Dispersing sulfide scales in oil and gas production systems

C - Chemistry – Metallurgy – 10 – G

Patent

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Details

C10G 75/04 (2006.01) C08F 20/60 (2006.01) C08F 226/04 (2006.01) C23F 15/00 (2006.01)

Patent

CA 2687233

A homopolymer of a monomer selected from those having the general formula: (I) wherein: R1 is H or CH3; R2 is H or an alkyl group having from 1 to about 4 carbon atoms; A is a straight or branched chain alkyl group having from 1 to 10 carbon atoms; and R5, R6, and R7 each are independently an alkyl group having from 1 to 6 carbon atoms; or a copolymer of such monomers as acrylate, acrylamide or methacrylamide may be used to disperse metal sulfides prior to their forming scales during the production and transportation of crude oil. Terpolymers of dimethyldiallylammonium salt, 2-hydroxypropyl acrylate; and acrylic acid may also be used for this purpose. The production fluid may also be treated with a compound that promotes the formation of dispersible sulfide scales.

La présente invention concerne un homopolymère à base d'un monomère choisi parmi les monomères de formule générale (I) dans laquelle R1 représente H ou CH3 ; R2 représente H ou un groupe alkyle comportant de 1 à environ 4 atomes de carbone ; A représente un groupe alkyle à chaîne linéaire ou ramifiée comportant de 1 à 10 atomes de carbone ; et R5, R6 et R7 représentent chacun indépendamment l'un de l'autre un groupe alkyle comportant de 1 à 6 atomes de carbone ; ou, encore, un copolymère à base de monomères tels que l'acrylate, l'acrylamide ou le méthacrylamide, pouvant être utilisé pour disperser des sulfures métalliques préalablement à la formation d'écailles par ceux-ci durant la production et le transport de pétrole brut. Des terpolymères de sel de diméthyldiallylammonium, d'acrylate de 2-hydroxypropyle ; et de l'acide acrylique peuvent également être utilisés à cet effet. Le fluide produit peut également être traité au moyen d'un composé favorisant la formation d'écailles de sulfure dispersibles.

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