IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
US-0312683
(2005-12-19)
|
| 등록번호 |
US-7458257
(2008-12-02)
|
|
발명자
/ 주소 |
- Pop,Julian J.
- Taherian,Reza
- Poitzsch,Martin E.
- Tabanou,Jacques R.
|
| 출원인 / 주소 |
- Schlumberger Technology Corporation
|
| 대리인 / 주소 |
|
| 인용정보 |
피인용 횟수 :
23 인용 특허 :
43 |
초록
▼
A method for determining a property of formations surrounding an earth borehole being drilled with a drill bit at the end of a drill string, using drilling fluid that flows downward through the drill string, exits through the drill bit, and returns toward the earth's surface in the annulus between t
A method for determining a property of formations surrounding an earth borehole being drilled with a drill bit at the end of a drill string, using drilling fluid that flows downward through the drill string, exits through the drill bit, and returns toward the earth's surface in the annulus between the drill string and the periphery of the borehole, including the following steps: obtaining, downhole near the drill bit, a pre-bit sample of the mud in the drill string as it approaches the drill bit; obtaining, downhole near the drill bit, a post-bit sample of the mud in the annulus, entrained with drilled earth formation, after its egression from the drill bit; implementing pre-bit measurements on the pre-bit sample; implementing post-bit measurements on the post-bit sample; and determining a property of the formations from the post-bit measurements and the pre-bit measurements.
대표청구항
▼
We claim: 1. A method for determining a property of formations surrounding an earth borehole being drilled with a drill bit at the end of a drill string, using drilling fluid that flows downward through the drill string, exits through the drill bit, and returns toward the earth's surface in the ann
We claim: 1. A method for determining a property of formations surrounding an earth borehole being drilled with a drill bit at the end of a drill string, using drilling fluid that flows downward through the drill string, exits through the drill bit, and returns toward the earth's surface in the annulus between the drill string and the periphery of the borehole, comprising the steps of: obtaining, downhole near the drill bit, a pre-bit sample of the mud in the drill string as it approaches the drill bit; obtaining, downhole near the drill bit, a post-bit sample of the mud in the annulus, entrained with drilled earth formation, after its egression from the drill bit; implementing pre-bit measurements on the pre-bit sample; implementing post-bit measurements on the post-bit sample; and determining said property of the formations from said post-bit measurements and said pre-bit measurements; wherein said steps of implementing pre-bit measurements on the pre-bit sample and implementing post-bit measurements on the post-bit sample are performed downhole; and wherein said step of determining said property of the formations from said post-bit measurements and said pre-bit measurements comprises determining said property from ratios of said post-bit measurements and said pre-bit measurements. 2. The method as defined by claim 1, wherein said step of determining said property of the formations from said post-bit measurements and said pre-bit measurements is performed downhole. 3. The method as defined by claim 2, further comprising transmitting uphole said determined property of the formations. 4. The method as defined by claim 1, further comprising transmitting uphole one of said property, said pre-bit measurements, said post-bit measurements and combinations thereof. 5. The method as defined by claim 1, wherein said step of determining said property of the formations comprises determining a plurality of properties of the formations. 6. The method as defined by claim 1, wherein said step of determining said property comprises determining the composition of one of the pre-bit sample, the post-bit sample and combinations thereof. 7. A method for determining a property of formations surrounding an earth borehole being drilled with a drill bit at the end of a drill string, using drilling fluid that flows downward through the drill string, exits through the drill bit, and returns toward the earth's surface in the annulus between the drill string and the periphery of the borehole, comprising the steps of: obtaining, downhole near the drill bit, a post-bit sample of the mud in the annulus, entrained with drilled earth formation, after its egression from the drill bit; and implementing downhole post-bit measurements on the post-bit sample, including separating solid components and fluid components of the post-bit sample, and analyzing at least one of said separated components. 8. The method as defined by claim 7, further comprising determining said property from the result of the analysis of said at least one of the separated components. 9. The method as defined by claim 7 wherein said step of separating solid components includes separating solids within a given range of sizes. 10. The method as defined by claim 7, wherein said step of separating solid components includes providing a downhole sieve, and using said sieve in selection of said solid components. 11. The method as defined by claim 7, wherein said step of separating solid components comprises separating using a centrifuge. 12. The method as defined by claim 7, wherein said step of implementing downhole measurements on said post-bit sample includes heating said solid components to remove fluids therefrom, and analyzing said fluids. 13. The method as defined by claim 12, wherein said step of analyzing fluid components includes heating said fluid components to obtain a vapor, and analyzing said vapor. 