C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 8/32 (2006.01) C09K 8/28 (2006.01) C09K 8/36 (2006.01) C09K 8/72 (2006.01)
Patent
CA 2352104
The present invention relates to polyelectrolytes which have been modified so as to be rendered hydrophobic by amidification of a hydrophilic backbone using n--alkylamines, the alkyl chains of which contain 6 to 22 carbon atoms. Amidification is preferably carried out using di-n-dodecylamine. The hydrophilic backbone is preferably a sodium polyacrylate or the corresponding polyacrylic acid or an acrylate-AMPS statistical copolymer. The polymers of the invention can be used to stabilize direct or reverse emulsions which are prone to being destabilized or reversed by modifying the degree of salinity of the aqueous phase or by modifying the pH. The invention is of particular application to petroleum or analogous drilling fluids, in particular drilling, fracturing, acidizing or completion fluids.
La présente invention a pour objet des polyélectrolytes modifiés hydrophobes par amidification d'un squelette hydrophile par des n-alkylamines dont les chaînes alkyl comportent de 6 à 22 atomes de carbone. De façon préférée, l'amidification est obtenue par de la di-n-dodécylamine. Le squelette hydrophile est de préférence un polyacrylate de sodium ou l'acide polyacrylique correspondant ou un copolymère statistique d'acrylate-AMPS. Les polymères selon l'invention peuvent être utilisés pour stabiliser des émulsions directes ou inverses susceptibles d'être déstabilisées ou inversées par une modification du degré de salinité de la phase aqueuse ou une modification du pH. L'invention s'applique notamment à la stabilisation de fluides de forages pétroliers ou analogues en particulier les fluides de forage, de fracturation, d'acidification ou de complétion.
Lafuma Francoise
Monfreux Nathalie
Perrin Patrick
Sawdon Christopher
Finlayson & Singlehurst
M-I L.l.c.
Schlumberger Canada Limited
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