Abstract:
A new generation of organophosphorous scale inhibitors has been developed. Inhibitors are intended to prevent
the deposition of sulphate and carbonate salts in surface and downhole equipment during oil production,
treatment and transportation. The I type inhibitor (aminophosphonic acid) was synthesized through the
Moedritzer-Irani reaction of the condensation of 4.4'- (propane-2.2-diylbis(4.1-phenylene)bis(oxy)dianiline
(A diamine) with formaldehyde and phosphorous acid, the II type inhibitor by phosphorylation of glycolyzed
PET flex-(bis-hydroxyethyl terephthalate) with polyphosphoric acid. The structure of the developed
organophosphorus compounds was confirmed by IR spectroscopy. High inhibitory efficacy of the first and
second types of reagents for the deposition of carbonate and calcium sulphates was revealed. The morphology
of the solid sediments of mineral salts was studied by scanning electron microscopy (SEM). It is revealed that
the inhibition of crystal formation occurs at the stage of nucleation. Embedding in the surface of crystal nucleus,
the inhibitors prevent formation of crystalline phase in a solution and crystal growth.