14. The method as defined by claim 13, further comprising repeating said heating said fluid components and analyzing said vapor steps at a higher temperature. 15. The method as defined by claim 12, wherein said step of analyzing said fluids is implemented using selective membranes. 16. The method as defined by claim 7, wherein said step of implementing downhole measurements on said post-bit sample includes analyzing said fluid components by extracting components from liquid components of said fluid components, and analyzing said components. 17. The method as defined by claim 7, wherein said step of implementing post-bit measurements on the post-bit sample comprises providing a downhole mass spectrometer, and implementing analysis of said fluids using said downhole mass spectrometer. 18. The method as defined by claim 7, further comprising obtaining, downhole near the drill bit, a pre-bit sample of the mud in the drill string as it approaches the drill bit; and of determining the composition of one of the pre-bit sample, the post-bit sample and combinations thereof. 19. The method as defined by claim 18, further comprising transmitting uphole one of said property, pre-bit measurements, post-bit measurements and combinations thereof. 20. A method for determining a property of formations surrounding an earth borehole being drilled with a drill bit at the end of a drill string, using drilling fluid that flows downward through the drill string, exits through the drill bit, and returns toward the earth's surface in the annulus between the drill string and the borehole, comprising the steps of: obtaining, downhole near the drill bit, a post-bit sample of the mud in the annulus, entrained with drilled earth formation, after its egression from the drill bit; providing a downhole mass spectrometer; and implementing downhole post-bit measurements on the post-bit sample with said mass spectrometer. 21. The method as defined by claim 20, further comprising transmitting uphole said post-bit measurements. 22. A method for determining a property of formations surrounding an earth borehole being drilled with a drill bit at the end of a drill string, using drilling fluid that flows downward through the drill string, exits through the drill bit, and returns toward the earth's surface in the annulus between the drill string and the periphery of the borehole, comprising the steps of: obtaining, downhole near the drill bit, a pre-bit sample of the mud in the drill string as it approaches the drill bit; obtaining, downhole near the drill bit, a post-bit sample of the mud in the annulus, entrained with drilled earth formation, after its egression from the drill bit; implementing pre-bit measurements on the pre-bit sample; implementing post-bit measurements on the post-bit sample; and determining said property of the formations from said post-bit measurements and said pre-bit measurements; wherein said steps of implementing pre-bit measurements on the pre-bit sample and implementing post-bit measurements on the post-bit sample are performed downhole; and wherein said step of implementing measurements on said post-bit sample includes separating solid components and fluid components of the post-bit sample, and analyzing said solid components. 23. The method as defined by claim 22, wherein said step of determining said property of the formations from said post-bit measurements and said pre-bit measurements is performed downhole. 24. The method as defined by claim 22, further comprising transmitting uphole one of said property, said pre-bit measurements, said post-bit measurements and combinations thereof. 25. The method as defined by claim 22, wherein said step of determining said property of the formations from said post-bit measurements and said pre-bit measurements comprises determining said property from at least one of comparisons, differences, and ratios between said post-bit measurements and said pre-bit measurements. 26. The method as defined by claim 22, wherein said step of implementing post-bit measurements on the post-bit sample comprises providing a downhole mass spectrometer, and implementing said measurements using said mass spectrometer. 27. The method as defined by claim 22, wherein said step of determining said property comprises determining the composition of one of the pre-bit sample, the post-bit sample and combinations thereof. 28. The method as defined by claim 22, said step of analyzing said solid components includes heating said solid components to remove fluids therefrom, and analyzing said fluids. 29. The method as defined by claim 22, wherein said step of separating solid components includes separating solids within a given range of sizes. 30. The method as defined by claim 22, wherein said step of separating solid components includes providing a downhole sieve, and using said sieve in selection of said solid components. 31. The method as defined by claim 22, wherein said step of separating solid components comprises separating using a centrifuge. 32. The method as defined by claim 22, wherein said step of implementing measurements on said post-bit sample includes analyzing said fluid components. 33. The method as defined by claim 32, wherein said step of analyzing said fluid components is implemented using selective membranes. 34. The method as defined by claim 32, wherein said step of analyzing said fluid components includes extracting components from liquid components of said fluid components, and analyzing said components.
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