Claims
- 1. A universal additive for improving the properties of a cement slurry to be utilized for cementing a well comprising:
- ferrous chloride, ferric chloride or mixtures thereof present in an amount in the range of from about 0.5 to about 30 parts by weight;
- an alkali or alkaline-earth metal halide present in an amount in the range of from about 5 to about 60 parts by weight;
- an organic acid which controls viscosity of the cement slurry present in an amount in the range of from about 0.01 to about 10 parts by weight; and
- a hydratable polymer which increases viscosity of the cement slurry present in an amount in the range of from about 1 to about 50 parts by weight.
- 2. The additive of claim 1 wherein said alkali or alkaline-earth metal halide is calcium chloride, sodium chloride, potassium chloride or ammonium chloride.
- 3. The additive of claim 1 wherein said organic acid is tartaric acid, citric acid, gluconic acid, oleic acid, phosphoric acid or uric acid.
- 4. The additive of claim 1 wherein said hydratable polymer is carboxymethylcellulose, hydroxyethylcellulose, carboxymethylhydroxyethylcellulose, or vinyl sulfonate polymers.
- 5. The additive of claim 1 which further comprises a polydimethylsiloxane defoaming agent present in said additive in an amount in the range of from about 0.01 to about 5 parts by weight.
- 6. The additive of claim 1 which further comprises a dispersing agent comprised of a condensation polymer product of an aliphatic ketone, an aliphatic aldehyde and a compound which introduces acid groups into the condensation polymer present in said additive in an amount in the range of from about 1 to about 20 parts by weight.
- 7. The additive of claim 1 which further comprises an ultra-fine particulate hydraulic cement having a maximum particle size of about 15 microns and a specific surface of about 12,000 square centimeters per gram present in said additive in an amount in the range of from about 1 to about 50 parts by weight.
- 8. The additive of claim 1 which further comprises a particulate ASTM Type III cement present in said additive in an amount in the range of from about 1 to about 50 parts by weight.
- 9. The additive of claim 1 which further comprises particulate silica present in said additive in an amount in the range of from about 1 to about 50 parts by weight.
- 10. The additive of claim 1 wherein said hydratable polymer comprises a hydratable graft polymer.
- 11. A universal particulate solid additive for improving the properties of a cement slurry to be utilized for cementing a well comprising:
- ferrous chloride, ferric chloride or mixtures thereof present in an amount of about 10 parts by weight;
- calcium chloride present in an amount of about 14 parts by weight;
- tartaric acid present in an amount of about 0.3 parts by weight;
- hydroxyethylcellulose present in an amount of about 12 parts by weight;
- polydimethylsiloxane present in an amount of about 0.3 parts by weight;
- a condensation polymer product of acetone, formaldehyde and sodium sulfite present in an amount of about 11 parts by weight;
- a particulate ultra-fine hydraulic cement having a maximum particle size of about 15 microns and a specific surface of about 12,000 square centimeters per gram present in an amount of about 8 parts by weight;
- a particulate ASTM Type III cement present in an amount of about 8 parts by weight; and
- fumed silica present in an amount of about 8 parts by weight.
- 12. A method of preparing a cement slurry which comprises:
- combining a universal additive with said cement slurry in an amount in the range of from about 0.1% to about 30% by weight of hydraulic cement in said slurry, said additive including ferrous chloride, ferric chloride or mixtures thereof present in an amount in the range of from about 0.5 to about 30 parts by weight, an alkali or alkaline-earth metal halide present in an amount in the range of from about 5 to about 60 parts by weight, an organic acid which controls viscosity of the cement slurry present in an amount in the range of from about 0.01 to about 10 parts by weight and a hydratable polymer which increases viscosity of the cement slurry present in an amount in the range of from about 1 to about 50 parts by weight.
- 13. The method of claim 12 wherein said alkaline-earth metal halide in said additive is calcium chloride, sodium chloride, potassium chloride or ammonium chloride.
- 14. The method of claim 12 wherein said organic acid in said additive is tartaric acid, citric acid, gluconic acid, oleic acid, phosphoric acid or uric acid.
- 15. The method of claim 12 wherein said hydratable polymer in said additive is carboxymethylcellulose, hydroxyethylcellulose, carboxymethylhydroxyethylcellulose, or vinyl sulfonate polymers.
