IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
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출원번호 |
US-0301029
(2002-11-20)
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발명자
/ 주소 |
- Brothers, Lance E.
- Keener, Krista L.
- Braden, James A.
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출원인 / 주소 |
- Halliburton Energy Services, Inc.
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대리인 / 주소 |
Roddy, Craig W.Dougherty, Jr., C. Clark
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인용정보 |
피인용 횟수 :
41 인용 특허 :
7 |
초록
▼
The present invention provides methods, lightweight well cement compositions and additives for the well cement compositions. The methods of the invention for sealing pipe in a well bore penetrating a zone or formation which readily fractures at low hydrostatic pressure is basically comprised of the
The present invention provides methods, lightweight well cement compositions and additives for the well cement compositions. The methods of the invention for sealing pipe in a well bore penetrating a zone or formation which readily fractures at low hydrostatic pressure is basically comprised of the steps of providing a lightweight cement composition comprised of a hydraulic cement, water and an additive comprising a suspension of microspheres in water gelled with sodium bentonite, placing the cement composition in the annulus between the pipe and the well bore and allowing the cement composition to set.
대표청구항
▼
The present invention provides methods, lightweight well cement compositions and additives for the well cement compositions. The methods of the invention for sealing pipe in a well bore penetrating a zone or formation which readily fractures at low hydrostatic pressure is basically comprised of the
The present invention provides methods, lightweight well cement compositions and additives for the well cement compositions. The methods of the invention for sealing pipe in a well bore penetrating a zone or formation which readily fractures at low hydrostatic pressure is basically comprised of the steps of providing a lightweight cement composition comprised of a hydraulic cement, water and an additive comprising a suspension of microspheres in water gelled with sodium bentonite, placing the cement composition in the annulus between the pipe and the well bore and allowing the cement composition to set. time is less than 240 minutes. 3. The method according to claim 2, wherein said temperature is 160-200° C., and said period of time is ranging from 30 minutes to 120 minutes. 4. The method according to claim 1, wherein said CPC powder comprises one or more calcium phosphates selected from the group consisting of alpha-tricalcium phosphate (α-TCP), beta- tricalcium phosphate (β-TCP), tetracalcium phosphate (TTCP), monocalcium phosphate monohydrate (MCPM), monocalcium phosphate anhydrous (MCPA), dicalcium phosphate dihydrate (DCPD), dicalcium phosphate anhydrous (DCPA), octacalcium phosphate (OCP), calcium dihydrogen phosphate, calcium dihydrogen phosphate hydrate, acid calcium pyrophosphate, anhydrous calcium hydrogen phosphate, calcium hydrogen phosphate hydrate, calcium pyrophosphate, calcium triphosphate, calcium polyphosphate, calcium metaphosphate, anhydrous tricalcium phosphate, tricalcium phosphate hydrate, apatite, hydroxyapatite, and fluorapatite. 5. The method according to claim 1, wherein said CPC powder comprises dicalcium phosphate anhydrous and tetracalcium phosphate. 6. The method according to claim 2, wherein said CPC powder comprises dicalcium phosphate anhydrous and tetracalcium phosphate. 7. The method according to claim 3, wherein said CPC powder comprises dicalcium phosphate anhydrous and tetracalcium phosphate. 8. The method according to claim 1, wherein said CPC powder has particle sizes ranging from 0.05 to 100 microns, and particles of said CPC powder have whiskers or fine crystals on their surfaces having a width ranging from 1 to 100 nm and a length ranging from 1 to 1000 nm. 9. The method according to claim 1, wherein said CPC powder has a molar ratio of calcium to phosphate ranging from 0.5 to 2.5. 10. The method according to claim 8, wherein said CPC powder comprises dicalcium phosphate anhydrous and tetracalcium phosphate. 11. A method of preparing a calcium phosphate cement (CPC) paste comprising mixing a CPC powder with an aqueous solution, and heating said CPC powder, prior to said mixing, so that said CPC powder is maintained at a temperature 50-400° C. for a period of time which is greater than one minute, and that a CPC paste formed by mixing the resulting heated CPC powder with said aqueous solution has a shortened working and setting time in comparison with that formed by mixing said CPC powder not subjected to said heating with said aqueous solution. 12. A method for preparing a calcium phosphate cement (CPC) paste which comprises heating a CPC powder at a temperature of from 50-400° C. for a period of time which is greater than one minute, and then mixing the heated CPC powder with an aqueous solution to for a CPC paste, said paste having a shortened working and setting time in comparison with a paste formed by mixing the CPC powder not subjected to heating prior to mixing with the aqueous solution. 13. The method according to claim 12, wherein said temperature is 100-250° C., and said period of time is less than 240 minutes. 14. The method according to claim 12, wherein said CPC powder comprises one or more calcium phosphates selected from the group consisting of alpha-tricalcium phosphate (α-TCP), beta- tricalcium phosphate (β-TCP), tetracalcium Sa, phosphate (TTCP), monocalcium phosphate monohydate (MCPM), monocalcium phosphate anhydrous (MCPA), dicalcium phosphate dihydrate (DCPD), dicalcium phosphate anhydrous (DCPA), octacalcium phosphate (OCP), calcium dihydrogen phosphate, calcium dihydrogen phosphate hydrate, acid calcium pyrophosphate, anhydrous calcium hydrogen phosphate, calcium hydrogen phosphate hydrate, calcium pyrophosphate, calcium triphosphate, calcium polyphosphate, calcium metaphosphate, anhydrous tricalcium phosphate, tricalcium phosphate hydrate, apatite, hydroxyapatite, and fluoroaptite. 15. The method according to claim 12, wherein said CPC powder comprises dicalcium phosphate anhydrous and tetracalcium phosphate. 16. The method according to claim 13, wher
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