Jitendra S. Sangwai

Bio: Jitendra S. Sangwai is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Hydrate & Clathrate hydrate. The author has an hindex of 31, co-authored 161 publications receiving 3200 citations. Previous affiliations of Jitendra S. Sangwai include Indian Institutes of Technology & University of Western Australia.

Silica Nanofluids in an Oilfield Polymer Polyacrylamide: Interfacial Properties, Wettability Alteration, and Applications for Chemical Enhanced Oil Recovery

Abstract: Oil production from matured crude oil reservoirs is still associated with low recovery factors. Chemical enhanced oil recovery (EOR) is one of the techniques which can significantly improve the recovery factor of the trapped oil. This is mainly achieved by lowering the interfacial tension (IFT) of the crude oil–brine/aqueous chemical and increasing the viscosity of the injected fluid. Nanofluids have demonstrated potential in this respect, and we thus examined how such nanofluids behave when formulated with standard oilfield polymers, with a particular focus on their EOR efficiency. In this work, silica (SiO2) nanofluids with (NSP) or without (NP) surfactant (sodium dodecyl sulfate) added and with varying nanoparticle concentration were formulated with polyacrylamide (PAM) and characterized by DLS and ζ-potential measurements. These nanofluids were then tested in EOR core-flood experiments. Various studies involving the stability and viscosity of nanofluids, interfacial tension of the nanofluid-crude oil ...

Formation and Dissociation Kinetics of Methane Hydrates in Seawater and Silica Sand

Abstract: Understanding the kinetics of gas hydrate formation and dissociation in porous media has become important since their discovery in permafrost locations and marine sediments. Natural gas hydrates are now recognized as a huge potential source of methane gas. The present work is focused on understanding the kinetics of methane hydrate formation and dissociation in pure water and seawater. Methane gas hydrate formation and dissociation kinetics were studied in Toyoura sand (100–500 μm) with pure water at 8 MPa (driving force of 4.2 MPa) and seawater at 8 and 10 MPa (driving force of 6.2 MPa) and a temperature of 277.15 K. For the present work, 3.03 wt % saline seawater obtained from Pulau Tekong (Singapore) is used. The methane hydrate formation kinetics in Toyoura sand and 100% pure water saturation at 277.2 K and 8.0 MPa was found to agree well with the literature works. For experiments conducted at 277.2 K and a driving force of 4.2 MPa, water conversion to hydrate for the experiments conducted with pure w...

I and i

Abstract: 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 …

A User’s Guide

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Principles Of Enhanced Heat Transfer

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