In-situ emulsification synergistic self-profile control system on heavy oil reservoir development: Prescription construction and EOR mechanism investigation

Wang, Tengfei; Wang, Liangliang; Wang, Jiexiang; Qin, Haipeng; Yuan, Chengdong

doi:10.1016/j.petrol.2022.111069

Cited by 13 publications

(3 citation statements)

References 34 publications

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“…There are more cluster residual oils with small areas after flooding with betaine solutions. It is widely believed that heterogeneity tends to result in the crossflow phenomenon (Wang et al, 2022). Since the plugging effect enhances the heterogeneity of pore throats, the displacement solutions are more likely to migrate along the high-permeability pathway and the effects of the displacement surfactants become weakened.…”

Section: Oil Displacement Experiments On the Heterogeneous Modelmentioning

confidence: 99%

Study on the mechanism of surfactant flooding: Effect of betaine structure

Lv,

Zhou,

Zhang

et al. 2023

Adv. Geo-Energy Res.

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In order to elucidate the oil displacement mechanism of micro-emulsions formed by different betaines at pore throats, this study selected three betaine surfactants with different hydrophobic branched chains for a microscopic visualization oil displacement experiment. The interfacial tension, dilational modulus, interactions of oil droplets, and apparent viscosity of the emulsions were measured. Besides, the microscopic oil displacement mechanism and oil displacement effects of different betaines in homogeneous and heterogeneous models were investigated. The results revealed the beneficial interfacial activity and viscosity enhancement effects of the three betaine solutions. With the increase in the branched degree of betaines, the strength of interfacial films and the viscosity enhancement effect decreases. In the homogeneous model, betaine solutions emulsify crude oil into droplets with strong interfacial films. The in-situ plugging effect improves oil recovery and the sweep efficiency in the pore throats, and the remaining oil is mainly in the form of droplets. As the branched degree increases, the strength of the interfacial films and the oil recovery decline. In the heterogeneous model, the plugging effect enhances the pore structure heterogeneity. The three betaine solutions can increase the sweep efficiency but the displacement solutions only migrate along the dominant pathway within the sweep range. As a result, a large amount of isolated cluster residual oil remains, resulting in similar oil recovery efficiency for betaine flooding to that of water flooding in the heterogeneous model.

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Section: Oil Displacement Experiments On the Heterogeneous Modelmentioning

confidence: 99%

Study on the mechanism of surfactant flooding: Effect of betaine structure

Lv,

Zhou,

Zhang

et al. 2023

Adv. Geo-Energy Res.

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“…16,17 The polymer-based displacement control system enhances sweep efficiency and increases the oil−water contact area by obstructing high permeability channels, leading to efficient oil displacement. 18 However, there are still some challenges that need to be addressed, such as developing high water consumption zones in the later stage of high water content, dealing with severe inefficient water circulation, finding ways to effectively utilize remaining oil in fault block reservoirs, injecting steam into deep and thin layers of ultraheavy oil, managing high heat loss, treating severe scaling in alkaline composite flooding oil systems, addressing stronger dynamic heterogeneity of reservoirs after polymer flooding, and dealing with more dispersed remaining oil. 19 Physical instabilities in water injection involve the continuous alteration of the pressure difference, creating physical disturbances that disrupt the equilibrium of local oil−water interfaces.…”

Section: Introductionmentioning

confidence: 99%

“…As for development technology, microbial system oil recovery primarily reduces crude oil viscosity and oil–water interfacial tension by altering the properties of crude oil through metabolic products that lead to efficient percolation . The hot fluid system for oil recovery mainly improves the flow efficiency by heating crude oil, reducing its viscosity, dissolving and expanding it, and also maintaining formation pressure. , The polymer-based displacement control system enhances sweep efficiency and increases the oil–water contact area by obstructing high permeability channels, leading to efficient oil displacement . However, there are still some challenges that need to be addressed, such as developing high water consumption zones in the later stage of high water content, dealing with severe inefficient water circulation, finding ways to effectively utilize remaining oil in fault block reservoirs, injecting steam into deep and thin layers of ultraheavy oil, managing high heat loss, treating severe scaling in alkaline composite flooding oil systems, addressing stronger dynamic heterogeneity of reservoirs after polymer flooding, and dealing with more dispersed remaining oil …”

Section: Introductionmentioning

confidence: 99%

Mechanism of Pressure Difference Variations on Heavy Oil Start-Up and Percolation Effects

Liu,

Yang,

et al. 2024

ACS Omega

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To investigate the influence of pressure difference changes on the micro start-up and percolation of heavy oil, a micro visualization displacement device was used to characterize the startup time and oil−water percolation state of heavy oil. The mechanism of different pressure differences, as well as the frequency and amplitude of pressure difference changes, on the start-up and percolation balance of heavy oil was clarified. The results indicate that high-pressure difference and pressure difference changes can reduce the start-up time of heavy oil. A reasonable frequency of pressure difference changes effectively promotes the balance between positive and negative pressure shear and fluid−solid response. Large pressure difference changes can effectively break the viscous and adsorption resistance during heavy oil start-up; reasonable pressure difference can exert the synergistic effect of pressure difference and infiltration, achieving a balance between the water wave and the initial water film thickening process as well as the continuous percolation process of wire drawing, oil droplets, and oil columns during the mediumto-high water content period; a reasonable frequency of pressure difference variation during the high water content period can promote the superposition of inertia effects at the oil−water interface and break the balance of the oil−water interface. A large amplitude of pressure difference variation is beneficial for the strong deformation of the oil−water interface and the shear dislocation peeling of the oil−solid interface. Therefore, a relatively high amplitude of pressure difference variation and a reasonable frequency of pressure difference variation, as well as the synergistic effect of pressure difference and infiltration, are the keys to effectively start heavy oil and improving oil recovery during the ultrahigh water-cut period.

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