- 16. The method of claim 12 wherein said additive further includes a defoaming agent comprised of polydimethylsiloxane present in said additive in an amount in the range of from about 0.01 to about 5 parts by weight.
- 17. The method of claim 12 wherein said additive further includes a dispersing agent comprised of a condensation polymer product of an aliphatic ketone, an aliphatic aldehyde and a compound which introduces acid groups into the condensation polymer present in said additive in an amount in the range of from about 1 to about 20 parts by weight.
- 18. The method of claim 12 wherein said additive further includes an ultra-fine particulate hydraulic cement having a maximum particle size of about 15 microns and a specific surface of about 12,000 square centimeters per gram present in said additive in an amount in the range of from about 1 to about 50 by weight.
- 19. The method of claim 12 wherein said additive further includes an ASTM Type III particulate cement present in said additive in an amount in the range of from about 1 to about 50 parts by weight.
- 20. The method of claim 12 wherein said additive further includes particulate silica present in said additive in an amount in the range of from about 1 to about 50 parts by weight.
- 21. The method of claim 12 wherein said hydratable polymer comprises a hydratable graft polymer.
- 22. A method of cementing a subterranean zone penetrated by a well bore at a temperature up to about 230.degree. F. utilizing a cement slurry comprised of a surface construction grade or better hydraulic cement and water having a density in the range of from about 12 to about 17 pounds per gallon comprising the steps of:
- (a) combining a universal additive with said cement slurry in an amount in the range of from about 0.1% to about 30% by weight of said hydraulic cement in said slurry, said additive including ferrous chloride, ferric chloride or mixtures thereof present in an amount in the range of from about 0.5 to about 30 parts by weight, an alkali or alkaline-earth metal halide present in an amount in the range of from about 5 to about 60 parts by weight, an organic acid which controls viscosity of the cement slurry present in an amount in the range of from about 0.01 to about 10 parts by weight and a hydratable polymer which increases viscosity of the cement slurry present in an amount in the range of from about 1 to about 50 parts by weight;
- (b) pumping the cement slurry containing said additive formed in step (a) into said subterranean zone by way of said well bore; and
- (c) allowing said cement slurry to set into a hard impermeable mass in said zone.
- 23. The method of claim 22 wherein said alkaline-earth metal halide in said additive is calcium chloride, sodium chloride, potassium chloride or ammonium chloride.
- 24. The method of claim 22 wherein said organic acid in said additive is tartaric acid, citric acid, gluconic acid, oleic acid, phosphoric acid or uric acid.
- 25. The method of claim 22 wherein said hydratable polymer in said additive is carboxymethylcellulose, hydroxyethylcellulose, carboxymethylhydroxyethylcellulose, or vinyl sulfonate polymers.
- 26. The method of claim 22 wherein said additive further includes a defoaming agent comprised of polydimethylsiloxane present in said additive in an amount in the range of from about 0.01 to about 5 parts by weight.
- 27. The method of claim 22 wherein said additive further includes a dispersing agent comprised of a condensation polymer product of an aliphatic ketone, an aliphatic aldehyde and a compound which introduces acid groups into the condensation polymer present in said additive in an amount in the range of from about 1 to about 20 parts by weight.
- 28. The method of claim 22 wherein said additive further includes an ultra-fine particulate hydraulic cement having a maximum particle size of about 15 microns and a specific surface of about 12,000 square centimeters per gram present in said additive in an amount in the range of from about 1 to about 50 by weight.
- 29. The method of claim 22 wherein said additive further includes an ASTM Type III particulate cement present in said additive in an amount in the range of from about 1 to about 50 parts by weight.
- 30. The method of claim 22 wherein said additive further includes particulate silica present in said additive in an amount in the range of from about 1 to about 50 parts by weight.
RELATED PATENT APPLICATION DATA
This application is a continuation-in-part of application Ser. No. 08/834,065 filed Apr. 14, 1997, now U.S. Pat. No. 5,749,418.
US Referenced Citations (15)
Foreign Referenced Citations (3)
Number |
Date |
Country |
53-012929 |
Jul 1976 |
JPX |
0814927 |
Mar 1979 |
SUX |
785463 |
Dec 1980 |
SUX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
834065 |
Apr 1997 |
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