Drag reducing compositions and methods of manufacture and use
View Patent ↗A drag reducing composition and method of use wherein the drag reducing composition comprises a polyolefin, drag reducing polymer, a carrier or suspending medium, and a polycarboxylate dispersion agent.
1. An aqueous drag reducing composition comprising:
from about 10%-45% of a finely divided solid polyolefin, friction reducing agent formed from monoolefins containing from 2 to 30 carbon atoms;
0.1-5% by weight of a hydrophobic polyelectrolyte dispersion agent comprising a polycarboxylate having a general formula;
wherein R 1 and R 2 are independently H + or methyl,
wherein R 3 is an alkyl group having from 1 to 3 carbon atoms,
wherein x and y are integers which can be the same or different, the sum of x and y being from 10 to 700, and
wherein M + is an ammonium ion; and
an aqueous suspending medium.
2. The composition of claim 1 , wherein said friction reducing agent is present in an amount of from about 30-41% by weight.
3. The composition of claim 1 , wherein said polyolefin friction reducing agent is produced by a solution polymerization.
4. The composition of claim 1 , wherein said polyolefin friction reducing agent is produced by bulk polymerization.
5. The composition of claim 1 , further comprising:
from about 0.1-25% by weight of a coating agent.
6. The composition of claim 5 , wherein said coating agent comprises a wax.
7. The composition of claim 6 , wherein said wax is a hydrocarbon wax.
8. The composition of claim 5 , wherein said coating agent comprises a metallic salt of a fatty acid.
9. The composition of claim 1 , further comprising:
a freeze point depressant in an amount of between 0 and 20% by weight of the composition.
10. The composition of claim 9 , wherein said freeze point depressant is selected from the group consisting of alcohols and glycols containing from 1 to 14 carbon atoms.
11. The composition of claim 1 , further comprising:
an effective amount of a biocide.
12. The composition of claim 1 , wherein R 1 and R 2 are hydrogen, M is an ammonium ion, and R 3 is methyl.
13. The composition of claim 1 , wherein said dispersion agent has a pH of from about 6.0 to about 8.5.
14. A method of reducing drag in a flowing hydrocarbon stream comprising introducing into said stream an effective amount of the drag reducing composition of claim 1 .
15. The composition of claim 1 , wherein said composition is free of anti-foaming agents.