Thermosensitive core-shell fe3o4@poly(n-isopropylacrylamide) nanogels for enhanced oil recovery
Document Type
Article
Publication Date
7-27-2021
Abstract
An investigation on the application of thermosensitive core-shell Fe3O4@PNIPAM nanogels in enhanced oil recovery was successfully performed. Here, the unique core-shell architecture was fabricated by conducting the polymerization at the surface of 3-butenoic acid-functionalized Fe3O4 nanoparticles and characterized using X-ray diffraction (XRD), H-1 NMR, vibration sample magnetometer (VSM), and high-resolution transmission electron microscopy (HR-TEM). According to the results, this core-shell structure was beneficial for achieving the desired high viscosity and low nanofluid mobility ratio at high temperatures, which is essential for enhanced oil recovery (EOR) application. The results demonstrated that the nanogels exhibited a unique temperature-dependent flow behavior due to the PNIPAM shell's ability to transform from a hydrated to a dehydrated state above its low critical solution temperature (LCST). At such conditions, the nanogels exhibited a significantly low mobility ratio (M = 0.86), resulting in an even displacement front during EOR and leads to higher oil production. Based on the result obtained from sand pack flooding, about 25.75% of an additional secondary oil recovery could be produced when the nanofluid was injected at a temperature of 45 degrees C. However, a further increase in the flooding temperature could result in a slight reduction in oil recovery due to the precipitation of some of the severely aggregated nanogels at high temperatures.
Keywords
Wettability alteration, heavy oil, Interfacial-tension, Nanoparticles
Divisions
sch_che
Funders
Indonesian Ministry of Research and Technology/National Research and Innovation Agency through Hibah Penelitian Dasar Unggulan Dasar Perguruan Tinggi (PDUPT) 2021 [NKB-177/UN2.RST/HKP.05.00/2021]
Publication Title
Langmuir
Volume
37
Issue
29
Publisher
American Chemical Society
Publisher Location
1155 16TH ST, NW, WASHINGTON, DC 20036 USA