SE7905381L - DRILL - Google Patents

DRILL

Info

Publication number
SE7905381L
SE7905381L SE7905381A SE7905381A SE7905381L SE 7905381 L SE7905381 L SE 7905381L SE 7905381 A SE7905381 A SE 7905381A SE 7905381 A SE7905381 A SE 7905381A SE 7905381 L SE7905381 L SE 7905381L
Authority
SE
Sweden
Prior art keywords
helical
crest portion
crest
thread
recess
Prior art date
Application number
SE7905381A
Other languages
Swedish (sv)
Inventor
E A Bailey
Original Assignee
Joy Mfg Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Joy Mfg Co filed Critical Joy Mfg Co
Publication of SE7905381L publication Critical patent/SE7905381L/en

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/042—Threaded

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Food-Manufacturing Devices (AREA)

Abstract

A drill string comprising first and second drill members which are threadedly engaged with each other. Each drill string member has an elongated body and a helical thread on the elongated body. The thread may be roll formed. The helical thread has a helical root portion, a helical crest portion and flank portions interposed between the root portion and the crest portion. The helical crest portion has a maximum radial projection adjacent the flank portions. The helical crest portion has a recess with the maximum depth thereof preferably disposed generally midway between the lateral extremities of the crest portion. The recess may be generally Vshaped and has a maximum depth of about 0.003 to 0.030 inch. In one embodiment, the sidewalls define an angle of about 2 to 20 degrees with respect to a plane passing transversely through the lateral edges of the crest.
SE7905381A 1978-06-22 1979-06-19 DRILL SE7905381L (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US91819578A 1978-06-22 1978-06-22

Publications (1)

Publication Number Publication Date
SE7905381L true SE7905381L (en) 1979-12-23

Family

ID=25439957

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7905381A SE7905381L (en) 1978-06-22 1979-06-19 DRILL

Country Status (4)

Country Link
CA (1) CA1101407A (en)
FI (1) FI791927A (en)
SE (1) SE7905381L (en)
ZA (1) ZA792111B (en)

Also Published As

Publication number Publication date
CA1101407A (en) 1981-05-19
FI791927A (en) 1979-12-23
ZA792111B (en) 1980-05-28

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