Method and apparatus for detecting boundary stratum

Details Method and apparatus for detecting boundary stratum Method and apparatus for detecting boundary stratum

G - Physics

01

V

G01V 3/30 (2006.01) E21B 7/04 (2006.01) E21B 47/02 (2006.01) G01V 3/18 (2006.01)

Patent

CA 2111356

Methods and apparatus for detecting the approach of a boundary stratum (5) while drilling in a substantially horizontal subsurface zone (4) using sensor tools having sensors (6, 7) with different depths of investigation. The two depths of investigation signals are used to reduce spurious signals. In some cases, dips or angles of the boundary strat with the borehole may be deter- mined, In alternative embodiments, one or more electromagnetic energy transmitters (16',18',20') are used with a single receiver (R1, R2 to generate a characteristic signature of approaching boundary stratum.

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