Experimental study on oil recovery mechanism of CO2 associated enhancing oil recovery methods in low permeability reservoirs

Wei, Jiang; Zhou, Jiumu; Li, Jiangtao; Zhou, Xiaofeng; Dong, Wennan; Cheng, Ziyue

doi:10.1016/j.petrol.2020.108047

Cited by 28 publications

(16 citation statements)

References 32 publications

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“…Wang et al 30 simulated water injection, CO 2 injection, and WAG injection processes via a microscopic visualization device and observed and analyzed the multiphase flow characteristics and residual oil trapping mechanism. Wei et al 32 evaluated the oil displacement characteristics of CO 2 flooding, CO 2 alternating water flooding (WAG), and surfactant alternating CO 2 flooding (SAC) and clarified the CO 2 -assisted mechanism of enhanced oil recovery. It is found that SAC has the best oil displacement efficiency, which effectively improves the recovery facto.…”

Section: Research Methods For the Effect Of Co 2 Injection On Reservo...mentioning

confidence: 99%

A Minireview of the Influence of CO₂ Injection on the Pore Structure of Reservoir Rocks: Advances and Outlook

Gao

Xie²,

Cheng

et al. 2022

Energy Fuels

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The recoverable hydrocarbon reserves of conventional oil and gas resources are very limited in China. As important alternative resources, unconventional oil and gas have become a research hotspot. Though tight reservoirs have great potential to alleviate the increasing demand, issues during the development process, such as the rapid pressure depletion, fast decline in production, low productivity, and difficulties in water injection, are usually encountered due to poor physical properties like small pore throats and strong heterogeneity of the pore structure. The CO2 flooding technique could effectively replace crude oil from micro-nanopores, which is considered as a promising way to enhance the development performance of tight oil. However, precipitation and dissolution phenomena usually occur along with the CO2 injection process into reservoirs, affecting the pore structure evolution and oil displacement efficiency. In addition, artificial and natural fractures will even make this process more complicated. This paper presents the commonly used experimental approaches for CO2 injection into tight reservoirs and summarizes the main methods for investigating the influence of CO2 injection on the pore structure of reservoir rocks. Based on this, we highlighted that more attention should be paid to the influence of fractures and their dynamic changes on the evolution of pore structure during CO2 injection and the study of the solid–liquid interactions. To establish a method that could quantitatively evaluate the full-scale evolution of pore throats after CO2 injection is necessary. Meanwhile, the interaction strength of precipitation and dissolution and their effects on pore structure also remain open. Finally, a rigorous framework that could reveal the evolution mechanism and characterize the multiscale pore structure involving multiple influencing factors is urgently warranted.

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Section: Research Methods For the Effect Of Co 2 Injection On Reservo...mentioning

confidence: 99%

A Minireview of the Influence of CO₂ Injection on the Pore Structure of Reservoir Rocks: Advances and Outlook

Gao

Xie²,

Cheng

et al. 2022

Energy Fuels

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show abstract

“…Second, carbonic acid will be produced after mixing CO 2 with water, which will corrode rocks, such as limestone, and make the rock more fragile. 15,16 Ding et al 15 conducted experiments on rocks fractured by different fluids and found that initiation pressures of supercritical CO 2 , liquid CO 2 , and pure water were 8.8, 9.6, and 19.7 MPa, respectively. In addition, Song et al 17 also found that CO 2 fracturing can reduce the rock-breaking threshold pressure.…”

Section: Co 2 Fracturingmentioning

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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“…Currently, with the recovery of international oil prices and the gradual implementation of carbon peaking and carbon neutral targets, CO 2 gas drive enhanced oil recovery technology, which can achieve both effective CO 2 storage and enhanced recovery of oil and gas reservoirs, is highly favored. − Supercritical CO 2 in the oil and gas system has special physical and chemical properties. First, its density is close to liquid, viscosity is close to gas, and has strong solvation ability and high diffusion coefficient.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Driving Effect of the CO₂ Viscosity Enhancer Composite System in Extra-Low Permeability Sandstone Reservoirs

Dong

Wang

et al. 2023

ACS Omega

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CO2 flooding is an important technology to enhance oil recovery and realize effective storage of CO2 in ultra-low permeability reservoir. However, due to poor reservoir properties, strong interlayer heterogeneity, and unfavorable mobility ratio of CO2, gas channeling easily occurs, resulting in low recovery. Chemically assisted CO2 thickening technology has been developed to control the gas flow rate and improve the CO2 repulsion effect. Through solubility and viscosity enhancement tests, the CO2 viscosity enhancer composite system is preferably constructed and then combined with the core drive experiments, the effect of CO2 viscosity enhancer composite system on oil drive in homogeneous and non-homogeneous cores is evaluated, the correlation between the drive efficiency and viscosity enhancement and solubility of the system is analyzed, and the mechanism of recovery enhancement is explored. The results show that the preferably constructed CO2–ASA-LAP composite system has a good effect for improving the gas drive effect under simulated formation conditions, and its improvement effect is positively related to the solubility and viscosity increase of the system. Combining oil repelling efficiency and economic considerations, ASA:LAP = 1:1 is selected as the optimal CO2 viscosity enhancer composite oil repelling system. For homogeneous cores, the CO2–ASA-LAP combined system drive can increase the recovery rate by 6.65% as compared with CO2 flooding. For heterogeneous cores, when the permeability difference is 5, the comprehensive recovery factor of the CO2–ASA-LAP system flooding is 8.14% higher than that of CO2 flooding. When the permeability difference increases from 5 to 10, the comprehensive recovery factor of the CO2–ASA-LAP system flooding increases by 1.85%.The injection of the CO2–ASA-LAP system has some injurious effect on the permeability of the reservoir core, and the smaller the permeability, the greater the degree of injury. The mechanism of the CO2–ASA-LAP system to improve recovery includes increasing CO2 viscosity, improving the oil repelling flow ratio, blocking high seepage channels, initiating low seepage residual oil, enhancing CO2 dissolution, and expanding the oil repelling effect.

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Experimental study on oil recovery mechanism of CO2 associated enhancing oil recovery methods in low permeability reservoirs

Cited by 28 publications

References 32 publications

A Minireview of the Influence of CO₂ Injection on the Pore Structure of Reservoir Rocks: Advances and Outlook

A Minireview of the Influence of CO₂ Injection on the Pore Structure of Reservoir Rocks: Advances and Outlook

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

Evaluation of the Driving Effect of the CO₂ Viscosity Enhancer Composite System in Extra-Low Permeability Sandstone Reservoirs

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Experimental study on oil recovery mechanism of CO2 associated enhancing oil recovery methods in low permeability reservoirs

Cited by 28 publications

References 32 publications

A Minireview of the Influence of CO2 Injection on the Pore Structure of Reservoir Rocks: Advances and Outlook

A Minireview of the Influence of CO2 Injection on the Pore Structure of Reservoir Rocks: Advances and Outlook

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

Evaluation of the Driving Effect of the CO2 Viscosity Enhancer Composite System in Extra-Low Permeability Sandstone Reservoirs

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Product

Resources

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A Minireview of the Influence of CO₂ Injection on the Pore Structure of Reservoir Rocks: Advances and Outlook

A Minireview of the Influence of CO₂ Injection on the Pore Structure of Reservoir Rocks: Advances and Outlook

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

Evaluation of the Driving Effect of the CO₂ Viscosity Enhancer Composite System in Extra-Low Permeability Sandstone Reservoirs