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Open research questions in Enhanced Oil Recovery Techniques

129 unresolved questions extracted from the limitations and future-work sections of 586 Enhanced Oil Recovery Techniques papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • The complexity of the underlying physicochemical interactions in amine-ether gemini surfactant emulsion flooding. The difficulty in describing the system rigorously using a single reaction equation. The need to balance oil-displacement performance and project economics in optimizing injected slug size.

    A Refined Numerical Simulation Method for Amine-Ether Gemini Surfactant Emulsion Flooding · 2026 · DOI

  • further study on the physicochemical mechanisms of amine-ether gemini surfactant emulsion flooding, - investigation of the applicability of the method to different types of reservoirs, - optimization of the injection design parameters for various field conditions

    A Refined Numerical Simulation Method for Amine-Ether Gemini Surfactant Emulsion Flooding · 2026 · DOI

  • The study did not investigate the long-term effects of the nanomicelles on the environment, - The study did not examine the potential toxicity of the nanomicelles, - The study was limited to a specific type of reservoir and may not be applicable to all types of reservoirs

    Construction of Sulfonated Poly(Aryl Ether Ketone) Nanomicelles and Their Dispersion–Displacement Synergistic Mechanism in Deep Oil Recovery · 2026 · DOI

  • Conventional surfactant systems and inorganic nanoparticle-based EOR materials have limitations - Insufficient interfacial tension reduction for deep oil recovery - Need for novel oil-displacement materials with environmental adaptability and functional displacement capability

    Construction of Sulfonated Poly(Aryl Ether Ketone) Nanomicelles and Their Dispersion–Displacement Synergistic Mechanism in Deep Oil Recovery · 2026 · DOI

  • Preferential flow and limited sweep expansion in high-permeability reservoirs. Complex remaining-oil occurrence. Difficulty in accurately revealing the microscopic control mechanisms of waterflood sweep characteristics and remaining-oil distribution.

    Controlling Effect of Heterogeneity in High-Permeability Reservoirs on Waterflood Sweep Characteristics and Remaining-Oil Distribution · 2026 · DOI

  • The coupled effects of pore-structure heterogeneity, fluid seepage characteristics, and development parameters on remaining oil distribution are not well understood. The microscopic control mechanisms of waterflood sweep characteristics and remaining-oil distribution are not accurately revealed.

    Controlling Effect of Heterogeneity in High-Permeability Reservoirs on Waterflood Sweep Characteristics and Remaining-Oil Distribution · 2026 · DOI

  • Salinity has a significant impact on surfactant flooding performance. The chemical stability of the injected formulation under reservoir conditions is critical. There is a need to optimize surfactant concentration to avoid phase compatibility problems and higher costs.

    Salinity Effects on Surfactant Flooding Performance in Associated Gas Reservoirs: A Simulation-Guided Evaluation of Transport, Adsorption, and Oil Recovery · 2026 · DOI

  • investigating the effect of gas composition on surfactant flooding performance, - studying the impact of other factors on surfactant flooding performance, - optimizing surfactant concentration and salinity for improved oil recovery

    Salinity Effects on Surfactant Flooding Performance in Associated Gas Reservoirs: A Simulation-Guided Evaluation of Transport, Adsorption, and Oil Recovery · 2026 · DOI

  • Ultra-low permeability and complex fracture-matrix architecture of tight oil reservoirs. Limited understanding of the coupled effects of key operational parameters on reservoir pressure evolution, fracture-matrix mass transfer, and oil mobilization. Difficulty in optimizing CO2 injection parameters for improved oil recovery in tight oil reservoirs.

    Effects of Injection–Production Parameters in Inter-Fracture Gas Injection for Horizontal Wells of the Changqing Yuan 284 Tight Oil Reservoir · 2026 · DOI

  • The study only considers a specific reservoir - The simulations are based on a limited number of parameters - The model does not account for all possible complexities of the reservoir

    Effects of Injection–Production Parameters in Inter-Fracture Gas Injection for Horizontal Wells of the Changqing Yuan 284 Tight Oil Reservoir · 2026 · DOI

  • The high viscosity and freezing point of heavy oil pose significant challenges to its extraction and transportation. The difficulty in breaking emulsions stabilized by nanoparticles. The need for effective methods for viscosity reduction of heavy oil.

