Apparatus and method for determining a drilling mode to...

Details Apparatus and method for determining a drilling mode to... Apparatus and method for determining a drilling mode to...

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.

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