Crosslinked N-vinylpyrrolidone polymers for use in subterranean formations and wells
Crosslinked polymers that may be useful, for example, as viscosifiers or fluid-loss control additives for well treatment and servicing fluids are provided. In one embodiment, the methods comprise: providing a treatment fluid comprising a base fluid and a crosslinked polymer composition comprising at least one polymer that comprise at least one N-vinyl lactam monomeric unit, and at least one crosslinker selected from the group consisting of: an acrylamide-based crosslinker, an acrylate-based crosslinker, an ester-based crosslinker, an amide-based crosslinker, any derivative thereof, and any combination thereof; and introducing the treatment fluid into at least a portion of a wellbore penetrating at least a portion of a subterranean formation.
1. A method comprising:
providing a drilling fluid that comprises a halide-based brine base fluid and a crosslinked polymer composition comprising
at least one homopolymer that comprises at least one N-vinyl lactam monomeric unit,
and
at least one crosslinker selected from the group consisting of: an acrylamide-based crosslinker, an acrylate-based crosslinker, an ester-based crosslinker, an amide-based crosslinker, any derivative thereof, and any combination thereof; and
using the drilling fluid to drill at least a portion of a well bore penetrating at least a portion of a subterranean formation.
2. The method of claim 1 wherein the crosslinker comprises an acrylamide-based crosslinker.
3. The method of claim 1 wherein the homopolymer comprises polyvinylpyrrolidone.
4. The method of claim 1 wherein the halide based brine base fluid has a density of from about 9 lb/gal to about 19.2 lb/gal.
5. The method of claim 1 wherein the halide based brine base fluid has a density of greater than 13 lb/gal.
6. A method comprising:
providing a drilling fluid that comprises a divalent brine base fluid and a crosslinked polymer composition comprising
at least one homopolymer that comprises at least one N-vinyl lactam monomeric unit,
and
at least one crosslinker selected from the group consisting of: an acrylamide-based crosslinker, an acrylate-based crosslinker, an ester-based crosslinker, an amide-based crosslinker, any derivative thereof, and any combination thereof; and
using the drilling fluid to drill at least a portion of a well bore penetrating at least a portion of a subterranean formation.
7. The method of claim 6 wherein the crosslinker comprises an acrylamide-based crosslinker.
8. The method of claim 6 wherein the homopolymer comprises polyvinylpyrrolidone.
9. The method of claim 6 wherein the divalent brine base fluid has a density of from about 9 lb/gal to about 19.2 lb/gal.
10. The method of claim 6 wherein the divalent brine base fluid has a density of greater than 13 lb/gal.
11. The method of claim 1 wherein a design temperature of the portion of the well bore is at least 149° C. (300° F.).