Claims
- 1. A well treatment fluid composition, comprising a carrier fluid, a viscosifying agent, an amphoteric surfactant, and proppant, wherein the surfactant comprises an alkyl-aminocarboxylic acid or carboxylate.
- 2. The composition of claim 1, wherein the composition is a foam that comprises a gas selected from the group consisting of nitrogen, air, and carbon dioxide.
- 3. The composition of claim 1, wherein the surfactant has the formula R—NH2—(CH2)n—C(O)OX wherein R is a saturated or unsaturated alkyl group having from 6-20 carbon atoms, n is from 2-6, and X is hydrogen or a salt forming cation.
- 4. The composition of claim 3, wherein n is from 2-4.
- 5. The composition of claim 3, wherein R is a saturated or unsaturated alkyl group having from 10-14 carbon atoms.
- 6. The composition of claim 1, wherein the surfactant comprises an alkyl-aminopropionic acid or propionate.
- 7. The composition of claim 1, wherein the surfactant is a coco-aminopropionate.
- 8. The composition of claim 1, wherein the viscosifying agent is a solvatable, crosslinkable polymer selected from the group consisting of guar, hydroxypropyl guar, carboxymethyl guar, carboxymethylhydroxypropyl guar, hydroxyethyl cellulose, carboxymethylhydroxyethyl cellulose, hydroxypropyl cellulose, xanthan, and mixtures thereof.
- 9. The composition of claim 8, further comprising a crosslinking agent.
- 10. The composition of claim 8, further comprising a gel breaker for the viscosifying agent.
- 11. The composition of claim 10, further comprising a breaker aid.
- 12. The composition of claim 1, further comprising an additive that decreases the frictional pressure involved in pumping the fluid composition through well tubing.
- 13. The composition of claim 12, wherein the additive comprises at least one polyacrylamide.
- 14. A well treatment fluid composition, comprising a carrier fluid; a viscosifying agent selected from the group consisting of guar, hydroxypropyl guar, carboxymethyl guar, carboxymethylhydroxypropyl guar, hydroxyethyl cellulose, carboxymethylhydroxyethyl cellulose, hydroxypropyl cellulose, xanthan, and mixtures thereof; a coco-aminopropionate surfactant; and proppant.
- 15. A method of hydraulically fracturing a subterranean coal bed, comprising the step of injecting a well treatment fluid composition via a wellbore into a subterranean coal bed at a flow rate and pressure sufficient to hydraulically fracture the formation, wherein the well treatment fluid composition comprises a carrier fluid and an amphoteric surfactant.
- 16. The method of claim 15, wherein the well treatment fluid further comprises proppant.
- 17. The method of claim 15, wherein the well treatment fluid further comprises a viscosifying agent.
- 18. The method of claim 15, wherein the composition is a foam that comprises a gas selected from the group consisting of nitrogen, air, and carbon dioxide.
- 19. The method of claim 15, further comprising injecting carbon dioxide via the wellbore into the subterranean bed prior to injecting the well treatment fluid composition.
- 20. The method of claim 15, wherein the surfactant comprises an alkyl-aminocarboxylic acid or carboxylate.
- 21. The method of claim 15, wherein the surfactant has the formula RNH2(CH2)nC(O)OX wherein R is a saturated or unsaturated alkyl group having from 6-20 carbon atoms, n is from 2-6, and X is hydrogen or a salt forming cation.
- 22. The method of claim 21, wherein n is from 2-4.
- 23. The method of claim 21, wherein R is a saturated or unsaturated alkyl group having from 10-14 carbon atoms.
- 24. The method of claim 15, wherein the surfactant comprises an alkyl-aminopropionic acid or propionate.
- 25. The method of claim 15, wherein the surfactant is a coco-aminopropionate.
- 26. The method of claim 17, wherein the viscosifying agent is a solvatable, crosslinkable polymer selected from the group consisting of guar, hydroxypropyl guar, carboxymethyl guar, carboxymethylhydroxypropyl guar, hydroxyethyl cellulose, carboxymethylhydroxyethyl cellulose, hydroxypropyl cellulose, xanthan, and mixtures thereof.
- 27. The method of claim 26, further comprising a crosslinking agent.
- 28. The method of claim 27, further comprising a gel breaker for the viscosifying agent.
- 29. The method of claim 28, further comprising a breaker aid.
- 30. The method of claim 15, further comprising an additive that decreases the frictional pressure involved in pumping the fluid composition through well tubing.
- 31. The method of claim 30, wherein the additive comprises at least one polyacrylamide.
CROSS REFERENCE TO RELATED APPLICATION
[0001] This application is a Continuation-In-Part of Ser. No. 09/513,429 that was filed on Feb. 25, 2000.
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
09513429 |
Feb 2000 |
US |
Child |
09969392 |
Oct 2001 |
US |