil to enhance oil recovery. In this study, three types of visual plate models were devised with different packing sequences: homogeneous (J), high-permeability layer on top (F), and low-permeability layer on top (Z). Based on these models, several visual flooding experiments were conducted to study the water flooding physics and the remaining oil distribution pattern of an offshore thick heavy oil reservoir under the impact of formation heterogeneity, packing sequence, model length, and permeability contrast during water flooding. These displacements were monitored photographically, and the effluent production profiles were recorded. The results showed that layer permeability and gravitational segregation play an important role during the water flooding process in layered porous media. Experimental results based on the model with different lengths show that the breakthrough oil recovery decreases with the increase of well spacing. Finally, a correction was made to the gravity number by introducing a scaling factor that characterized the formation heterogeneity and packing sequence in thick formation, compared to a known gravity number; the modified gravity number showed a better correlation with breakthrough oil recovery of water and polymer flooding. The research results provide effective guidance for the remaining oil distribution and injection and production parameter optimization in actual reservoirs.

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Gas–oil non-equilibrium in multicontact miscible displacements within homogeneous porous media

Cited by 16 publications

References 17 publications

Magnetic resonance imaging analysis on the in-situ mixing zone of CO2 miscible displacement flows in porous media

Magnetic resonance imaging analysis on the in-situ mixing zone of CO2 miscible displacement flows in porous media

Effects of Pore Structures on Seepage and Dispersion Characteristics during CO₂ Miscible Displacements in Unconsolidated Cores

Experimental Investigation of Factors Influencing Remaining Oil Distribution under Water Flooding in a 2-D Visualized Cross-Section Model

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Gas–oil non-equilibrium in multicontact miscible displacements within homogeneous porous media

Cited by 16 publications

References 17 publications

Magnetic resonance imaging analysis on the in-situ mixing zone of CO2 miscible displacement flows in porous media

Magnetic resonance imaging analysis on the in-situ mixing zone of CO2 miscible displacement flows in porous media

Effects of Pore Structures on Seepage and Dispersion Characteristics during CO2 Miscible Displacements in Unconsolidated Cores

Experimental Investigation of Factors Influencing Remaining Oil Distribution under Water Flooding in a 2-D Visualized Cross-Section Model

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Effects of Pore Structures on Seepage and Dispersion Characteristics during CO₂ Miscible Displacements in Unconsolidated Cores