Fluids flow behaviors of nitrogen and foam-assisted nitrogen floods in 2D visual fault-karst carbonate reservoir physical models

Liang, Tuo; Hou, Jirui

doi:10.1016/j.petrol.2020.108286

Cited by 18 publications

(13 citation statements)

References 22 publications

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“…As a result, most attic oil is recovered with the release of pressure. Additionally, compared to the FOI in Figure 7, the GOI always keeps horizontal, corresponding to the discoveries in two-dimensional fracture-vuggy models [29,30,37]. Figure 8d shows a stable OWI and a significant decrease in the GOI with the N 2 cap further expansion.…”

Section: Foam-assisted N2 On Mobilizing Residual Oil Formed From Water Floodingmentioning

confidence: 57%

“…The GOI height decline rate (0.018 mm/s) is lower than that of the OWI (steep stage, 0.028 mm/s) due to the different distances between their fracture-vuggy structures and the injection well TK467. The closer the distance, the greater the downward driven force, resulting in a fast decline rate [29,30]. The OWI decline rate (gentle stage, 0.008 mm/s) is lower than that of the GOI (0.018 mm/s), which results from the different connectivity between their fracture-vuggy structures and around structures.…”

Section: Foam-assisted N2 On Mobilizing Residual Oil Formed From Water Floodingmentioning

confidence: 97%

“…The FOI away from the injection well is higher than that close to the injection well. The N 2 with a lower flow resistance can evenly accumulate in the top of the fracture-vuggy unit, while the N 2 foam with a higher migration resistance preferentially accumulates in the top of the fracture-vuggy unit close to the injection well [29,30]. With the foam injection, the N 2 foam accumulates in the whole top of the vug, generating a downward-driven force.…”

Section: Synergistic Effects Of Foam-assisted N 2 and Bottom Water On Interface Evolutionmentioning

confidence: 99%

“…The foam-polymer flooding method was also proposed to significantly enhance oil recovery in reservoirs [28]. Recent years, the foam-assisted N 2 flooding method, a combination of foam and nitrogen gas flooding, has attracted considerable attention to increase crude oil production [29,30]. Foam with low mobility can virtually plug the high permeable channel [31,32].…”

Section: Introductionmentioning

confidence: 99%

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Study on Fluid Behaviors of Foam-Assisted Nitrogen Flooding on a Three-Dimensional Visualized Fracture–Vuggy Model

Liang

Hou

2021

Applied Sciences

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Tahe Oilfield, located in northwest China, is an unconventional fracture–vuggy carbonate reservoir. The foam-assisted nitrogen gas flooding technology has been proven to be a potential EOR technology. However, the flow behaviors of foam-assisted nitrogen gas in fracture–vuggy structures are not clear due to the complex fracture–vuggy structures and their strong heterogeneity. In this work, a three-dimensional visualized fracture–vuggy model is designed and fabricated to investigate the fluids behaviors of foam-assisted N2 flooding and classify the residual oil types after foam-assisted N2 flooding. Experimental results reveal that foam slug can enlarge the sweep efficiency, suppress the formation of nitrogen gas channeling, and detach the oil film. Additionally, the evolution processes of the gas–oil and oil–water interfaces are investigated and analyzed. Moreover, the residual oil types after foam-assisted N2 flooding and nitrogen gas flooding, respectively, are classified and summarized. Compared to nitrogen gas flooding after water flooding, 12.36% more oil can be recovered through foam-assisted N2 flooding. This work further studies the fluid flow behaviors of foam-assisted N2 in the three-dimensional visualized fracture–vuggy carbonate model and also confirms the previous achievements.

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Section: Foam-assisted N2 On Mobilizing Residual Oil Formed From Water Floodingmentioning

confidence: 57%

Section: Foam-assisted N2 On Mobilizing Residual Oil Formed From Water Floodingmentioning

confidence: 97%

Section: Synergistic Effects Of Foam-assisted N 2 and Bottom Water On Interface Evolutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Study on Fluid Behaviors of Foam-Assisted Nitrogen Flooding on a Three-Dimensional Visualized Fracture–Vuggy Model

Liang

Hou

2021

Applied Sciences

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“…4 Besides, systematical experiments on nitrogen and foam ow behaviors in macro visual models have been analyzed and reported. 1,[15][16][17] These macro-visual models are designed and fabricated based on the similarity criterion. In this work, four types of micro-visual fracture-vuggy models are designed and fabricated based on the SEM images of outcrop cores obtained from Tahe oileld to observe and reveal the ow behaviors of uids.…”

Section: Introductionmentioning

confidence: 99%