US 9,810,029 B2
Drill string components resistant to jamming
Christopher L. Drenth, Draper, UT (US); and Keith William Littlely, Guilderton (AU)
Assigned to BLY IP INC., Salt Lake City, UT (US)
Filed by Christopher L. Drenth, Draper, UT (US); and Keith William Littlely, Guilderton (AU)
Filed on Jan. 19, 2012, as Appl. No. 13/354,189.
Claims priority of provisional application 61/436,331, filed on Jan. 26, 2011.
Prior Publication US 2012/0273233 A1, Nov. 1, 2012
Int. Cl. E21B 17/042 (2006.01)
CPC E21B 17/042 (2013.01) 23 Claims
OG exemplary drawing
 
1. A threaded drill string component that resists jamming and cross threading, comprising:
a hollow body having a first end, an opposing second end, and a central axis extending through the hollow body; and
a thread positioned on the first end of the hollow body;
wherein:
the thread comprises a plurality of helical turns extending along the first end of the hollow body,
the thread has a substantially constant thread depth and a substantially constant thread width,
the thread width is greater than the thread depth,
the thread comprises a leading end proximate the first end of the hollow body,
the leading end of the thread is orientated at an acute angle relative to the central axis of the hollow body,
the leading end of the thread faces toward an adjacent turn of the thread,
the leading end of the thread comprises a planar surface extending normal to the hollow body,
the thread is tapered relative to the central axis,
the planar surface of the leading end of the thread extends the full thread width from a leading edge of the thread to a trailing edge of the thread,
the leading edge of the thread defines a clearance flank oriented at an angle of at least 45 degrees relative to a transverse axis that is perpendicular to the hollow body, and
the trailing edge of the thread is oriented at a negative pressure flank angle relative to the transverse axis.