E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 47/026 (2006.01) E21B 47/00 (2006.01) G01V 3/28 (2006.01)
Patent
CA 2397168
A method is disclosed for using a triad induction tool to identify the formation strike and dip angles. The method can be performed in real time. In one embodiment, the method includes: (1) measuring a magnetic coupling between transmitter coils and receiver coils of a tool in the borehole; (2) obtaining from the measured coupling a strike angle between the tool and the formation; (3) applying a rotational transformation to the coupling measurements to correct for the strike angle; and (4) applying a predetermined set of rotational transformations to the coupling to determine coupling term values as a function of rotation angle. A least- squares curve fit or a Hough transform of the derivative of the coupling term values with respect to position may be used to identify the dip angle.
Gao Li
Gianzero Stanley C.
Emery Jamieson Llp
Halliburton Energy Services Inc.
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