| US 7,471,088 B2 | ||
| Elimination of the anisotropy effect in LWD azimuthal resistivity tool data | ||
| Liming Yu, Stafford, Tex. (US); Tsili Wang, Katy, Tex. (US); and Jack Signorelli, Houston, Tex. (US) | ||
| Assigned to Baker Hughes Incorporated, Houston, Tex. (US) | ||
| Filed on Dec. 09, 2005, as Appl. No. 11/298,255. | ||
| Claims priority of provisional application 60/635533, filed on Dec. 13, 2004. | ||
| Prior Publication US 2006/0255810 A1, Nov. 16, 2006 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. G01V 3/18 (2006.01) | ||
| U.S. Cl. 324—339 [324/343; 702/7] | 21 Claims |
| 1. A method of evaluating an anisotropic earth formation having an interface therein, the method comprising:
(a) conveying a resistivity measuring instrument having at least one receiver coil into a borehole in the earth formation;
(b) obtaining principal cross-component measurements at the at least one receiver resulting from excitation on opposite sides
of the at least one receiver;
(c) estimating from the principal cross-component measurements a distance to the interface, the estimation reducing an effect
of the anisotropy of the earth formation.
|