IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0836788
(2004-04-30)
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발명자
/ 주소 |
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출원인 / 주소 |
- Schlumberger Technology Corporation
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인용정보 |
피인용 횟수 :
19 인용 특허 :
10 |
초록
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A method for determining a property of fluids in formations surrounding an earth borehole includes the following steps: producing, from measurements on a multiplicity of fluid samples, a database of stored fluid property training values related to stored fluid measurement training values; deriving,
A method for determining a property of fluids in formations surrounding an earth borehole includes the following steps: producing, from measurements on a multiplicity of fluid samples, a database of stored fluid property training values related to stored fluid measurement training values; deriving, from the database, radial basis function parameters; deriving formation fluid measurement values; and determining, using radial basis function interpolation, the property of formation fluids from values in the database, the parameters, and the derived formation fluid measurement values.
대표청구항
▼
The invention claimed is: 1. A method for determining a property of fluids in formations surrounding an earth borehole, comprising the steps of: producing, from measurements on a multiplicity of fluid samples, a database of stored fluid property training values related to stored fluid measurement t
The invention claimed is: 1. A method for determining a property of fluids in formations surrounding an earth borehole, comprising the steps of: producing, from measurements on a multiplicity of fluid samples, a database of stored fluid property training values related to stored fluid measurement training values; deriving, from said database, radial basis function parameters; deriving formation fluid measurement values; and determining, using radial basis function interpolation, said property of formation fluids from values in said database, said parameters, and said derived formation fluid measurement values. 2. The method as defined by claim 1, wherein said step of deriving, from said database, radial basis function parameters, comprises producing a radial basis function mapping function; producing a cost function using values in the database and the mapping function; and minimizing said cost function to determine said parameters. 3. The method as defined by claim 1, wherein said parameters are weights and widths. 4. The method as defined by claim 3, wherein said weight parameters are determined from output vectors derived from said database. 5. The method as defined by claim 1, wherein said step of deriving formation fluid measurement values comprises deriving nuclear magnetic resonance measurement values from fluid sampled from said formations. 6. The method as defined by claim 5, wherein said step of deriving formation fluid measurement values further comprises deriving measurement values for temperature of said formation fluid. 7. The method as defined by claim 5, wherein said step of deriving formation fluid measurement values further comprises deriving measurement values for pressure of said formation fluid. 8. The method as defined by claim 5, wherein said step of deriving formation fluid measurement values further comprises deriving measurement values for gas-oil ratio of said formation fluid. 9. The method as defined by claim 1, wherein said property of formation fluids comprises viscosity of formation fluids. 10. The method as defined by claim 5, wherein said property of formation fluids comprises viscosity of formation fluids. 11. The method as defined by claim 8, wherein said property of formation fluids comprises viscosity of formation fluids. 12. The method as defined by claim 1, wherein said property of formation fluids comprises gas-oil ratio of formation fluids. 13. The method as defined by claim 1, wherein said property of formation fluids comprises molecular composition of formation fluids. 14. The method as defined by claim 1, wherein said property of formation fluids comprises fluid density of formation fluids. 15. The method as defined by claim 1, wherein said property of formation fluids comprises bubble point pressure of formation fluids. 16. The method as defined by claim 1, wherein said property of formation fluids comprises oil formation volume factor of formation fluids. 17. The method as defined by claim 1, wherein said property of formation fluids comprises SARA. 18. The method as defined by claim 1, wherein said step of deriving formation fluid measurement values comprises deriving optical measurements from fluid sampled from said formations. 19. The method as defined by claim 1, wherein said step of deriving formation fluid measurement values comprises deriving gas-oil ratio measurements from fluid sampled from said formations. 20. The method as defined by claim 1, wherein said step of deriving formation fluid measurement values comprises deriving nuclear magnetic resonance measurement values using a nuclear magnetic resonance logging device in said borehole. 21. The method as defined by claim 5, wherein said step of deriving nuclear magnetic resonance measurement values using a nuclear magnetic resonance logging device in said borehole comprises drawing fluid from the borehole, and deriving said nuclear magnetic resonance measurement values from measurements on the fluid withdrawn from the borehole. 22. The method as defined by claim 1, wherein said step of producing, from measurements on a multiplicity of fluid samples, a database of stored fluid property training values related to stored fluid measurement training values comprises producing a database of stored fluid viscosity training values related to stored fluid nuclear magnetic resonance training values, and wherein said step of deriving formation fluid measurement values comprises deriving nuclear magnetic resonance measurement values from fluid sampled from said formations, and wherein said step of determining said property of formation fluids comprises determining viscosity of formation fluids. 23. The method as defined by claim 2, wherein said step of producing, from measurements on a multiplicity of fluid samples, a database of stored fluid property training values related to stored fluid measurement training values comprises producing a database of stored fluid viscosity training values related to stored fluid nuclear magnetic resonance training values, and wherein said step of deriving formation fluid measurement values comprises deriving nuclear magnetic resonance measurement values from fluid sampled from said formations, and wherein said step of determining said property of formation fluids comprises determining viscosity of formation fluids. 24. The method as defined by claim 4, wherein said step of producing, from measurements on a multiplicity of fluid samples, a database of stored fluid property training values related to stored fluid measurement training values comprises producing a database of stored fluid viscosity training values related to stored fluid nuclear magnetic resonance training values, and wherein said step of deriving formation fluid measurement values comprises deriving nuclear magnetic resonance measurement values from fluid sampled from said formations, and wherein said step of determining said property of formation fluids comprises determining viscosity of formation fluids. 25. The method as defined by claim 1, wherein said property of formation fluids is represented by a vector having a plurality of dimensions. 26. The method as defined by claim 1, wherein said fluid measurement values are represented by a vector having a plurality of dimensions. 27. The method as defined by claim 23, wherein said fluid measurement values are represented by a vector having a plurality of dimensions. 28. The method as defined by claim 1, further comprising repeating the steps of said method for formation fluid measurement values derived at different depth levels of said borehole, and producing a log of said property as determined at said different depth levels. 29. The method as defined by claim 1, wherein said property of formation fluids is molecular composition. 30. A method for determining a property of fluids from formations surrounding an earth borehole which have been drawn into a logging device in the borehole, comprising the steps of: producing, beforehand, from measurements on a multiplicity of fluid samples, a database of stored fluid property training values related to stored fluid measurement training values; deriving, from said database, radial basis function parameters; deriving, from measurements on said fluids that have been drawn into said logging device, formation fluid measurement values; and determining, using radial basis function interpolation, said property of formation fluids from values in said database, said parameters, and said derived formation fluid measurement values. 31. The method as defined by claim 30, wherein said step of deriving formation fluid measurement values comprises deriving nuclear magnetic resonance measurement values from fluid sampled from said formations. 32. The method as defined by claim 30, wherein said property of formation fluids comprises viscosity of formation fluids. 33. The method as defined by claim 30, wherein said property of formation fluids comprises molecular composition of formation fluids. 34. The method as defined by claim 30, wherein said parameters are weights and widths. 35. The method as defined by claim 30, wherein said property of formation fluids comprises SARA of formation fluids. 36. A method for determining a property of fluids in formations surrounding an earth borehole from a database of stored fluid property training values, comprising the steps of: deriving, from said database, radial basis function parameters; deriving formation fluid measurement values; and determining, using radial basis function interpolation, said property of formation fluids from values in said database, said parameters, and said derived formation fluid measurement values.
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