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US 11,441,066 B2Granted
Polymer dispersions for oilfield friction reduction
AssigneeSolvay USA Inc.
InventorsQing Wang, Genyao Lin, Zhihua Zhang, Fulya Sudur Zalluhoglu
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Abstract
A polymer dispersion includes a water-soluble copolymer prepared by controlled radical polymerization; a water soluble salt; a polyol; a salt selected from the group consisting of sodium citrate, sodium phosphate, sodium nitrate, and combinations thereof; and water. Methods for using the polymer dispersion for oilfield friction reduction occur under a variety of adverse conditions including low temperatures, salt, scale, and iron.
Claims9
A polymer dispersion comprising:
- a) 2 to 30 weight percentage of a water soluble copolymer;
- b) 10 to 50 weight percentage of a water soluble salt;
- c) 0 to 20 weight percentage of a polyol;
- d) a salt selected from the group consisting of sodium citrate, sodium phosphate, sodium nitrate, and combinations thereof;
- and
- e) water;
- weight percentages are based on total weight of the polymer dispersion;
- wherein said copolymer is obtained by a process comprising the steps of:
- (A) an ionic charged polymeric dispersant is prepared from at least an ionic monomer in the presence of a radical polymerization control agent to obtain a living polymer,
- (B), said living polymer is charged into an aqueous solution comprising a nonionic monomer, and optionally an ionic monomer, the aqueous solution is then subject to continuous polymerization to obtain said copolymer.
7 more elements
Dependencies are inferred from the claim text.