Resonance-Enhanced Pulsing Water Injection for Improved Oil Recovery: Micromodel Experiments and Analysis

Article Chemistry, Physical

Mechanism underlying initiation of migration of film-like residual oil

Xu Han et al.

Summary: The study demonstrated that using high viscosity polymer results in larger contact angle and smaller adhesion work. Additionally, lower interfacial tension in the alkali-surfactant-polymer (ASP) system leads to increased adhesion work.

JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY (2022)

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Article Thermodynamics

Microscopic remaining oil initiation mechanism and formation damage of CO2 injection after waterflooding in deep reservoirs

Xue Zhang et al.

Summary: Injecting CO2 into deep reservoirs with high temperature and pressure has the potential to enhance oil recovery and CO2 utilization and storage. This study conducted water/gas flooding experiments in a microfluidic system to investigate the mechanisms of micro-remaining oil and formation damage. The results showed that scCO2 extraction and carbonated water swelling recovered a significant amount of remaining oil. Additionally, water injection into heterogeneous reservoirs resulted in unstable displacement fronts in high-permeability zones. The subsequent injection of scCO2 led to asphaltene deposition and reduced reservoir permeability.

ENERGY (2022)

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Article Energy & Fuels

Microfluidics experimental investigation of the mechanisms of enhanced oil recovery by low salinity water flooding in fractured porous media

Atena Mahmoudzadeh et al.

Summary: Spontaneous imbibition of water from fracture into the matrix is an important recovery mechanism in fractured porous media, with wettability alteration known as the main affecting mechanism for low salinity water flooding. The effectiveness of low salinity water flooding on oil recovery is compared to formation water and seawater in various fractured models, showing positive effects in both water-wet and oil-wet states.

FUEL (2022)

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Article Energy & Fuels

An investigation of viscous oil displacement in a fractured porous medium using polymer-enhanced surfactant alternating foam flooding

Ahmed Bashir et al.

Summary: Foam flooding is recommended for naturally fractured reservoirs, but it faces challenges in heavy oil reservoirs. This study investigates a new hybrid enhanced oil recovery process called polymer-enhanced surfactant alternating foam (PESAF) flooding, which proves effective in displacing high viscosity oils in fractured porous media.

JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING (2022)

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Article Energy & Fuels

Impact of salinity on fluid/fluid and rock/fluid interactions in enhanced oil recovery by hybrid low salinity water and surfactant flooding from fractured porous media

Amir Hossein Javadi et al.

Summary: Wettability alteration from oil-wet to water-wet is proposed as a mechanism for enhanced oil recovery. However, in a specific crude-oil/brine/rock system, low salinity water flooding was found to be ineffective. Chemical EOR, by adding a cationic surfactant to the injecting brine, was suggested as a hybrid technique to improve oil recovery in such cases. Contact angle, zeta potential, and IFT tests, as well as dynamic micro-model tests in fractured porous media, were conducted to study the interactions and displacement mechanisms. Experimental results showed that the surfactant absorbed on the oil/brine interface, leading to detachment of oil droplets and enhancement of oil recovery.

FUEL (2022)

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Article Energy & Fuels

Visualization study of CO2-EOR in carbonate reservoirs using 2.5D heterogeneous micromodels for CCUS

Qichao Lv et al.

Summary: Carbonate reservoirs have great potential for CO2 geological sequestration and enhanced oil recovery, and the use of NPs-armor stabilized CO2 foams can effectively control CO2 mobility.

FUEL (2022)

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Article Energy & Fuels

Experimental study of the low salinity water injection process in the presence of scale inhibitor and various nanoparticles

Azizollah Khormali et al.

Summary: In this study, the changes in the oil recovery factor during oil production were investigated by simulating low salinity water injection (LSWI) into reservoirs at various salt concentrations. The simulation results were found to be in good agreement with the experimental data. Furthermore, the formation damage in LSWI was evaluated through coreflood experiments, and a correlation was used to predict the formation damage. The use of a scale inhibitor and various nanoparticles was also analyzed, and it was found that they can enhance the recovery factor during LSWI.

JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY (2022)

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Article Thermodynamics

Microscopic transport and phase behaviors of CO2 injection in heterogeneous formations using microfluidics

Yaohao Guo et al.

Summary: CO2 injection into geological formations is a promising option for enhanced oil recovery and carbon storage. This study uses microfluidics to directly observe the multiphase flow behaviors and phase change in CO2 injection, revealing that miscible injection can improve recovery rate and reduce heterogeneity impact, and huff-n-puff operations can re-energize the reservoir and increase cumulative recovery.

ENERGY (2022)

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Article Energy & Fuels

A quantitative study of salinity effect on water diffusion in n-alkane phases: From pore-scale experiments to molecular dynamic simulation

Lifei Yan et al.

Summary: The effect of salinity on the water diffusion and behavior in low-salinity waterflooding process is investigated. It is found that ionic strength and hydrocarbon chain length play important roles in water diffusion. High salinity limits the water diffusion into the oil phase and enhances the net flux of water from the pure water side to the salty waterside.

FUEL (2022)

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Article Energy & Fuels

Synergistic foam stabilization and transport improvement in simulated fractures with polyelectrolyte complex nanoparticles: Microscale observation using laser etched glass micromodels

Hooman Hosseini et al.

Summary: The study uses high throughput technologies to simulate the behavior of supercritical CO2 foam in tight shale formations under high-pressure flow conditions, revealing significant differences in foam stability and fluid loss properties in the presence of ionic complexes.

FUEL (2021)

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Article Energy & Fuels

A comprehensive insight on the impact of individual ions on Engineered Waterflood: With already strongly water-wet sandstone

Xiao Wang et al.

Summary: This study focused on examining the contribution of fluid-fluid interaction in Engineered Waterflood (EWF) processes using strongly water-wet rock samples. Results showed that low salinity and sulfate enrichment increase interfacial visco-elasticity, hindering microscopic displacement events, while lower brine salinity and sulfate enrichment can decrease the attraction force between oil and rock. By considering both fluid-fluid and fluid-rock interactions, this work sheds light on EWF mechanisms and clarifies the effect of sulfate in sandstone reservoirs.

JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING (2021)

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Article Energy & Fuels

Investigation on water phase trapping mechanisms in tight gas reservoirs: Pore-scale visualization observation and core-scale flooding analysis

Jian Tian et al.

Summary: This study investigated the formation process of water phase trapping (WPT) in tight gas reservoirs through both pore-scale and core-scale experiments. Snap-off and circumfluous flow were identified as the two major mechanisms for breaking bulk gas flow and generating trapped gas during WPT formation. Analysis of gas permeability and water saturation changes in response to WPT formation provided insights into the macroscopic consequences for gas flow ability.

JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING (2021)

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Article Chemistry, Multidisciplinary

Displacement Mechanisms of Residual Oil Film in 2D Microchannels

Jiawei Fan et al.

Summary: Increasing horizontal stress on the residual oil film can fundamentally mobilize the oil film and make it movable. Different theological properties of the displacement fluid can change the value and direction of horizontal stress acting on the residual oil film, affecting the mobilization of the oil film.

ACS OMEGA (2021)

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Article Energy & Fuels

IFT or wettability alteration: What is more important for oil recovery in oil-wet formation?

Z. Zhang et al.

Summary: This study addresses research gaps in understanding the dominant recovery mechanisms during surfactant flooding in unconventional, oil-wet reservoirs by investigating physico-chemical interactions and microfluidic studies using zwitterionic surfactant solutions. The observations show that significant IFT reduction and wettability alteration are both crucial for successful oil displacement in water-wet media during surfactant flooding in oil-wet formations.

FUEL (2021)

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Review Energy & Fuels