There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

Annual Energy Outlook

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Principles Of Enhanced Heat Transfer

Surfactants And Interfacial Phenomena

Despite the progress made on renewable energy, oil and gas remains the world’s primary energy source. Meanwhile, large amounts of oil deposits remain unrecovered after application of traditional oil recovery methods. Chemical enhanced oil recovery (EOR) has been adjudged as an efficient oil recovery technique to recover bypassed oil and residual oil trapped in the reservoir. This EOR method relies on the injection of chemicals to boost oil recovery. In this overview, an up-to-date synopsis of chemical EOR with detailed explanation of the chemicals used, and the mechanism governing their oil recovery application have been discussed. Challenges encountered in the application of the various conventional chemical EOR methods were highlighted, and solutions to overcome the challenges were proffered. Besides, the recent trend of incorporating nanotechnology and their synergistic effects on conventional chemicals stability and efficiency for EOR were also explored and analysed. Finally, laboratory results and field projects were outlined. The review of experimental studies shows that pore-scale mechanisms of conventional chemical EOR is enhanced by incorporating nanotechnology, hence, resulted in higher efficiency. Moreover, the use of ionic liquid chemicals and novel alkaline–cosolvent–polymer technology shows good potentials. This overview presents an extensive information about chemical EOR applications for sustainable energy production.

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An overview of chemical enhanced oil recovery: recent advances and prospects

Development, performance evaluation and enhanced oil recovery regulations of a zwitterionic viscoelastic surfactant fracturing-flooding system

Micelles formed by nonionic fluorocarbon surfactant N-(diethyleneglycol) perfluorooctane amide as a foaming agent due to its excellent foaming performance in aqueous solution were studied through surface tension, dynamic light scattering, isothermal titration calorimetry, and dissipative particle dynamic simulation. The surface activity, adsorption, and thermodynamic parameters (ΔG0m, ΔG0ads, ΔH0m, ΔS0m, ΔHAm, ΔC0p,m) of micellization were systematically investigated. The experimental results showed that this nonionic fluorocarbon surfactant had superior surface activity and the micelle formation was entropy-driven. The micelle formation was also demonstrated by dynamic light scattering and isothermal titration calorimetry. Furthermore, to better understand the micelle formation, dissipative particle dynamic (DPD) simulation was conducted to simulate the whole formation process.

Investigation of micelle formation by N-(diethyleneglycol) perfluorooctane amide fluorocarbon surfactant as a foaming agent in aqueous solution

The Effect and Enhancement Mechanism of Hydrophobic Interaction and Electrostatic Interaction on Zwitterionic Wormlike Micelles

The invention belongs to the field of oilfield chemistry, and particularly relates to a zirconium dispersoid gel complex oil displacing system. The zirconium dispersoid gel complex oil displacing system includes a multi-scale zirconium dispersoid gel, a polyether type nonionic surfactant and preparation water, wherein the mass fraction of the multi-scale zirconium dispersoid gel is 0.16%-0.24% of the total mass of the complex oil displacing system; the polyether type nonionic surfactant is 0.1%-0.4% of the total mass of the complex oil displacing system; the balance is water, and the total mass fraction of all components is 100%. According to the invention, the multi-scale zirconium dispersoid gel and the polyether type nonionic surfactant have excellent synergistic effect, and the oil-water interfacial tension can be reduced to the order of magnitudes of 10 mN/m, so that the displacement efficiency of an oil-displacing agent is remarkably improved, adverse effect caused by weakened viscosity of polymers in a binary combination flooding or a ternary combination flooding is avoided, and adverse effect caused by alkali is avoided, and the oil displacing effect of the complex oil displacing system is improved.

Mingwei Zhao

Papers

Development, performance evaluation and enhanced oil recovery regulations of a zwitterionic viscoelastic surfactant fracturing-flooding system

Investigation of micelle formation by N-(diethyleneglycol) perfluorooctane amide fluorocarbon surfactant as a foaming agent in aqueous solution

The Effect and Enhancement Mechanism of Hydrophobic Interaction and Electrostatic Interaction on Zwitterionic Wormlike Micelles

Zirconium dispersoid gel complex oil displacing system and preparing method thereof

Experimental Study on a Novel Thickened Supercritical CO2 System and its EOR Performance in Low Permeability Reservoir