Drag reducing copolymers for cold fluid applications
View Patent ↗Drag reducing compositions comprising polymer particles, where the polymer particles include copolymers comprising the residues of at least one methacrylate monomer and at least one comonomer having a polymerizable vinyl group, where the comonomer has no more than one pendant substituent per vinyl carbon. The drag reducing compositions can have improved dissolution rates in hydrocarbon-containing fluids. The drag reducing compositions can be added to a hydrocarbon-containing fluid to decrease the pressure drop associated with the turbulent flow of the hydrocarbon-containing fluid through a conduit.
1. A mixture comprising a drag reducing composition and a hydrocarbon-containing fluid comprising: a continuous phase and a plurality of drag reducing polymer particles, wherein at least a portion of said polymer particles comprise copolymers containing from about 40 wt % to about 95 wt % of at least one methacrylate monomer and at least from about 5 wt % to about 60 wt % of one comonomer, wherein said comonomer comprises a polymerizable vinyl group having no more than one pendant substituent per vinyl carbon, and
a hydrocarbon-containing fluid, wherein said drag reducing composition reduces the pressure drop associated with the turbulent flow of a said hydrocarbon containing fluid through a conduit and wherein said hydrocarbon containing fluid has an average temperature of 25° C. or less.
2. The composition of claim 1 , wherein said copolymers comprise saturated hydrocarbon backbones comprising a plurality of carbon atoms, wherein fewer than 50 percent of said carbon atoms have more than one pendant substituent.
3. The composition of claim 1 , wherein said copolymers comprise saturated hydrocarbon backbones comprising a plurality of carbon atoms, wherein fewer than 45 percent of said carbon atoms have more than one pendant substituent.
4. The composition of claim 1 , wherein said methacrylate monomer has the following structure:
wherein R 1 is a C 1 to C 20 alkyl, isoalkyl, cycloalkyl, aryl, or aryl-substituted alkyl.
5. The composition of claim 1 , wherein said methacrylate monomer comprises C 4 -C 20 alkyl, C 6 -C 20 substituted or unsubstituted aryl, or aryl-substituted C 1 -C 10 alkyl esters of methacrylic acid.
6. The composition of claim 1 , wherein said methacrylate monomer comprises 2-ethylhexyl methacrylate.
7. The composition of claim 1 , wherein said comonomer is selected from the group consisting of n-butyl acrylate; 2-ethylhexyl acrylate; 3,5,5-trimethylhexyl acrylate; tert-butyl acrylate; 2-phenylethyl acrylate; iso-butyl acrylate; isobornyl acrylate; n-hexyl acrylate; sec-butyl acrylate; ethyl acrylate; and lauryl acrylate.
8. The composition of claim 1 , wherein said comonomer comprises n-butyl acrylate.
9. The composition of claim 1 , wherein said copolymers comprise said comonomer in an amount in the range of from about 1 to about 90 weight percent based on the total weight of the copolymer.
10. The composition of claim 1 , wherein said copolymers said comonomer in an amount in the range of from about 3 to about 80 weight percent based on the total weight of the copolymer.
11. The composition of claim 1 , wherein said copolymers comprise said methacrylate monomer in an amount in the range of from about 10 to about 99 weight percent based on the total weight of the copolymer.
12. The composition of claim 1 , wherein said polymer particles have a hydrocarbon dissolution rate constant of at least about 0.01 min −1 at 20° C. in a mixture of kerosene and isopropyl alcohol (“IPA”) in a volume ratio of 95:5 kerosene:IPA.
13. The composition of claim 1 , wherein said continuous phase comprises water, one or more alcohols, and/or one or more polyols.
14. The composition of claim 1 , wherein said drag reducing composition comprises said polymer particles in an amount in the range of from about 10 to about 60 weight percent based on the total weight of said drag reducing composition.
15. The composition of claim 1 , wherein said polymer particles have a weight average molecular weight of at least 1×10 6 g/mol.
16. The composition of claim 1 , wherein said drag reducing composition comprises an emulsion drag reducing polymer wherein said polymer particles have an average particle size in the range of from about 10 to about 500 nm.
17. The composition of claim 1 , wherein said drag reducing composition comprises a suspension drag reducing polymer wherein said polymer particles have an average particle size in the range of from about 1 to about 500 micrometers.