Enhanced oil recovery by air-foam flooding system in tight oil reservoirs: Study on the profile-controlling mechanisms

Liu, Pengcheng; Zhang, Xiaokun; Wu, Yongbin; Li, Xiuluan

doi:10.1016/j.petrol.2016.12.001

Cited by 86 publications

(30 citation statements)

References 40 publications

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“…In this study, the increment of oil recovery is 2.1% considering both molecular diffusion and adsorption, 2.7% lower than the case only including the molecular diffusion. (3) Results indicate that molecular diffusion and adsorption will decrease the cumulative CO 2 backflow in the simulation of CO 2 -EOR process. For this typical reservoir, the cumulative CO 2 backflow decreases to 59%.…”

Section: Discussionmentioning

confidence: 94%

Simulation Study of CO2 Huff-n-Puff in Tight Oil Reservoirs Considering Molecular Diffusion and Adsorption

Zhang

2019

Energies

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CO2 injection has great potentials to improve the oil production for the fractured tight oil reservoirs. However, Current works mainly focus on its operation processes; full examination of CO2 molecular diffusion and adsorption was still limited in the petroleum industry. To fill this gap, we proposed an efficient method to accurately and comprehensively evaluate the efficiency of CO2-EOR process. We first calculated the confined fluid properties with the nanopore effects. Subsequently, a reservoir simulation model was built based on the experiment test of the Eagle Ford core sample. History matching was performed for the model validation. After that, we examined the effects of adsorption and molecular diffusion on the multi-well production with CO2 injection. Results illustrate that in the CO2-EOR process, the molecular diffusion has a positive impact on the oil production, while adsorption negatively impacts the well production, indicating that the mechanisms should be reasonably incorporated in the simulation analysis. Additionally, simulation results show that the mechanisms of molecular diffusion and adsorption make great contributions to the capacity of CO2 storage in tight formations. This study provides a strong basis to reasonably forecast the long-term production during CO2 Huff-n-Puff process.

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Section: Discussionmentioning

confidence: 94%

Simulation Study of CO2 Huff-n-Puff in Tight Oil Reservoirs Considering Molecular Diffusion and Adsorption

Zhang

2019

Energies

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“…In high permeability group (numbers 1-3), the EOR rate of target foam flooding was nearly equivalent to ASP flooding, but significantly better than normal foam flooding. Commonly, blocking effect has a weak impact on the EOR rate in high permeability conditions [29], therefore, normal foam system performed a weak EOR effect. However, as the liquid phase had high EOR capacity (having ultra-low oil-liquid IFT), the target foam system showed better EOR rate than other two controlling group.…”

Section: Optimization Of Foam System Performancementioning

confidence: 99%

Ultra-Low Interfacial Tension Foam System for Enhanced Oil Recovery

Liu

Luo

et al. 2019

Applied Sciences

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The liquid phase of foam systems plays a major role in improving the fluidity of oil, by reducing oil viscosity and stripping oil from rock surfaces during foam-flooding processes. Improving the oil displacement capacity of the foam’s liquid phase could lead to significant improvement in foam-flooding effects. Oil-liquid interfacial tension (IFT) is an important indicator of the oil displacement capacity of a liquid. In this study, several surfactants were used as foaming agents, and polymers were used as foam stabilizers. Foaming was induced using a Waring blender stirring method. Foam with an oil-liquid IFT of less than 10–3 mN/m was prepared after a series of adjustments to the liquid composition. This study verified the possibility of a foam system with both an ultra-low oil-liquid IFT and high foaming properties. Our results provide insight into a means of optimizing foam fluids for enhanced oil recovery.

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“…As a key unconventional energy, tight oil has received increased attention by many scholars and has gradually become another research topic following shale gas [1]. The commercial exploitation of tight oil has greatly affected the energy structure of the world, especially North America [2,3]. A tight oil reservoir is characterized by low permeability (<0.1 mD), low porosity (<10%), and micro/nano pores.…”

Section: Introductionmentioning

confidence: 99%

The Characteristics of Oil Migration due to Water Imbibition in Tight Oil Reservoirs

et al. 2019

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In tight oil reservoirs, water imbibition is the key mechanism to improve oil production during shut-in operations. However, the complex microstructure and composition of minerals complicate the interpretation of oil migration during water imbibition. In this study, nuclear magnetic resonance (NMR) T2 spectra was used to monitor the oil migration dynamics in tight oil reservoirs. The factors influencing pore size distribution, micro-fractures, and clay minerals were systematically investigated. The results show that the small pores corresponded to a larger capillary pressure and a stronger imbibition capacity, expelling the oil into the large pores. The small pores had a more effective oil recovery than the large pores. As the soaking time increases, the water preferentially entered the natural micro-fractures, expelling the oil in the micro-fractures. Subsequently, the oil in the small pores was slowly expelled. Compared with the matrix pores, natural micro-fractures had a smaller flow resistance and were more conducive to water and oil flow. Clay minerals may have induced micro-fracture propagation, which can act as the oil migration channels during water imbibition. In contrary to the inhibitory effect of natural micro-fractures, the new micro-fractures could contribute to the oil migration from small pores into large pores. This study characterized the oil migration characteristics and provides new insight into tight oil production.

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Enhanced oil recovery by air-foam flooding system in tight oil reservoirs: Study on the profile-controlling mechanisms

Cited by 86 publications

References 40 publications

Simulation Study of CO2 Huff-n-Puff in Tight Oil Reservoirs Considering Molecular Diffusion and Adsorption

Simulation Study of CO2 Huff-n-Puff in Tight Oil Reservoirs Considering Molecular Diffusion and Adsorption

Ultra-Low Interfacial Tension Foam System for Enhanced Oil Recovery

The Characteristics of Oil Migration due to Water Imbibition in Tight Oil Reservoirs

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