Scale inhibitor testing of new organophosphoric compounds

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.