Downward communication in a borehole through drill string...

Details Downward communication in a borehole through drill string... Downward communication in a borehole through drill string...

E - Fixed Constructions

21

B

E21B 44/00 (2006.01) E21B 47/12 (2006.01)

Patent

CA 2330197

A method for downward communication in a borehole containing a pipe string, comprising the steps of: imparting a series of rotary motions to an upper portion of the string, the rotary motions representing at least two levels of a coded data sequence, the rotary motions imparted to a string upper portion effecting generally comparable motions at a lower portion of the string; the motions at the string lower portion effecting a downhole detectable condition or conditions indicative of rotation or no-rotation; detecting the condition or conditions to determine a corresponding coded data sequence; and processing corresponding data sequence to recover the imparted coded data sequence, from which a unique transmitted message is determinable.

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