E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 49/00 (2006.01) E21B 7/04 (2006.01) G01V 1/40 (2006.01) E21B 47/00 (2006.01) E21B 47/12 (2006.01)
Patent
CA 2259853
There are many natural pauses during rotary drilling operations where a portion of the drill string remains stationary. Pauses include drill pipe connections. circulating time. and fishing operations. These pauses are used to obtain formation evaluation measurements that take a long time or that benefit from a quiet environment, as opposed to the naturally noisy drilling environment. Various techniques that are sensitive to the mud flow, weight-on-bit, or motion of the drill string may be used alone or in combination to identify the drilling mode and control the data acquisition sequence.
Crary Steven F.
Esmersoy Cengiz
Heidler Ralf
Poitzsch Martin E.
Schlumberger Canada Limited
Smart & Biggar
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