Branched Phosphonated Polyetheramine-Coated Magnetic Nanoparticles for Enhanced Oilfield Scale Management

Inorganic scaling remains a significant challenge in hydrocarbon production, necessitating the development of more efficient and environmentally compliant solutions. Recently, we investigated magnetic nanoparticles coated with organophosphorus compounds as a sustainable strategy for mitigating scale deposition. However, these magnetic nanoparticles coated with partially phosphonated linear polyetheramine exhibited limited inhibition performance, particularly against harsh scales such as calcium carbonate and barium sulfate. In this study, we successfully synthesized two magnetic nanocomposites without the use of linkers: Superparamagnetic Iron Oxide Nanoparticles coated with Phosphonated Linear Polyetheramine-176 (SPIONs-PLPEA-176) and Superparamagnetic Iron Oxide Nanoparticles coated with Phosphonated Branched Polyetheramine-403 (SPIONs-PBPEA-403). The synthesized nanocomposites were fully characterized using various spectroscopic and analytical techniques. Their scale inhibition performance was evaluated under dynamic conditions against calcite and barite scales using high-pressure dynamic tube-blocking tests at 80 bar and 100 °C. The results demonstrated that SPIONs-PBPEA-403 exhibited superior scale inhibition efficiency for both calcite and barite scales compared to SPIONs-PLPEA-176, highlighting its potential as an effective and recoverable scale inhibitor for oilfield applications.