Key parameters and dominant EOR mechanism of CO2 miscible flooding applied in low-permeability oil reservoirs

Wang, Tengfei; Wang, Liangliang; Meng, Xingbang; Chen, Yi; Song, Wei; Yuan, Chengdong

doi:10.1016/j.geoen.2023.211724

Cited by 21 publications

(12 citation statements)

References 42 publications

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“…We consider a 1-D study of the three-phase, oil-water-gas flow similar to that in a slimtube experiment [18,[36][37][38]40,41]. The domain x ∈ [0, L] is filled with a uniform porous medium of a given porosity ϕ and permeability k (Figure 1).…”

Section: Overviewmentioning

confidence: 99%

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Monte Carlo Simulation of the CO2 Flooding Efficiency at a Core Scale for Different Oil Compositions

Andreeva,

Afanasyev

2024

Energies

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The evaluation of water-alternating-gas (WAG) efficiency and profitability is complicated by a large number of reservoir, operating, and economic parameters and constraints. This study aims at understanding the influence of the oil composition on different WAG injections. By employing compositional reservoir modeling and the Monte Carlo method to characterize the diversity of oils occurring in nature, we simulate the microscopic displacement efficiency of CO2 flooding when it is applied to both light- and heavy-oil reservoirs. We find that the economic performance of WAG in both miscible and immiscible scenarios is mainly characterized by the dimensionless injection rate and the oil density at surface conditions. Neither the bubble point pressure nor the minimum miscibility pressure can be used for the quantification of the optimal WAG parameters. We present our estimates of the best strategies for the miscible and immiscible injections and verify some of our previous results for randomly sampled oils. In particular, we demonstrate that CO2 flooding is better to apply at higher-dimensionless injection rates. We show that the injection of CO2 organized at a light-oil reservoir results in a higher profitability of WAG, although this comes at the cost of lower carbon storage efficiency.

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Section: Overviewmentioning

confidence: 99%

“…It is generally desirable to implement miscible CO 2 flooding, i.e., at a reservoir pressure larger than MMP, rather than immiscible flooding. The compositional modeling is widely employed to estimate E d , E v , and E a [16,28,29,33,34], whereas E d can also be evaluated in the slim-tube experiments [35][36][37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Monte Carlo Simulation of the CO2 Flooding Efficiency at a Core Scale for Different Oil Compositions

Andreeva,

Afanasyev

2024

Energies

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“…Crude oil expands and internal kinetic energy increases after CO 2 is absorbed, which provides energy to improve exploitation effectiveness. ,, Meanwhile, its flow capacity is improved, because its flow resistance is reduced. The water-plugging effect is overcome by crude oil expansion. , In addition, crude oil will also expand because of the absorption of CO 2 in small fractures and pores. This causes crude oil to be squeezed out of pores and fractures, thereby increasing crude oil recovery. , CO 2 is released to provide energy with continuous exploitation.…”

Section: Co2 Floodingmentioning

confidence: 99%

“…The water-plugging effect is overcome by crude oil expansion. 49,67 In addition, crude oil will also expand because of the absorption of CO 2 in small fractures and pores. This causes crude oil to be squeezed out of pores and fractures, thereby increasing crude oil recovery.…”

Section: Change Oil−water Viscosity and Crude Oil Densitymentioning

confidence: 99%

Application and Research Progress of CO₂ Stimulation Technology in Unconventional Oil and Gas Reservoirs: A Review and Prospect

Fu,

Shao,

Shao

et al. 2023

Energy Fuels

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“…Due to gas is easy to flow, expand volume, reduce oil viscosity and interfacial tension, CO 2 flooding shows significant advantages in solving the development of low permeability reservoir, which could supplement formation energy and effectively control water [14][15]. Wang et al [16] indicated that CO 2 miscible flooding is advisable for lowpermeability reservoir. CO 2 has excellent oil displacement ability in low-permeability reservoirs, especially miscible flooding, and the core oil saturation is decreased obviously.…”

Section: Introductionmentioning

confidence: 99%

Integrated CO2 Miscible Flooding-Storage Technologies for Complex Fault Block Reservoirs with Low Permeability

Yu¹,

Sun²,

Tang³

et al. 2023

Preprint

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During the production process of complex fault block reservoirs with low permeability, the systematic research on the combination of oil displacement and storage is fuzzy. This work aims at oil displacement and storage to supplement formation energy and evaluate storage potential. Firstly, the optimal development scheme is designed by layer division and miscible and ability. Secondly, based on large amounts of field data, the novel FAHP evaluation system for CO2 storage site selection is established. Thirdly, since judging adaptability evaluation is suitable, the carbon storage simulation is conducted to contain mineralization, dissolved and structural mechanisms. The results indicate that after 1.2HCPV CO 2 injected cumulatively into reservoir, the cumulative oil increase reached 4001.80×10 4 m 3 and the final recovery rate was 44.46%, achieving a good effect. At the stage of injection, the CO2 capacity remaining in the reservoir was nearly 1657.53×10 4 t and the gas storage rate reached 43.84%. The novel evaluation system for CO 2 storage site selection shows that the target reservoir has more storage space, large injection capacity, high safety factor and low storage cost, which is allowed to storage. At the stage of storage, the effective storage capacity of target reservoir was 2257.48×10 4 t, of which the structural storage capacity was 73.43% and the mineral storage capacity was the least (3.46%). The average annual CO 2 storage capacity is about 225.74×10 4 t, which is equivalent to planting 2031.69×10 4 t trees or shutting down 135.69×10 4 cars for one year, achieving oil displacement/storage synergetic optimization. The findings of this study can offer engineers guidance for ensuring the long-term, stable and safe operation of CO 2 storage. For complex fault block reservoirs with low permeability "green, low-carbon, efficient" development has a certain reference.

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Key parameters and dominant EOR mechanism of CO2 miscible flooding applied in low-permeability oil reservoirs

Cited by 21 publications

References 42 publications

Monte Carlo Simulation of the CO2 Flooding Efficiency at a Core Scale for Different Oil Compositions

Monte Carlo Simulation of the CO2 Flooding Efficiency at a Core Scale for Different Oil Compositions

Application and Research Progress of CO₂ Stimulation Technology in Unconventional Oil and Gas Reservoirs: A Review and Prospect

Integrated CO2 Miscible Flooding-Storage Technologies for Complex Fault Block Reservoirs with Low Permeability

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Key parameters and dominant EOR mechanism of CO2 miscible flooding applied in low-permeability oil reservoirs

Cited by 21 publications

References 42 publications

Monte Carlo Simulation of the CO2 Flooding Efficiency at a Core Scale for Different Oil Compositions

Monte Carlo Simulation of the CO2 Flooding Efficiency at a Core Scale for Different Oil Compositions

Application and Research Progress of CO2 Stimulation Technology in Unconventional Oil and Gas Reservoirs: A Review and Prospect

Integrated CO2 Miscible Flooding-Storage Technologies for Complex Fault Block Reservoirs with Low Permeability

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Product

Resources

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Application and Research Progress of CO₂ Stimulation Technology in Unconventional Oil and Gas Reservoirs: A Review and Prospect