E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 49/04 (2006.01) E21B 17/07 (2006.01) E21B 47/01 (2006.01) F16F 1/40 (2006.01)
Patent
CA 2084836
The present disclosure is directed to a shock absorbing device for threading in a tubing string for running delicate instruments into a well borehole where they are in near proximity to explosives which might otherwise be detonate. This particularly is important in a well borehole which is filled with a standing column of liquid which transmits the shock waves quite readily. This is a separate assembly which can be threaded in the tubing string and has a pin and box connection for that. Moreover, it is formed of an outer mandrel surrounding connected inner upper and inner lower mandrels; the inner mandrels define annular spaces for receiving shock absorbers defined by alternating thin layers of metal and rubber; the metal and rubber washers have different shock wave impedances and tend therefore to absorb shock waves traveling either upwardly or downwardly in the well borehole.
Cette invention concerne un amortisseur de choc à visser dans une colonne de tubes pour la protection d'instruments délicats placés dans un puits de forage à proximité d'explosifs susceptibles d'éclater. Ce dispositif est particulièrement important dans un puits rempli de liquide de forage qui transmet très bien les ondes de choc. Il s'agit d'un dispositif distinct à visser dans la colonne de tubage et qui comporte un embout approprié à cette fin. De plus, il se compose d'un mandrin extérieur entourant deux mandrins intérieurs superposés et raccordés l'un à l'autre. Les deux mandrins intérieurs définissent des espaces annulaires destinés à loger des éléments d'amortissement des ondes de choc prenant la forme d'anneaux alternés de métal et de caoutchouc qui ont une impédance différente et tendent donc à absorber les ondes de choc progressant soit vers le haut soit vers le bas dans le puits.
Halliburton Logging Services Inc.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
LandOfFree
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