    Fe3O4@SiO2-hexamethyldisilazane amphiphilic magnetic emulsifier for viscosity-reduction of heavy oils via aquathermolysis reaction · 2026 · DOI

  • Further research could investigate the use of the Fe₃O₄@SiO₂-HMDS emulsi er in other applications, such as in the food or pharmaceutical industries - Research could also focus on optimizing the synthesis and properties of the emulsi er for improved performance - The development of new methods for recycling the emulsi er could also be an area of future research

    Fe3O4@SiO2-hexamethyldisilazane amphiphilic magnetic emulsifier for viscosity-reduction of heavy oils via aquathermolysis reaction · 2026 · DOI

  • the study only examined two multi-rate viscoelastic polymer flooding experiments, - the experiments were conducted at a temperature of 75 °C, - the study used Indiana limestone as the core material, - the core plugs had a limited range of porosity values

    Impact of the Water-Flooding Rate History on Viscoelastic Polymer Flood Performance in Oil-Wet Carbonates · 2026 · DOI

  • investigating the effects of different injection flow rates on the onset of Newtonian, shear-thinning, and shear-thickening behaviors, - studying the behavior of the polymer inside the porous media, - examining the potential of synthetic viscoelastic polymer solutions to improve residual oil recovery beyond that of water flooding

    Impact of the Water-Flooding Rate History on Viscoelastic Polymer Flood Performance in Oil-Wet Carbonates · 2026 · DOI

  • a systematic review of the SiO2-NP functionalization and characterization is still lacking, - the average recovery efficiency of existing oil extraction technologies is generally not high enough to meet demands, - current research gaps are identified

    A Review on Surface Functionalization and Characterization of Silicon Oxide Nanoparticle: Implications for Enhanced Hydrocarbon Recovery · 2024 · DOI

  • guidance for SiO2-NP surface functionalization, characterization, and evaluation, - future outlooks are indicated, - the experimental design of the SiO2-NP functionalization process and its application in EOR

    A Review on Surface Functionalization and Characterization of Silicon Oxide Nanoparticle: Implications for Enhanced Hydrocarbon Recovery · 2024 · DOI

  • However, the relationship between the microstructure of demulsifiers and their demulsification performance remains inadequately understood at the molecular level.

    Head Group-Induced Interfacial Water Rearrangement during Demulsification: A Study at the Molecular Level · 2026 · DOI

  • A systematic investigation of the effects of temperature and surfactant on wettability in mineral-oil-water systems is still lacking.

    Impacts of Temperature and Surfactant on Wettability in Mineral–Oil–Water Systems · 2025 · DOI

  • Thermal-chemical flooding with hot water is a widely used method for heavy oil recovery, yet its efficiency is often limited by the degradation of conventional viscosity reducers under high-temperature conditions.

    A Thermo-Stable Polymeric Surfactant for Enhanced Heavy Oil Recovery via Hot Water Chemical Flooding · 2025 · DOI

  • Although conventional compound oil displacement systems can effectively reduce oil–water interfacial tension, facilitate oil droplet deformation, and alleviate the Jamin effect, they are insufficient in controlling the wettability of oleophilic rock surfaces.

    Compound Surfactant System with Superior Oil Displacement Performance: Balanced Synergistic Effects from Oil–Water and Oil–Solid Interfaces · 2025 · DOI

  • Taking barite precipitation as an example, previous studies have examined this process in porous and/or fractured media, but pore-scale mechanisms under varying flowing and geochemical conditions remain unexplored.

    Controls of the Nucleation Rate and Advection Rate on Barite Precipitation in Fractured Porous Media · 2025 · DOI

  • However, the mechanisms governing the initiation and growth of FPs are still not fully understood, and their regulation often relies on empirical knowledge and practice.

    Hydrodynamics Coupled Simulation of Fingerlike Pore Formation During Nonsolvent Induced Phase Separation · 2025 · DOI

  • Certain surfactants exhibiting ultralow interfacial tension can solubilize oil, thereby generating microemulsions, whereas other surfactants are limited to the formation of thermodynamically unstable emulsions.

    Mobilization of Oil through In Situ Emulsification in a Porous Medium: A Comparative Analysis of Oil Solubilization and Interfacial Tension Reduction · 2025 · DOI

  • This work systematically elucidates the oil displacement mechanisms of MNSP, providing a theoretical foundation for further research on similar polymer oil displacement mechanisms.

    Mechanistic Insights into Nanoparticle-Modified Polymer Flooding for Enhanced Oil Recovery · 2025 · DOI

  • However, their microscopic displacement mechanisms remain incompletely understood.

    Mechanistic Insights into Nanoparticle-Modified Polymer Flooding for Enhanced Oil Recovery · 2025 · DOI

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129 open questions have been extracted from the limitations and future-work passages of 586 Enhanced Oil Recovery Techniques papers in our 4.5M-paper local library. Each one below links back to the study that raised it, so you can read the original claim in context.

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