초록 ▼

Methods and fluids are provided that include, but are not limited to, a drilling fluid comprising an aqueous base fluid and a fluid loss control additive that comprises at least one polymeric micro gel and a method comprising: providing an aqueous based treatment fluid comprising a fluid loss contro

Methods and fluids are provided that include, but are not limited to, a drilling fluid comprising an aqueous base fluid and a fluid loss control additive that comprises at least one polymeric micro gel and a method comprising: providing an aqueous based treatment fluid comprising a fluid loss control additive that comprises at least one polymeric micro gel; placing the aqueous based treatment fluid in a subterranean formation via a well bore penetrating the subterranean formation; allowing the fluid loss control additive to become incorporated into a filter cake located on a surface within the subterranean formation; allowing the filter cake to be degraded; and producing hydrocarbons from the formation. Additional methods are also provided.

대표청구항 ▼

1. A drilling fluid comprising an aqueous base fluid and a fluid loss control additive that comprises at least one at least partially spherical, non-fibrous polymeric micro gel that comprises a reaction product formed by a polymerization reaction of a polymer or copolymer and a crosslinking agent, w

1. A drilling fluid comprising an aqueous base fluid and a fluid loss control additive that comprises at least one at least partially spherical, non-fibrous polymeric micro gel that comprises a reaction product formed by a polymerization reaction of a polymer or copolymer and a crosslinking agent, wherein the polymer or copolymer comprises at least one unit based on at least one compound selected from the group consisting of polybutylene succinate, polybutylene succinate-co-adipate, polyhydroxybutyrate-valerate, polyhydroxybutyrate-covalerate, polyester amides, polyethylene terephthalates, sulfonated polyethylene terephthalate, aliphatic aromatic copolyester, chitins, chitosans, poly(hydroxy ester ethers), poly(hydroxybutyrates), poly(orthoesters), poly(phosphazenes), a copolymer thereof, a homopolymer thereof, a tetrapolymer thereof, and any derivative thereof, andwherein the aqueous base fluid is a high density brine with a density of at least about 9 lb/gal. 2. The drilling fluid of claim 1 wherein the fluid loss control additive is included in the drilling fluid in an amount greater than 0% and up to about 5% by weight of active component of the polymeric micro gel. 3. The drilling fluid of claim 1 wherein the polymer or copolymer further comprises at least one unit based on at least one compound selected from the group consisting of: acrylamides, vinylpyrrolidones, vinylpyridines, acrylates, polyacrylamides, polyvinylpyrrolidones, polyvinylpyridines, polyacrylates, polyacrylic acids, poly(ethylene oxides), poly(propylene oxides), poly(anhydrides), polyamides, polystyrenes, vinyl alcohols, polyvinyl alcohols, polyethylenes, polypropylenes, polysaccharides, aliphatic polyesters, polylactic acids, poly(glycolides), polycaprolactones, poly(ε-caprolactones), proteins, polycarbonates, poly(amino acids), a copolymer thereof, a homopolymer thereof, a tetrapolymer thereof, and any derivative thereof. 4. The drilling fluid of claim 1 wherein the crosslinking agent comprises at least one crosslinking agent selected from the group consisting of: diethylene glycol dimethacrylate, azobisisobutyronitrile, and 2,2′-azobis[2-(2-imidazolin-2-yl)propane]dihydrochloride. 5. The drilling fluid of claim 1 further comprising a bridging agent. 6. The drilling fluid of claim 5 wherein the bridging agent is selected from a group consisting of a self-degrading bridging agent and a degradable bridging agent. 7. A drilling fluid comprising: an aqueous base fluid anda fluid loss control additive that comprises at least one polymeric micro gel and a continuous medium,wherein the continuous medium comprises a fluid selected from the group consisting of a polyglycol amine, t-butanol, a mixture of t-butanol and water, and any combination thereof, and wherein the aqueous base fluid is a high density brine with a density of at least about 9 lb/gal. 8. The drilling fluid of claim 7 wherein the continuous medium further comprises a fluid selected from the group consisting of fresh water, sea water, salt water, brines, a glycerin, methanol, ethanol, n-propanol, isopropanol, n-butanol, sec-butanol, isobutanol, a polyol, a glycol, mixture of methanol and water, a mixture of ethanol and water, a mixture of n-propanol and water, a mixture of sodium chloride and water, a mixture of potassium chloride and water, a mixture of calcium chloride and water, a mixture of n-butanol and water, a mixture of sec-butanol and water, a mixture of isobutanol and water, and any combination thereof. 9. The drilling fluid of claim 7 wherein the polymeric micro gel comprises a reaction product formed by a polymerization reaction of a polymer or copolymer and a crosslinking agent. 10. The drilling fluid of claim 7 further comprising a bridging agent. 11. The drilling fluid of claim 7 wherein the drilling fluid does not comprise clay. 12. A drilling fluid comprising an aqueous base fluid and a fluid loss control additive that comprises at least one polymeric micro gel that comprises a reaction product formed by a polymerization reaction of a polymer or copolymer and a crosslinking agent, wherein the polymer or copolymer comprises at least one unit based on at least one compound selected from the group consisting of polybutylene succinate, polybutylene succinate-co-adipate, polyhydroxybutyrate-valerate, polyhydroxybutyrate-covalerate, polyester amides, polyethylene terephthalates, sulfonated polyethylene terephthalate, aliphatic aromatic copolyester, chitins, chitosans, poly(hydroxy ester ethers), poly(hydroxybutyrates), poly(orthoesters), poly(phosphazenes), a copolymer thereof, a homopolymer thereof, a tetrapolymer thereof, and any derivative thereof; andwherein the crosslinking agent comprises at least one crosslinking agent selected from the group consisting of azobisisobutyronitrile and 2,2′-azobis[2-(2-imidazolin-2-yl)propane]dihydrochloride; andwherein the aqueous base fluid is a high density brine with a density of at least about 9 lb/gal. 13. The drilling fluid of claim 12, wherein the polymeric micro gel has a size range of about 10 nm to about 500 nm. 14. The drilling fluid of claim 12, wherein the polymeric micro gel has a size range of about 500 nm to about 10 microns. 15. The drilling fluid of claim 12, wherein the polymeric micro gel has a size range of about 10 microns to about 500 microns.