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.

/pdf/an-overview-of-chemical-enhanced-oil-recovery-recent-50o04svogl.pdf

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

A novel nanofluid based on fluorescent carbon nanoparticles for enhanced oil recovery (EOR) was developed. Fluorescent carbon nanoparticles prepared by a simple and rapid method were used as a chemical agent for EOR and fluorescence imaging. Transmission electron microscope and Fourier transform infrared spectrometer were employed to observe the shape, size, and surface components of the fluorescent carbon nanoparticles. The fluorescent carbon nanoparticles could be instantly dispersed in water without any auxiliary equipment. The nanofluid showed excellent antitemperature, antisalinity, oil displacement, and wettability alteration properties. The nanofluid (0.1 wt %) could reduce the oil–water interfacial tension to 13.4 mN/m. The oil recovery of a core immersed in nanofluid was significantly improved. The core intersection was observed by a fluorescence microscope. The fluorescence image demonstrated that the fluorescent carbon nanoparticles had seeped into the core. The fluorescent carbon nanoparticle-...

A Novel Nanofluid Based on Fluorescent Carbon Nanoparticles for Enhanced Oil Recovery

Experimental investigation of spontaneous imbibition process of nanofluid in ultralow permeable reservoir with nuclear magnetic resonance

Impairment mechanism of thickened supercritical carbon dioxide fracturing fluid in tight sandstone gas reservoirs

Nanofluids have increasingly drawn interest in recent years with their various applications in a number of fields. The method for the preparation of stable nanofluids is a key concern for extending the application of nanofluids. This study focuses on the effect of pH, dosage of surfactant (TX-100), and nanofluid concentration on the stability of a silica nanofluid. Particle size and zeta potential are two important factors to consider in evaluating the stability of the silica nanofluid. Results indicate that the stability of the silica nanofluid highly depends on pH, dosage of surfactant (TX-100), and nanofluid concentration. On the basis of these experiments, the best conditions for the preparation of a silica nanofluid are 0.1 wt. % for the concentration of silica nanoparticles and TX-100 and 10 for pH. A transparent and stable silica nanofluid can thus be obtained.

https://www.mdpi.com/1996-1944/11/8/1385/pdf/1

A Study on Preparation and Stabilizing Mechanism of Hydrophobic Silica Nanofluids.

Precisely tailoring bubble morphology is always a long-standing great challenge. In this work, a facile and scalable method to generate nonspherical bubbles with long-term stability is proposed. Taking advantage of the electrostatic interaction between silica nanoparticles (SNPs) and cationic surfactants, the SNPs are decorated with surfactants and endowed with interfacial activity. Due to the rearrangement of surfactants, the decorated SNPs transform to a kind of Janus particles at the gas–liquid interface. By precisely manipulating the surface activity, packing density, and jamming of Janus SNPs at the bubble surface, four different shapes such as oblaten-like, bullet-like, tadpole-like, and worm-like bubble were obtained continuously in the microchannel. Herein, our method to generate bubbles with a prescribed shape poses opportunities for gas microreactor, cavity material, gas storage, and provide a platform to study the applicable scope of the Young–Laplace equation.

Mingwei Zhao

Papers

A Novel Nanofluid Based on Fluorescent Carbon Nanoparticles for Enhanced Oil Recovery

Experimental investigation of spontaneous imbibition process of nanofluid in ultralow permeable reservoir with nuclear magnetic resonance

Impairment mechanism of thickened supercritical carbon dioxide fracturing fluid in tight sandstone gas reservoirs

A Study on Preparation and Stabilizing Mechanism of Hydrophobic Silica Nanofluids.

Precisely Tailoring Bubble Morphology in Microchannel by Nanoparticles Self-assembly