Abstract

Sulphonated polymers are used in oilfield for scale inhibition. In this study, Al-sulphonated polycarboxylic acid (SPCA) hybrid nanoparticles were prepared by an environmentally friendly approach. Particle size of these materials was controlled at about 80 nm by applying hydrothermal synthetic method with urea as slow neutralization agent. Reaction parameters such as concentration of salt solution, reaction time, urea concentration and ionic strength were investigated to optimize nanoparticle synthesis. The mobility of Al-SPCA hybrid nanoparticles decreases dramatically in 1% (w/w) KCl solution. Using phosphino-polycarboxylic acid (PPCA) as dispersant, nanoparticles were well suspended in 1% KCl solution. Absorption of PPCA to hybrid nanoparticles increases its negative surface charge and decreases particle deposition. The retention and long term flowback performance of hybrid nanoparticles were compared with the neat chemical squeeze simulation in ground core column experiments. The results showed that the slow release of sulphonated polymer from hybrid nanoparticles in porous medium leads to an enhanced squeeze treatment efficiency and successful inhibitor treatment in the oil field.

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