Temperature dependence on the mass susceptibility and mass magnetization of superparamagnetic Mn–Zn–ferrite nanoparticles as contrast agents for magnetic imaging of oil and gas reservoirs

Abstract

(2018) Temperature dependence on the mass susceptibility and mass magnetization of superparamagnetic Mn-Zn-ferrite nanoparticles as contrast agents for magnetic imaging of oil and gas reservoirs, Journal of Experimental Nanoscience ABSTRACTThe mass susceptibility (x mass ) and mass magnetization (M mass ) were determined for a series of ternary manganese and zinc ferrite nanoparticles (Mn-Zn ferrite NPs, Mn x Zn 1¡x Fe 2 O 4 ) with different Mn:Zn ratios (0.08 x 4.67), prepared by the thermal decomposition reaction of the appropriate metal acetylacetonate complexes, and for the binary homologs (M x Fe 3¡x O 4 , where M = Mn or Zn). Alteration of the Mn:Zn ratio in Mn-Zn ferrite NPs does not significantly affect the particle size. At room temperature and low applied field strength the mass susceptibility increases sharply as the Mn:Zn ratio increases, but above a ratio of 0.4 further increase in the amount of manganese results in the mass susceptibility decreasing slightly, reaching a plateau above Mn:Zn % 2. The compositional dependence of the mass magnetization shows less of a variation at room temperature and high applied fields. The temperature dependence of the mass magnetization of Mn-Zn ferrite NPs is significantly less for Mn-rich compositions making them more suitable for downhole imaging at higher temperatures (>100 C). For non-shale reservoirs, replacement of nMag by Mnrich Mn-Zn ferrites will allow for significant signal-to-noise enhancement of 6.5£ over NP magnetite.

Nanomaterials and Technology Applications for Hydraulic Fracturing of Unconventional Oil and Gas Reservoirs: A State-of-the-Art Review of Recent Advances and Perspectives

“…In this case, magnetic nanoparticles with magnetic susceptibility significantly higher than that of nMag should be selected. Therefore, Morrow et al 171 have prepared a series of ternary manganese and zinc ferrite nanoparticles (Mn–Zn ferrite NPs) with a different Mn/Zn ratio for fracture detection of unconventional oil and gas reservoirs, such as shale. The size of the Mn–Zn ferrite NPs (7 ± 1 nm) was smaller than that of the nMag (11.82 nm) prepared under the same conditions, and the Mn–Zn ferrite compositions have a higher positive magnetic susceptibility.…”