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1. WO2005068994 - PROCEDE ET APPAREIL PERMETTANT DE DETERMINER LA CONTAMINATION D'UN FILTRAT DE FOND DE PUITS A PARTIR DE MESURES DE DENSITE

Considéré comme nul:  27.07.2005
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

Our Ref: 584-35144-WO
What is claimed is:
1. A method for determining a percentage of filtrate in a mixture of filtrate and a fluid from a formation downhole comprising:
estimating a density of the fluid in the mixture of filtrate and fluid;
estimating a density of the filtrate in the mixture of filtrate and fluid;
estimating a density of the mixture of filtrate and fluid downhole; and
estimating a percentage of filtrate in the mixture of filtrate and fluid, from the
relationship f = (pM - Po) / (PF - Po) where, pF is equal to density of filtrate, p0 is equal to the density of the fluid, and pu is equal to the density of the mixture of the filtrate and fluid.
2. The method of claim 1, wherein estimating the density of the fluid further comprises: measuring a pressure of the fluid at a series of depths; and
estimating the density of the fluid from a gradient of measured pressure versus depth. 3. The method of claim 2, wherein the estimating the density of the fluid from a gradient of pressure versus depth further comprises performing a least squares fit of the
pressure measurements versus depth to determine a slope for a pressure versus depth relationship, the slope being proportional to the density of the fluid.
4. The method of claim 1 , wherein estimating the density of fluid further comprises:
exposing the fluid to a mechanical resonator; and measuring a response from a
mechanical resonator to determine the density of the fluid.
5. The method of claim 1 , wherein estimating the density of filtrate further comprises : exposing an initial flow of the fluid from the formation to a mechanical resonator; and measuring a response from a mechanical resonator to determine the density of the filtrate.
6. The method of claim 1 , wherein estimating the density of filtrate further comprises:

Our Ref: 584-35144-WO
exposing the filtrate to a density measurement device.
7. The method of claim 1 , further comprising:
estimating sample cleanup from the percentage of filtrate in the mixture of filtrate and fluid.
8. The method of claim 1 , wherein estimating the density of mixture of fluid and filtrate further comprises:
exposing the mixture of fluid and filtrate to a mechanical resonator; and
measuring a response from a mechanical resonator to determine the density of the mixture of fluid and filtrate.
9. The method of claim 1, wherein estimating the density of mixture of fluid and filtrate further comprises:
exposing the mixture of fluid and filtrate to a high precision density measuring device. 10. An apparatus for determining a percentage of filtrate in a mixture of filtrate and a fluid from a formation comprising:
a pressure gauge for measuring a pressure for the formation at a plurality of depths;
and
a processor programmed to estimate a density of the fluid in the mixture of filtrate and fluid, a density of the filtrate in the mixture of filtiate and fluid, a density of the
mixture of filtrate and fluid and estimate estimating a percentage of filtrate in the mixture of filtiate and fluid, from the relationship f = (PM - Po) / (PF - Po) where, PF is equal to density of filtrate, p0 is equal to the density of the fluid, and PM is equal to the density of the mixture of the filtrate and fluid.
11. The apparatus of claim 10, wherein the processor estimates the density of the
formation fluid further using the pressure measurements at the plurality of depths and estimates the density of the fluid from a gradient of measured pressures versus depths.

Our Ref: 584-35144-WO
12. The apparatus of claim 11, wherein the processor estimates the density of the
formation fluid from a gradient of pressure versus depth further by performing a least squares fit of the pressure measurements versus depths to determine a slope for a pressure versus depth relationship, the slope being proportional to the density of the fluid.
13. The apparatus of claim 10, further comprising:
a mechanical resonator exposed to the fluid, wherein the processor measures a
response from the mechanical resonator to determine the density of the fluid.
14. The apparatus of claim 10, further comprising:
a mechanical resonator exposed to an initial flow of the fluid from the formation wherein the processor measures a response from the mechanical resonator to
determine the density of the filtrate.
15. The apparatus of claim 10, further comprising:
a high precision density measuring device for measuring the density of the filtrate.

16. The apparatus of claim 10, wherein the processor estimates a degree of sample
cleanup from the percentage of filtrate in the mixture of filtrate and fluid.
17. The apparatus of claim 10, further comprising:
a mechanical resonator exposed to the mixture of fluid and filtrate, wherein the
processor measures a response from the mechanical resonator to determine the density of the mixture of fluid and filtrate.
18. The apparatus of claim 10, further comprising:
a high precision density measuring device that measures the density of the mixture of fluid and filtrate.
19. A system for determining a percentage of filtrate in a mixture of filtrate and a fluid from a formation comprising:

Our Ref: 584-35144-WO
a downhole tool comprising a pressure gauge for measuring a pressure for the
formation at a plurality of depths; and
a processor programmed to estimate a density of the fluid in the mixture of filtrate and fluid, a density of the filtrate in the mixture of filtrate and fluid, a density of the
mixture of filtrate and fluid and estimate estimating a percentage of filtrate in the mixture of filtrate and fluid, from the relationship f = (PM - Po) / (PF - Po) where, pv is equal to density of filtrate, p is equal to the density of the fluid, and pu is equal to the density of the mixture of the filtrate and fluid.
20. The system of claim 19, wherein the processor estimates the density of the formation fluid further using the pressure measurements at the plurality of depths and estimates the density of the fluid from a gradient of measured pressures versus depths.
21. The system of claim 20, wherein the processor estimates the density of the formation fluid from a gradient of pressures versus depths by performing a least squares fit of the pressure measurements versus depth to determine a slope for a pressure versus depth relationship, the slope being proportional to the density of the fluid.
22. The system of claim 19, further comprising:
a mechanical resonator exposed to the fluid, wherein the processor measures a
response from the mechanical resonator to determine the density of the fluid.
23. The system of claim 19, further comprising:
a mechanical resonator exposed to an initial flow of the fluid from the formation wherein the processor measures a response from the mechanical resonator to
determine the density of the filtrate.
24. The system of claim 19, further comprising:
a high precision density measuring device for measuring the density of the filtrate. 25. The system of claim 19, wherein the processor estimate sample cleanup from the Our Ref: 584-35144-WO
percentage of filtrate in the mixture of filtrate and fluid.
26. The system of claim 19, further comprising:
a mechanical resonator exposed to the mixture of fluid and filtrate, wherein the
processor measures a response from the mechanical resonator to determine the density of the mixture of fluid and filtrate.
27. The system of claim 19, further comprising:
a high precision density measuring device that measures the density of the mixture of fluid and filtrate.