Investigation of feasibility of alkali–cosolvent flooding in heavy oil reservoirs

Li, Yibo; Jia, He-Fei; Pu, Wanfen; Wei, Bing; Wang, Shuoshi; Yuan, Na

doi:10.1016/j.petsci.2022.12.001

Cited by 9 publications

(2 citation statements)

References 51 publications

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“…In the process of polymer flooding, the mechanism of mobility control, change of water absorption profile, and expansion of swept volume [22,23] can be seen. In the process of surfactant flooding [24,25] or alkali flooding [26,27], the mechanism of low interfacial tension, wettability change, and emulsified oil can be seen. At present, chemical methods can be used to improve oil recovery and expand the swept volume and improve oil-displacement efficiency.…”

Section: Introductionmentioning

confidence: 99%

Study on the Adaptability Evaluation of Micro-Dispersed-Gel-Strengthened-Alkali-Compound System and the Production Mechanism of Crude Oil

Wang,

Wu,

Liu

et al. 2024

Processes

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A novel micro-dispersed-gel (MDG)-strengthened-alkali-compound flooding system was proposed for enhanced oil recovery in high-water-cut mature oilfields. Micro-dispersed gel has different adaptability and application schemes with sodium carbonate and sodium hydroxide. The MDG-strengthened-alkali flooding system can reduce the interfacial tension to an ultra-low interfacial-tension level of 10−2 mN/m, which can reverse the wettability of rock surface. After 30 days aging, the MDG-strengthened-Na2CO3 flooding system has good viscosity retention of 74.5%, with an emulsion stability of 79.13%. The enhanced-oil-recovery ability of the MDG-strengthened-Na2CO3 (MDGSC) flooding system is 43.91%, which is slightly weaker than the 47.78% of the MDG-strengthened-NaOH (MDGSH) flooding system. The crude-oil-production mechanism of the two systems is different, but they all show excellent performance in enhanced oil recovery. The MDGSC flooding system mainly regulates and seals micro-fractures, forcing subsequent injected water to enter the low-permeability area, and it has the ability to wash the remaining oil in micro-fractures. The MDGSH flooding system mainly removes the remaining oil on the rock wall surface in the micro-fractures by efficient washing, and the MDG particles can also form weak plugging of the micro-fractures. The MDG-strengthened-alkali flooding system can be used as an alternative to enhance oil recovery in high-water-cut and highly heterogeneous mature oilfields.

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Section: Introductionmentioning

confidence: 99%

Study on the Adaptability Evaluation of Micro-Dispersed-Gel-Strengthened-Alkali-Compound System and the Production Mechanism of Crude Oil

Wang,

Wu,

Liu

et al. 2024

Processes

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“…This characteristic makes thermal recovery technology the most direct and effective method for heavy oil development. Presently, the mainstream heavy oil thermal recovery technologies worldwide include steam flooding (Wang et al, 2015), cyclic steam stimulation (Yang et al, 2016), combustion oil in-situ (Zhang et al, 2013;Li et al, 2022), steamassisted gravity drainage (SAGD) (Wei et al, 2022), microwave oil recovery, etc (Li et al, 2023a).…”

Section: Introductionmentioning

confidence: 99%

Experimental study on flue gas foam-assisted steam flooding: investigating characteristics of enhanced oil recovery and gas storage

Cao,

Wei,

et al. 2023

Front. Energy Res.

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Steam flooding is one of the most widely used heavy oil thermal recovery technologies. Steam transfers heat to heavy oil to reduce viscosity and improve fluidity. The current problem is that steam loses a lot of heat in the formation, and there are serious carbon emissions in the whole production process. In this paper, flue gas and steam were combined to drive heavy oil in the form of composite thermal fluid, and foam was added on this basis. With the help of one-dimensional sandpack model, both single-model and parallel dual-model with permeability ratio experiments were conducted to investigate key characteristics such as steam heat transfer, heavy oil production and flue gas retention during the displacement process. The experimental results indicated that flue gas effectively inhibited steam condensation and reduced heat loss during the flow process. Compared to steam flooding, the sandpack model exhibited temperature rises of 4.4°C and 9.1°C at the middle and end, respectively. While flue gas foam fell slightly short of flue gas in terms of enhanced heat transfer, it outperforms in recovery factor, achieving a 10.4% improvement over flue gas-assisted steam flooding. The foam blocked gas channeling by accumulating and capturing along the flow path, resulting in a gas retention volume of 389 mL within the model. Furthermore, the flue gas foam facilitated steam flow to previously unswept low-permeability areas, thus enhancing oil recovery. In the parallel double-model experiment, the low-permeability model exhibited significantly improved oil displacement efficiency compared to flue gas-assisted steam flooding, and the remaining oil content in the end of the high permeability model was increased by 1.9%, while the remaining oil content in the front and end of the low-permeability model was reduced by 3.5% and 3.8% respectively.

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Dual-responsive emulsion system: Unraveling pH and host-guest interactions for emulsion stability and enhanced oil recovery

Jiang,

Wang,

Yan

et al. 2024

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Investigation of feasibility of alkali–cosolvent flooding in heavy oil reservoirs

Cited by 9 publications

References 51 publications

Study on the Adaptability Evaluation of Micro-Dispersed-Gel-Strengthened-Alkali-Compound System and the Production Mechanism of Crude Oil

Study on the Adaptability Evaluation of Micro-Dispersed-Gel-Strengthened-Alkali-Compound System and the Production Mechanism of Crude Oil

Experimental study on flue gas foam-assisted steam flooding: investigating characteristics of enhanced oil recovery and gas storage

Dual-responsive emulsion system: Unraveling pH and host-guest interactions for emulsion stability and enhanced oil recovery

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