Patent ID: 8372786
Filing Date: 2013-02-12
Classification: C09K,Y10S

Abstract:
1. A method for controlling or delaying the release of an oil and gas field chemical comprising: providing a polyelectrolyte complex comprising a polyanion and a polycation, said polyelectrolyte complex having a polymeric core and polymeric shell, said polyelectrolyte complex associated with said oil and gas field chemical; and wherein said polyelectrolyte complex is a nanoparticle having a particle size less than about 5000 nm; wherein said oil and gas field chemical is selected from the group consisting of a scale inhibitor; and wherein said scale inhibitor is selected from the group consisting of aliphatic phosphonic acids, aminoalkyl phosphonic acids, polycarboxylic acids selected from the group consisting of acrylic acid, maleic acid, lactic acid and tartaric acids, and polymeric anionic compounds; polyvinyl sulphonic acid and poly(meth)acrylic acids; hexamethylene diamine tetrakis (methylene phosphonic acid), diethylene triamine tetra (methylene phosphonic acid), diethylene triamine penta (methylene phosphonic acid), bis-hexamethylene triamine pentakis (methylene phosphonic acid), polyacrylic acid, phosphino carboxylic acid, diglycol amine phosphonate, 1-hydroxyethylidene 1,1-diphosphonate, and bisaminoethylether phosphonate; and their alkali metal salts; introducing said polyelectrolyte complex associated with said oil and gas field chemical into an oil and gas well.