IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0435297
(2003-05-09)
|
등록번호 |
US-7441600
(2008-10-28)
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발명자
/ 주소 |
- Brothers,Lance E.
- Ravi,Krishna M.
- Palmer,Anthony V.
|
출원인 / 주소 |
- Halliburton Energy Services, Inc.
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
7 인용 특허 :
45 |
초록
▼
The present invention provides foamed cement compositions with improved mechanical properties and methods of cementing in subterranean formations, particularly in conjunction with subterranean well operations. The foamed cement compositions comprise carbon fibers, a hydraulic cement material, suffic
The present invention provides foamed cement compositions with improved mechanical properties and methods of cementing in subterranean formations, particularly in conjunction with subterranean well operations. The foamed cement compositions comprise carbon fibers, a hydraulic cement material, sufficient water to form a slurry, an expanding additive, and optionally other ingredients including a weighting agent, a retarding or accelerating agent, or the like.
대표청구항
▼
What is claimed is: 1. A method of cementing in a well bore comprising: providing a cement composition consisting essentially of a hydraulic cement, water, carbon fibers, the carbon fibers having a mean length of about 500 microns or less, a retardant, and an expanding additive selected from the gr
What is claimed is: 1. A method of cementing in a well bore comprising: providing a cement composition consisting essentially of a hydraulic cement, water, carbon fibers, the carbon fibers having a mean length of about 500 microns or less, a retardant, and an expanding additive selected from the group consisting of one or more gases, aluminum, gypsum, and magnesium oxide; placing the cement composition within the well bore; and allowing the cement composition to set therein. 2. The method of claim 1 wherein the cement composition is selected from the group consisting of a Portland cement, a pozzolana cement, a gypsum cement, a high alumina content cement, a silica cement, a high alkalinity cement, and a calcium phosphate cement. 3. The method of claim 1 wherein the carbon fibers are present in an amount of from about 1% to about 15% by weight of the cement in the cement composition. 4. The method of claim 1 wherein the carbon fibers have a mean length of about 50 to about 200 microns. 5. The method of claim 1 wherein the cement composition has a tensile strength greater than about 115 psi. 6. The method of claim 1 wherein the gas in the cement composition is selected from the group consisting of air, nitrogen and a mixture thereof. 7. The method of claim 1 wherein the water is present in the cement composition in an amount in the range of from about 25% to about 100% by weight of cement. 8. The method of claim 1 wherein the water is present in the cement composition in an amount in the range of from about 30% to about 50% by weight of cement. 9. The method of claim 1 wherein the carbon fibers have a mean length of about 150 microns, wherein the water is present in the cement composition in an amount in the range of from about 30% to about 50% by weight of cement, and wherein the tensile strength of the foamed cement is greater than about 115 psi. 10. A method of cementing in a well bore comprising: providing a cement composition capable of being foamed consisting essentially of a hydraulic cement; water; carbon fibers, the carbon fibers having a mean length of about 1 mm or less; a retardant and an expanding additive; placing the cement composition into the well bore; and allowing a gas to be produced in the cement composition before the cement composition develops compressive strength. 11. The method of claim 10 wherein the hydraulic cement is selected from the group consisting of a Portland cement, and a cement having a pH above about 12. 12. The method of claim 10 wherein the carbon fibers are present in an amount of from about 1% to about 15% by weight of the cement in the cement composition. 13. The method of claim 10 wherein the carbon fibers have a mean length of 150 microns or less. 14. The method of claim 10 wherein the cement composition has a tensile strength greater than about 258 psi. 15. The method of claim 10 wherein the expanding additive is selected from the group consisting of an aluminum powder, gypsum, and deadburned magnesium oxide. 16. The method of claim 10 wherein the water is present in the cement composition in an amount in the range of from about 25% to about 100% by weight of cement. 17. The method of claim 10 wherein the water is present in the cement composition in an amount in the range of from about 30% to about 50% by weight of cement. 18. The method of claim 10 wherein the expanding additive is selected from the group consisting aluminum, gypsum, and magnesium oxide; wherein the carbon fibers are present in an amount in the range of from about 1% to about 15% by weight of the cement, wherein the water is present in the cement composition in an amount in the range of from about 30% to about 50% by weight of the cement, and wherein the cement composition has a tensile strength greater than about 258 psi. 19. A method of cementing in a well bore comprising: providing a cement composition capable of being foamed consisting essentially of a hydraulic cement; water; an expanding additive; a retardant; and carbon fibers, the carbon fibers having a mean length of about 1 mm or less and present in amount of from about 1% by weight of the cement to about 15% by weight of the cement in the cement composition; placing the cement composition in a desired area within the well bore; and allowing a gas to become incorporated within the cement composition before the cement composition develops compressive strength. 20. The method of claim 19 wherein the expanding additive comprises one or more gases. 21. The method of claim 20 wherein the expanding additive is selected from the group consisting of air, nitrogen and a mixture thereof. 22. The method of claim 19 wherein the expanding additive is present in an amount in the range of from about 0.01% to about 60% of the volume of cement in the cement composition. 23. The method of claim 19 wherein the hydraulic cement is selected from the group consisting of a Portland cement, a pozzolana cement, a gypsum cement, a high alumina content cement, a silica cement, a calcium phosphate cement, and a high alkalinity cement. 24. The method of claim 19 wherein the carbon fibers have a mean length of about 150 microns. 25. The method of claim 19 wherein the cement composition has a tensile strength greater than about 115 psi. 26. The method of claim 19 wherein the water is present in the cement composition in an amount in the range of from about 25% to about 100% by weight of cement. 27. The method of claim 19 wherein the water is present in the cement composition in an amount in the range of from about 30% to about 50% by weight of cement. 28. The method of claim 19 wherein the expanding additive is selected from the group consisting of an aluminum powder, gypsum, and deadburned magnesium oxide. 29. The method of claim 28 wherein the hydraulic cement is selected from the group consisting of a Portland cement and a cement having a pH higher than about 12. 30. The method of claim 28 wherein the cement composition has a tensile strength greater than about 258 psi. 31. The method of claim 19 wherein the cement composition has a tensile strength greater than about 115 psi.
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