US 11,898,404 B2
Drill string components having multiple-thread joints
Christopher L. Drenth, Burlington (CA); and Keith William Littlely, Clarkson (AU)
Assigned to Boart Longyear Company, Salt Lake City, UT (US)
Filed by BLY IP INC., Salt Lake City, UT (US)
Filed on Dec. 10, 2019, as Appl. No. 16/709,552.
Application 16/709,552 is a continuation of application No. 15/848,237, filed on Dec. 20, 2017, granted, now 10,570,676.
Application 15/848,237 is a continuation of application No. 14/026,611, filed on Sep. 13, 2013, granted, now 9,850,723, issued on Dec. 26, 2017.
Application 14/026,611 is a continuation in part of application No. 13/717,885, filed on Dec. 18, 2012, abandoned.
Application 13/717,885 is a continuation in part of application No. 13/354,189, filed on Jan. 19, 2012, granted, now 9,810,029, issued on Nov. 7, 2017.
Claims priority of provisional application 61/700,401, filed on Sep. 13, 2012.
Claims priority of provisional application 61/436,331, filed on Jan. 26, 2011.
Prior Publication US 2020/0181990 A1, Jun. 11, 2020
Int. Cl. E21B 17/22 (2006.01); E21B 17/042 (2006.01)
CPC E21B 17/22 (2013.01) [E21B 17/042 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A threaded drill string component comprising:
a hollow body having a first end, an opposing second end, and a central axis extending through the hollow body; and
two threads positioned on the first end of the hollow body, each of the two threads having a leading end, wherein the leading ends of the two threads are circumferentially spaced 180 degrees apart; wherein:
each of the two threads comprises a plurality of helical turns extending along the first end of the hollow body from a location proximate a leading edge of the first end of the hollow body toward the second end of the hollow body,
each of the two threads has a thread root, a thread crest, a thread pitch, and a thread width,
each of the two threads has a clearance flank and a pressure flank, wherein the pressure flank is oriented at an angle ranging from +2 to +15 degrees relative to a plane perpendicular to the central axis of the hollow body,
the crest of at least one of the two threads circumscribes a frusta-conical surface extending over at least a portion of the axial length of the plurality of helical turns of said at least one thread,
the generatrix of the frusta-conical surface is a straight line that lies at an angle of 0.75 to 1.6 degrees relative to the central axis extending through the hollow body.