Paul Apeye Lucky Anawe

Magneto-structural properties of Ni–Zn nanoferrites synthesized by the low-temperature auto-combustion method

Using nickel, zinc and ferric nitrates, and glycine in a fuel-rich composition, Ni1−x ZnxFe2O4 nanoparticles were prepared by a simple low-temperature auto-combustion method without further sintering at high temperatures. The auto-combusted powders obtained were characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy, energy-dispersive X-ray (EDAX) analysis and vibrating scanning magnetometer measurements. XRD confirms the formation of pure nanocrystalline spinel phases with an average diameter of about 55 nm. Raman spectra show tetrahedral and octahedral sites in the structure of Ni1−xZnxFe2O4 and also imply the doping of Zn2+ and displacement of Fe3+ ions from the tetrahedral site. EDAX showed that the samples were close to the nominal compositions. The magnetic measurement shows that the saturation magnetization and remanence magnetization decreases with the increase in the zinc content.

Data on the effect of incorporation of nanoparticles and process characteristics of Ni–SiO2 coating on oil and gas steel

In this work, data on the effect of process parameter and particle concentration on the developed Ni–SiO2 produced via electrocodeposition were presented. The influence of current density from 0.6 to 1.0 A/dm2 and applied time difference from 10 to 25 min observed on the hardness characteristics and texture performance of the deposited alloy was checked. The weight gained and thickness of surface coverage was acquired and could be further used as a protoype for designing a ternary alloy coating system for oil and gas services.

Modelling the Effect of Composition Change During Condensate Dropout in a Horizontal Gas Well

This paper presents a mathematical model describing the behavior analysis for a two-phased gas-condensate system narrowing down on the three zone method. The three zone method accounts for the composition change in the reservoir and is based on modeling the depletion by three main flow regions: • A near wellbore region (Region 1) where the oil saturation is important allowing both phase, vapor and liquid to be mobile. • Region 2 where condensate and gas are present but only the gas is mobile. • An outer Region 3 exists when the reservoir pressure is greater than the initial gas dew point and contains only gas. This research proposed a fourth region (Region I) which is the immediate vicinity of the well where accumulation of liquid buildup at high rates which yielded from an increase of liquid saturation and a probable decrease in gas relative permeability. The existence of the fourth region or flushed zone is particularly important as it represent the total skin effect: mechanical skin, rate dependent two-phase skin and skin due to gas condensate blockage. The calculated well deliverability rate using the modeled equation for gas condensate reservoir showed a relatively high difference when compared to other known equations. This significant difference is as a result of the effects of the proposed Region I. The developed correlation confirms that as the pressure drops below dew point there occurs condensate banking which when the critical saturation is reached becomes mobile and leads to a reduction in gas flow rate in the reservoir.