E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 17/042 (2006.01) F16L 15/06 (2006.01)
Patent
CA 2418126
Male and female coupling members (120, 130) for a drill string (10) are provided. The male and female coupling members have abutment faces (122, 132), fitted with torque reducing rings (124, 135) of low-friction, material, and multi- start threads (140, 150), having higher lead angles .alpha. than conventional coupling threads, to enable uncoupling of the coupling members (120, 130) at reduced torque.
Eléments d'accouplement mâle et femelle (120, 130) conçus pour un train de tiges (10) possédant des faces de butée (122, 132) comportant des bagues de réduction de couple (124, 135) constituées par un matériau à friction limitée, ainsi que des filets (140, 150) présentant des départs multiples et des angles de filets ( alpha ) supérieurs à ceux des filets d'accouplement classiques, ce qui permet de désaccoupler les éléments d'accouplement (120, 130) avec un couple limité.
Haines Todd Andrew
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
LandOfFree
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