Scientific Drilling International, Inc.

Robert M Baker

Donald H Van Steenwyk

Raymond W Teys

Gary A McBroom

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.

Downward communication in a borehole through drill string rotary modulation

An apparatus for the protection of instrumentation placed within a drill string in a well, as during drilling comprising support structure, including a carrier sized for reception in the string, and; elastomeric structure carried by the support structure and including multiple elastomeric pads spaced about a longitudinal axis defined in the well, the pads extending generally longitudinally, and protruding in directions radially of the axis to absorb radial loading and torsional loading exerted in direction about the axis, and to deflect in said directions of radial and torsional loading.

Multi-mode cushioning an instrument suspended in a well

An apparatus for supporting instrumentation in a drill collar in a well, such instrumentation being subject to travel in the well to and from the drill collar comprising instrumentation having upper and lower end portions and being elongated between the end portions; there being tongue and groove interfit elements to suspend the instrumentation at the drill collar; one of the elements carried by the drill collar, and the other of the elements carried by the upper portion of the instrumentation, whereby the elements interfit as the instrumentation is traveled downwardly in the drill collar with the instrumentation lower portion hanging freely below the level of the elements.

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The Woodlands, TX, United States of America

Robert M Baker