Claims
- 1-20. (canceled)
- 21. A method of determining a parameter of interest of an earth formation having a plurality of layers, the method comprising:
conveying a multi-component resistivity logging tool into a borehole in a selected layer in said formation; and using transmitter receiver combinations to provide measurement selective sensitivity to the desired reservoir formation properties.
- 22. The method of claim 21, further comprising:
making multi-component measurements for at least one of geo-steering and drilling assistance and well placement decisions.
- 23. The method of claim 21, further comprising:
measurement of a multi-component array combined with measurement of at least one of a gyro, accelerometer, magnetometer and inclinometer.
- 24. The method of claim 21, further comprising:
performing dual compensated measurement of a multi-component array to improve at lest one of signal to noise ratio and measurement stability and signal content with reservoir, geological and geophysical information.
- 25. The method of claim 21, further comprising:
measuring multiple frequency in at least one of sequentially and simultaneously; and analyzing multiple frequency survey data for focusing interpretative data in target formation parameters.
- 26. The method of claim 21 further comprising:
performing multi-component transmitter receiver array measurements at different orthogonal and non-orthogonal orientations comprising at least one of xy, xz, yz, 20°-40°, and 40°-90°.
- 27. The method of claim 21 further comprising:
performing multi-component measurements combining measurement comprising at least one of symmetric/symmetric, asymmetric/symmetric, and asymmetric/asymmetric.
- 28. The method of claim 21, further comprising:
using measurements for geosteering.
- 29. The method of claim 21, further comprising:
measuring time domain response; and converting time domain into frequency domain and selecting a frequency spectrum of interest for analysis.
- 30. A method of determining a parameter of interest of an earth formation having a plurality of layers, the method comprising:
conveying a logging tool into a borehole in a selected layer in said formation, said borehole having a first axial direction at an angle to said layers; exciting a first transmitter having a second axial direction inclined to said first axial direction for producing a magnetic field in the earth formation and receiving a first signal in a first receiver having an axis parallel to said first axial direction; exciting a second transmitter having a third axial direction inclined to said first and second axial directions for producing a magnetic field in the earth formation and receiving a second signal in the first receiver; determining from first and second signals said parameter of interest; wherein a first of said plurality of layers in said formation above said selected layer has a different resistivity than a second of said plurality of layers in said formation below said selected layer, and wherein said parameter of interest includes a direction of the more resistive of said first and second layers relative to the selected layer.
- 31. The method of claim 30 further comprising exciting the first transmitter and the second transmitter at a first frequency and a second frequency, the method further comprising determining a distance and location from the borehole to at least one of (i) the first layers, and, (ii) the second layer or formation resistivity survey target, identify resistivity anomaly.
- 32. The method of claim 31 wherein said logging tool is conveyed on a bottom hole assembly used for drilling of the borehole, the method further comprising controlling the drilling of the borehole based on at least one of determined distance and direction.
- 33. The MWD tool of claim 1, further comprising:
a first aperture shaped to focus a magnetic field for a first coil associated with the first aperture.
- 34. The MWD tool of claim 33 further comprising:
a switch to adjust the geometry and associated effective electromagnetic characteristics of the aperture.
- 35. The MWD tool of claim 33 or 34 further comprising a second aperture for a second coil associated with the first aperture which combines with the first aperature to produce a combined electromagnetic characteristic for the combined coil electromagnetic fields.
- 36. The method of claim 21 or 23, further comprising:
binning measurement data.
- 37. The method of claim 36 further comprising:
averaging depth intervals and azimuthal sectors for the binned measurement data.
- 38. The method of claim 36 or 37 further comprising:
processing the binned measurement data; and estimating or inverting formation drilling target parameters from the processed binned measurement data from a given transmitter receiver array.
- 39. The method of claim 38, further comprising:
making a well placement plan along with a known reservoir drilling target model; defining expect measurement response for a transmitter receiver array.
- 40. The method of claim 39, further comprising:
making a drilling decision to continue or modify drilling plans based on differences between inverted formation drilling target parameters obtained from processed measured binned data and the expected measurements response based on an initial drilling plan and reservoir parameter model.
- 41. The method of claim 21, wherein a transmitter source is periodic with respect to both time domain and frequency domain.
- 42. The method of claim 21, wherein
the raw data assigned to a depth interval and azimuth sector falls in different points of the repeat cycle thus, further comprising, averaging a time series having unequal time intervals between sampled points.
- 43. The method of claim 21, where the tool rotation is not synchronized with a transmitter repeat cycle.
- 44. The method of claim 21, wherein the tool rotation is synchronized with the transmitter repeat cycle.
- 45. The method of claim 21, further comprising:
holding the tool stationary while the raw data times are collected.
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation in part of U.S. patent application Ser. No. 09/922,393 entitled “Multi-Component Induction Instrument” filed on Aug. 3, 2001 by Otto N. Fanini and Stanislav W. Forgang. This application is related to and claims priority from U.S. patent application Ser. No. 09/471,289, entitled “Apparatus Accurately Measuring Properties of a Formation” by Otto N. Fanini, Stanislav W. Forgang and Michael S. Crosskno, filed on Dec. 24, 1999. This application is related to and claims priority from U.S. Provisional Patent Application No. 60/361,570, entitled “Method and Apparatus for the use of Multicomponent Induction Tool and Cross Component Measurements for Geosteering and Formation Resistivity Data Interpretation in Horizontal Wells” by Abbas Merchant, Otto Fanini, Berthold Kriegshauser and Liming Yu, filed on Mar. 4, 2002.
Provisional Applications (1)
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Number |
Date |
Country |
|
60361570 |
Mar 2002 |
US |
Divisions (1)
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Number |
Date |
Country |
Parent |
10214436 |
Aug 2002 |
US |
Child |
10824093 |
Apr 2004 |
US |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
09922393 |
Aug 2001 |
US |
Child |
10214436 |
Aug 2002 |
US |