Drag-reducing copolymer compositions
View Patent ↗A drag-reducing additive includes 40-85% by weight of a polymer emulsion that includes a polymer, a first surfactant, and a first solvent; 10-35% by weight of a second surfactant with an HLB greater than 8; and 5-30% by weight of a second solvent. In a preferred embodiment, the second solvent includes a terpene. In another preferred embodiment, the polymer is a copolymer that includes acrylamide and acrylic acid.
1. A well treatment composition for reducing drag in a well, pipeline, or gathering line, the well treatment composition comprising:
a drag reducing additive, the drag reducing additive comprising:
40-85% by weight of a polymer emulsion, wherein the polymer emulsion comprises a polymer, a first surfactant, and a first solvent;
10-35% by weight of a second surfactant with an HLB greater than 8; and
5-30% by weight of a second solvent; and
a well treatment fluid.
2. The well treatment composition of claim 1 , wherein the polymer is a copolymer that comprises acrylamide and acrylic acid.
3. The well treatment composition of claim 2 , wherein the copolymer comprises 60-99% by weight acrylamide and 1-40% by weight acrylic acid.
4. The well treatment composition of claim 1 , wherein the copolymer comprises polyacrylamide and a monomer selected from the group consisting of sodium acrylate, methyacrylamidopropyltrimethylammonium chloride, diallyldimethylammonium chloride, and dimethylaminoethylacrylate methyl chloride quaternary salt.
5. The well treatment composition of claim 1 , wherein the polymer is a water-soluble homopolymer.
6. The well treatment composition of claim 1 , wherein the second solvent comprises a terpene.
7. The well treatment composition of claim 1 , wherein the second solvent comprises d-limonene.
8. The well treatment composition of claim 1 , wherein the second solvent is selected from the group consisting of citrus, pine, eucalyptus, and mint-derived terpenes.
9. The well treatment composition of claim 1 , wherein the second surfactant is selected from the group consisting of ethoxylated alcohols, ethoxylated castor oils, and ethoxylated sorbitan monooleates.
10. A well treatment composition for reducing drag in a well, pipeline, or gathering line, the well treatment composition comprising:
from about 0.001% to about 4.7% by volume of a drag reducing additive, the drag reducing additive comprising:
50-99% by weight of a drag-reducing polymer; and
1-50% by weight of a surfactant with an HLB greater than 7; and
from about 99.999% to about 95.3% by volume of a well treatment fluid, wherein the well treatment fluid is a fracturing fluid.
11. The well treatment composition of claim 10 , wherein the drag-reducing polymer comprises:
about 72-99% of the drag-reducing polymer;
about 1-28% of the surfactant with an HLB greater than 7; and
wherein the drag-reducing additive is a highly viscous, paste-like material.
12. The well treatment composition of claim 11 , wherein the drag-reducing polymer is a copolymer that comprises acrylamide and acrylic acid.
13. The well treatment composition of claim 11 , wherein the drag-reducing polymer is a copolymer that comprises 60-99% by weight acrylamide and 1-40% by weight acrylic acid.
14. The well treatment composition of claim 11 , wherein the drag-reducing polymer is a copolymer that comprises acrylamide and a monomer selected from the group consisting of sodium acrylate, methyacrylamidopropyltrimethylammonium chloride, diallyldimethylammonium chloride, and dimethylaminoethylacrylate methyl chloride quaternary salt.
15. The well treatment composition of claim 11 , further comprising 1 to 35% of a second solvent.
16. The well treatment composition of claim 15 , wherein the second solvent comprises d-limonene.
17. The well treatment composition of claim 15 , wherein the second solvent is selected from the group consisting of citrus, pine, eucalyptus, and mint-derived terpenes.
18. The well treatment composition of claim 15 , wherein the surfactant is selected from the group consisting of ethoxylated alcohols, ethoxylated castor oils, and ethoxylated sorbitan monooleates.