Quantitative distinction of thermodynamic soluble and miscible states

Zhang, Kaiqiang; Jia, Na; Liu, Lirong

doi:10.1002/aic.16977

Cited by 3 publications

(2 citation statements)

References 45 publications

(49 reference statements)

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“…Among numerous enhanced oil recovery (EOR) methods, foam, as a compressible non-Newtonian fluid, shows good fluidity as a control system; it also has the advantage of weak damage to the oil layer after defoaming. , In addition, given its unique microstructure, foam has the characteristics of “blocking high but not low, blocking large but not small, blocking water but not oil, defoaming when encountering oil, and stabilizing when encountering water”, which are considered ideal in development methods for cost reduction and production increment. − Foams could be classified as carbon dioxide foam, nitrogen foam, air foam, and natural gas foam based on the source gas. , It can be known that carbon dioxide foam is currently the most widely used type of foam in oilfields . Especially, there is a lot of laboratory theoretical research on EOR in micropores by carbon dioxide. , As a kind of high-quality gas source, natural gas will not pollute the reservoir, and it has little corrosion to the injection and production system. In addition, the internal natural gas can interact with the crude oil to expand the volume of crude oil and reduce the viscosity of crude oil after defoamation.…”

Section: Introductionmentioning

confidence: 99%

“…9 Especially, there is a lot of laboratory theoretical research on EOR in micropores by carbon dioxide. 10,11 As a kind of high-quality gas source, natural gas will not pollute the reservoir, and it has little corrosion to the injection and production system. In addition, the internal natural gas can interact with the crude oil to expand the volume of crude oil and reduce the viscosity of crude oil after defoamation.…”

Section: Introductionmentioning

confidence: 99%

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Research on the Properties of Natural Gas Foamed Gel as a Profile Control and an Oil Displacement Agent in Strong Heterogeneous Reservoirs

Lai

Yuan

Li³

et al. 2021

Energy Fuels

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To alleviate the uneven production of extreme heterogeneous reservoirs, we developed a high-strength natural gas foamed gel system by adding a gel system to the foaming agent solution. The Ostwald ripening rate and the gas molecular diffusion coefficient (D diff) were calculated. The number of bubbles, the average diameter(D ad), and the poly-dispersion coefficient (U poly) of the foamed gel system have been considered within, as well as the different temperature, salinity, pressure, and crude oil conditions and the stability of the foamed gel system. Moreover, combining laboratory displacement experiments and core nuclear magnetic (NMR) experiments, the oil displacement ability of natural gas foamed gel was studied. The results showed that different from the previous phenomenon of “defoaming with oil”, adding a certain amount of crude oil into the natural gas foamed gel could improve its foaming performance. According to this phenomenon, we conducted experiments on the stability and viscosity enhancement of the emulsion and explored the stability of the pseudo-emulsion film of foamed gel. In addition, this natural gas foamed gel system had a better ability to control profile and enhance oil recovery when the permeability ratio was 75–150. When the permeability ratio was 150, the low-permeability core diversion rate was about 38%, and the EOR was 35.27%. Finally, the core NMR results showed that the main contribution of water flooding recovery came from macropores. In construct, the recovery efficiency of natural gas foamed gel system mainly came from medium and small pores (effective areas not affected by water flooding). This study would provide a different thought for foam in production while dealing with extreme heterogeneity formations.

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