Grant Prideco, Inc.

Ed Evans

Richard W Delange

Richard W DeLange

Richard C Griffin

Jerry L Buster

An oilfield tubular string A comprising a plurality of elongate joints having one or both ends threaded. The joints may be connected by a coupling including a generally sleeve shaped coupling body having a tapered upstream thread profile and a tapered downstream thread profile for threaded engagement with a mating profile of a respective joint. The coupling body includes a low stress flex groove having a selected box thread runout bevel angle, and all transitions in the flex groove between surfaces are radiused to greater than 0.100 inches to minimize stress risers. A pin-in-box connection between tubular joints includes mating tapered threads engagement of end shoulder and and a low stress flex groove The present invention allows the elongate joints to be used as both a casing string and a drill string, thereby saving significant time and expense.

Casing drilling connector with low stress flex groove

A threaded connection for improving fatigue resistance to cyclic loading is disclosed. The threaded connection basically comprises a pair of interlocking members having corresponding radially inner and radially outer spiral threads thereon, each spiral thread including a spiral compression flank and a spiral tension flank wherein at least one of the spiral compression flanks and spiral tension flanks on the inner spiral threads are in mating planar engagement with a corresponding spiral compression flank and spiral tension flank on the outer spiral thread. Axial spacing between the tension flanks and the compression flanks on the radially inner and radially outer spiral threads further define a stress reducing spiral root surface on at least one of the radially inner and radially outer threads and a corresponding crest surface on the other radially inner and radially outer spiral threads. Resistance to cyclic loading on the threaded connection is improved because of the stress reducing spiral root surface which includes a substantially linear profile spaced axially between the compression flank of one thread and a tension flank of an adjoining thread. The stress reducing spiral root surface intersects the compression flank and tension flank along corresponding first and second axially spaced rounded surfaces each having a radius of at least 0.015 inches. Loading is therefore, distributed evenly over the threads rather than being concentrated at what normally would be a sharp juncture formed in the root of the thread.

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Spring, TX, United States of America

Ed Evans