Mechanistic understanding of asphaltene precipitation and oil recovery enhancement using SiO 2 and CaCO 3 nano-inhibitors.

Autor: Shadervan A; Faculty of Chemical Engineering, Tarbiat Modares University, Tehran, Iran., Jafari A; Faculty of Chemical Engineering, Tarbiat Modares University, Tehran, Iran. ajafari@modares.ac.ir., Teimouri A; Faculty of Chemical Engineering, Tarbiat Modares University, Tehran, Iran., Gharibshahi R; Faculty of Chemical Engineering, Tarbiat Modares University, Tehran, Iran., Dehaghani AHS; Faculty of Chemical Engineering, Tarbiat Modares University, Tehran, Iran.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2024 Jul 02; Vol. 14 (1), pp. 15249. Date of Electronic Publication: 2024 Jul 02.
DOI: 10.1038/s41598-024-65995-1
Abstrakt: Asphaltene precipitation in oil reservoirs, well equipment, and pipelines reduces production, causing pore blockage, wettability changes, and decreased efficiency. Asphaltenes, with their unique chemical structure, self-assemble via acid-base interactions and hydrogen bonding. Nano-inhibitors prevent asphaltene aggregation at the nanoscale under reservoir conditions. This study investigates the effect of two surface-modified nanoparticles, silica, and calcium carbonate, as asphaltene inhibitors and oil production agents. The impacts of these nano-inhibitors on asphaltene content, onset point, wettability, surface tension, and oil recovery factor were determined to understand their mechanism on asphaltene precipitation and oil production. Results demonstrate that these nano-inhibitors can significantly postpone the onset point of asphaltene precipitation, with varying performance. Calcium carbonate nano-inhibitor exhibits better efficiency at low concentrations, suspending asphaltene molecules in crude oil. In contrast, silica nano-inhibitor performs better at high concentrations. Wettability alteration and IFT reduction tests reveal that each nano-inhibitor performs optimally at specific concentrations. Silica nano-inhibitors exhibit better colloidal stability and improve oil recovery more than calcium carbonate nano-inhibitors, with maximum oil recovery factors of 33% at 0.1 wt.% for silica and 25% at 0.01 wt.% for calcium carbonate nano-inhibitors.
(© 2024. The Author(s).)
Databáze: MEDLINE
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