Relevance between Emulsification Capability and Interfacial Tension of Chemical Flooding Agents

Guo, Yabing; Yue, Xiang-an; Fu, Joseph; Zhang, Bo

doi:10.1021/acs.energyfuels.8b03110

Cited by 19 publications

(9 citation statements)

References 29 publications

(36 reference statements)

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“…48,49 The ability of the chemical flooding agent to reduce the IFT indicates its adsorption state on the oil−water interface film during stable adsorption. 50,51 The minimum emulsification speed indicates the ability of the chemical flooding agent to emulsify crude oil within a certain period of time. 52−54 This test refers to the speed at which the chemical flooding agent adsorbs on the oil−water interface.…”

Section: Heavy Oil Emulsification Ability Of a Chemical Flooding Agentmentioning

confidence: 99%

Influence of Emulsification Characteristics on the Pressure Dynamics during Chemical Flooding for Oil Recovery

Liu

Zhang³

et al. 2023

Energy Fuels

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Chemical flooding agents, especially surfactant-based flooding oil agents, have been widely studied due to their excellent emulsification ability. Nevertheless, there are many evaluation methods for chemical flooding agents, and the focus of each test is different. How to combine routine testing with reservoir conditions is an urgent problem to be solved. In this study, different kinds of chemical flooding agents were evaluated for interfacial tension (IFT), minimum emulsification speed, emulsification state, droplet size distribution, viscoelasticity, apparent viscosity in porous media, stability, and flooding efficiency. The influence of their characteristics on the pressure dynamics during flooding is analyzed, and the mechanism in the different stages of chemical flooding is clarified. A comprehensive analysis of IFT and the minimum emulsification speed is needed to evaluate the emulsification ability. The apparent viscosity when W/O emulsion flows through porous media is more accurate to evaluate the viscosity reduction of the chemical flooding agents than the traditional viscosity test. The chemical flooding dynamics is mainly divided into three stages: pressure increase (emulsification ability), pressure decrease (fluidity of formed oil in water (O/W) emulsion), and pressure stabilization (flooding efficiency). The stronger the emulsification ability, the faster the pressure increase and the wider the main flow channel. The easier the O/W emulsion is formed, the smaller the droplet size, the stronger the elastic deformation ability, and the higher the oil flooding efficiency. The smaller the droplet size and the stronger the viscoelasticity of O/W emulsion, the lower the maximum pressure in the flooding process and the slower the pressure decrease in the middle stage. Therefore, the evaluation of chemical flooding agents should mainly consider their emulsification ability and the formed O/W emulsion droplet size, viscoelasticity, and stability. This study clarified the evaluation focus of chemical flooding, and laid a foundation for the research and development and screening of chemical flooding agents, and the dynamic analysis of chemical flooding.

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Section: Heavy Oil Emulsification Ability Of a Chemical Flooding Agentmentioning

confidence: 99%

Influence of Emulsification Characteristics on the Pressure Dynamics during Chemical Flooding for Oil Recovery

Liu

Zhang³

et al. 2023

Energy Fuels

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“…Emulsification capability tests were conducted on a dynamic visualization characterizer using ultrasonic vibration. The emulsification capacity performance can be quantitatively evaluated using the emulsification index, of which the method is detailed in the literature. , The stronger the emulsifying capability for the surfactant, the easier it is to emulsify the crude oil.…”

Section: Experimental Sectionmentioning

confidence: 99%

Role of Emulsification and Interfacial Tension of a Surfactant for Oil Film Displacement

Yue

Wang

et al. 2021

Energy Fuels

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The oil film after water flooding is a very important type of microscopic residual oil for an oil-wet reservoir. In this study, an artificial oil film model was designed to simulate the micro residual oil absorbed on the rock surface. Numerous experiments were carried out to explore the detachment mechanisms of two kinds of crude oil films and oil recovery performances in different fluid media with the flow rate. The results show that the increasing flow rate positively affects the oil film detachment but is still limited in the action area and displacement efficiency. It is also found that surfactants with different interfacial tensions (IFTs) and emulsification behaviors all can promote the dislodging of the oil film. The results show that the most important factor contributing to the detachment of the oil film is the emulsification rather than IFT reduction. Strong emulsification is useful to lessen the thickness of the oil film and disperse the oil droplets into a smaller size without considering the flow rate. This paper also provides evidence that, for the case of a higher proportion on heavy components of crude oil, strong emulsification capability is the chief driver for the oil enhancement mechanism for surfactant flooding.

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“…Moreover, a kind of flexible Janus nanosheet (3-butyldianhydride mercaptopropyltrimethoxysilane (BDMPS)) was synthesized to be an excellent solid emulsifier . Numerous lab studies and literature studies of field applications strongly reveal that better emulsification of crude oil during migration in low-permeability reservoirs can further enhance oil recovery. − Emulsion systems can increase both micro-oil displacement efficiency and macro-sweep efficiency. , Hence, emulsions’ stability is essential for enhanced oil recovery, requiring that the emulsifiers have some unique properties, including considerable viscoelasticity, microsize emulsions, and high-temperature resistance and salt tolerance in low-permeability reservoirs. , …”

Section: Introductionmentioning

confidence: 99%

Amphiphilic Rhamnolipid Molybdenum Disulfide Nanosheets for Oil Recovery

Hou

Liang

et al. 2021

ACS Appl. Nano Mater.

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Much attention has been directed toward amphiphilic nanosheets in diverse applications owing to their remarkable properties. In this work, the rhamnolipid-molybdenum disulfide nanosheets, environmentally friendly biological-amphiphilic-nanosheets (BANs), are prepared through the one-step simple hydrothermal method. The ultralow concentration of BANs (0.005 wt %), as a solid emulsifier, can emulsify crude oil and stabilize the size of emulsions (oil in water) within 1.2 μm. The adsorption of BANs to the oil−water interface improves the stability of the BANs emulsion, and it both reduces interfacial tension and increases interfacial film strength. Tremendous desorption energy (thousands of K B T) is required to remove a single BAN from the interface to the bulk phase. Besides, BANs can turn an oil-wet surface into an intermediate-wet surface and spread to exfoliate oil film on the solid surface. The evolution of the three-phase contact line experiences two stages: a steep stage and a gentle stage. The spreading behaviors are due to an imbalance between the surface forces and structuring disjoining pressure at the confinement region (wedge film). Moreover, 25.3% of additional oil recovery was observed from the flooding of an ultralow concentration of BANs nanofluid (0.005 wt %) in a natural outcrop core, which is 2.5 mD in permeability at experimental conditions: 120 °C and around 25 × 10 4 mg/L in salinity. The high tolerance of rhamnolipid-molybdenum disulfide nanosheets to high temperature and harsh salinity is because of synergism between MoS 2 nanosheets and rhamnolipid molecules. Additional residual oil reduction is due to a combination of multiple effects such as crude oil emulsification, wettability alteration, interfacial tension reduction, and formation of structuring disjoining pressure. This study presents the possibility to enhance oil recovery in low-permeability reservoirs with harsh conditions.

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Relevance between Emulsification Capability and Interfacial Tension of Chemical Flooding Agents

Cited by 19 publications

References 29 publications

Influence of Emulsification Characteristics on the Pressure Dynamics during Chemical Flooding for Oil Recovery

Influence of Emulsification Characteristics on the Pressure Dynamics during Chemical Flooding for Oil Recovery

Role of Emulsification and Interfacial Tension of a Surfactant for Oil Film Displacement

Amphiphilic Rhamnolipid Molybdenum Disulfide Nanosheets for Oil Recovery

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