Foamed cement slurries, additives and methods
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
E21B-033/13
E21B-033/138
출원번호
US-0899325
(2004-07-26)
발명자
/ 주소
Chatterji,Jiten
Brenneis,D. Chad
King,Bobby J.
Cromwell,Roger S.
Gray,Dennis W.
출원인 / 주소
Halliburton Energy Services, Inc.
대리인 / 주소
Baker Botts L.L.P.
인용정보
피인용 횟수 :
17인용 특허 :
41
초록▼
The present invention relates to foamed cement slurries, additives and methods. A foamed cement slurry of the invention comprises a hydraulic cement, sufficient water to form a slurry, sufficient gas to form a foam and an environmentally benign foaming and stabilizing additive comprising a mixture o
The present invention relates to foamed cement slurries, additives and methods. A foamed cement slurry of the invention comprises a hydraulic cement, sufficient water to form a slurry, sufficient gas to form a foam and an environmentally benign foaming and stabilizing additive comprising a mixture of an ammonium salt of an alkyl ether sulfate surfactant, a cocoamidopropyl betaine surfactant, a cocoamidopropyl dimethylamine oxide surfactant, sodium chloride and water.
대표청구항▼
What is claimed is: 1. A method of cementing comprising the steps of: providing a foamed cement slurry comprising a hydraulic cement, water, a gas, and a foaming and stabilizing additive comprising a mixture of an ammonium salt of an alkyl ether sulfate surfactant, cocoamidopropyl betaine surfactan
What is claimed is: 1. A method of cementing comprising the steps of: providing a foamed cement slurry comprising a hydraulic cement, water, a gas, and a foaming and stabilizing additive comprising a mixture of an ammonium salt of an alkyl ether sulfate surfactant, cocoamidopropyl betaine surfactant, cocoamidopropyl dimethylamine oxide surfactant, sodium chloride and water, wherein the ammonium salt of the alkyl ether sulfate surfactant comprises a mixture of an ammonium salt of a C6-10 alkyl ether sulfate surfactant, an ammonium salt of a C4 alkyl ether sulfate surfactant, and an ammonium sulfate; placing the foamed cement slurry in a location to be cemented; and allowing the cement slurry to set. 2. The method of claim 1 wherein the hydraulic cement comprises at least one of the following: a Portland cement, a slag cement, a silica cement, a pozzolana cement or an aluminous cement. 3. The method of claim 1 wherein the water comprises at least one of the following: fresh water, an unsaturated salt solution or a saturated salt solution. 4. The method of claim 1 wherein the water in the foamed cement slurry is present in an amount in the range of from about 35% to about 70% by weight of hydraulic cement therein. 5. The method of claim 1 wherein the gas comprises at least one of the following: air or nitrogen. 6. The method of claim 1 wherein the gas in the foamed cement slurry is present in the range of from about 10% to about 80% by volume of the cement slurry. 7. The method of claim 1 wherein the mixture that comprises the ammonium salt of the alkyl ether sulfate surfactant comprises 29.36% by weight of the ammonium salt of the C6-10 alkyl ether sulfate surfactant containing 1.8 moles of ethylene oxide, 9.79% by weight of the ammonium salt of the C4 alkyl ether sulfate surfactant containing 2 moles of ethylene oxide, and 0.40% by weight of the ammonium sulfate. 8. The method of claim 1 wherein the cocoamidopropyl betaine surfactant in the foaming and stabilizing additive is present in an amount of about 9.46% by weight of the additive. 9. The method of claim 1 wherein the cocoamidopropyl dimethylamine oxide surfactant in the foaming and stabilizing additive is present in an amount of about 1.39% by weight of the additive. 10. The method of claim 1 wherein the sodium chloride in the foaming and stabilizing additive is present in an amount of about 8.89% by weight of the additive. 11. The method of claim 1 wherein the water in the foaming and stabilizing additive is present in an amount of about 40.71% by weight of the additive. 12. The method of claim 1 wherein the foaming and stabilizing additive in the foamed cement slurry is present in an amount in the range of from about 0.8% to about 10% by volume of the water in the foamed cement slurry. 13. The method of claim 1 wherein the location to be cemented is above ground, below ground or in a well. 14. A method of cementing a subterranean zone penetrated by a well bore comprising the steps of: providing a foamed cement slurry comprising a hydraulic cement, water, a gas, and a foaming and stabilizing additive comprising a mixture of an ammonium salt of an alkyl ether sulfate surfactant, cocoamidopropyl betaine surfactant, cocoamidopropyl dimethylamine oxide surfactant, sodium chloride and water, wherein the ammonium salt of the alkyl ether sulfate surfactant comprises a mixture of an ammonium salt of a C6-10 alkyl ether sulfate surfactant, an ammonium salt of a C4 alkyl ether sulfate surfactant, and an ammonium sulfate; placing the foamed cement slurry in the subterranean zone by way of the well bore; and allowing the foamed cement slurry to set into a hard impermeable mass. 15. The method of claim 14 wherein the hydraulic cement comprises at least one of the following: a Portland cement, a slag cement, a silica cement, a pozzolana cement or an aluminous cement. 16. The method of claim 14 wherein the water comprises at least one of the following: fresh water, an unsaturated salt solution or a saturated salt solution. 17. The method of claim 14 wherein the water in the foamed cement slurry is present in an amount in the range of from about 35% to about 70% by weight of hydraulic cement therein. 18. The method of claim 14 wherein the gas comprises at least one of the following: air or nitrogen. 19. The method of claim 14 wherein the gas in the foamed cement slurry is present in the range of from about 10% to about 80% by volume of the cement slurry. 20. The method of claim 14 wherein the mixture that comprises the ammonium salt of the alkyl ether sulfate comprises 29.36% by weight of the ammonium salt of the C6-10 alkyl ether sulfate surfactant containing 1.8 moles of ethylene oxide, 9.79% by weight of an ammonium salt of a C4 alkyl ether sulfate surfactant containing 2 moles of ethylene oxide, and 0.40% by weight of the ammonium sulfate. 21. The method of claim 14 wherein the cocoamidopropyl betaine surfactant in the foaming and stabilizing additive is present in an amount of about 9.46% by weight of the additive. 22. The method of claim 14 wherein the cocoamidopropyl dimethylamine oxide surfactant in the foaming and stabilizing additive is present in an amount of about 1.39% by weight of the additive. 23. The method of claim 14 wherein the sodium chloride in the foaming and stabilizing additive is present in an amount of about 8.89% by weight of the additive. 24. The method of claim 14 wherein the water in the foaming and stabilizing additive is present in an amount of about 40.71% by weight of the additive. 25. The method of claim 14 wherein the foaming and stabilizing additive in the foamed cement slurry is present in an amount in the range of from about 0.8% to about 10% by volume of the water in the foamed cement slurry.
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