F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
64/20, 255/56
F16L 15/00 (2006.01) E21B 17/042 (2006.01)
Patent
CA 1317281
Abstract The present invention relates to a thread coupling including at least one male thread (10) and one female thread (17), said male thread (10) being arranged upon a spigot (11) that constitutes an integral part of a first drill string element (12), and said drill string element (12) at the inner end of said spigot (11) being provided with a shoulder (13) that has a contact surface (14) directed towards the free end of the spigot (11), said female thread (17) being a part of a coupling sleeve (18) that is connected to a second drill string element (19), and the coupling sleeve (18) being provided with an internal stop surface (20). In thread couplings between drill string elements either so-called bottom stops or so-called shoulder stops are used, said principles per se having disadvantages as to stresses, energy transfer and so on. The characteristic of the present invention is the combination of a bottom and a shoulder stop in a thread coupling.
604535
Gowling Lafleur Henderson Llp
Sandvik Intellectual Property Ab
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