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Spiral Drill Collar

The spiral drill collar, invented and developed by Fred K. Fox in 1961, prevents or mitigates the problem of differential pressure wall sticking of drill collars leading to stuck drill strings, a prevalent problem encountered in drilling deep, high pressure and deviated wells.   

Grooves spiraled around the outer surface of the collar interrupt contact of the collar with the wall of the bore hole.  In subsequent years, the spiral concept has been expanded to casing, liners, wash pipe, and heavy weight drillpipe.  Spiral collars are used worldwide to this day in virtually all moderate to deep offshore and onshore wells and in all deviated and horizontal holes.

Recognizing the pioneering efforts of the following individuals and companies who contributed to the development of this technology: 

Fred K. Fox


2011 Call for Nominations
2011 Industry Pioneer Nomination Form 
2011 Technology Pioneer Nomination Form

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