Equipment to reduce torque on a drill string

Details Equipment to reduce torque on a drill string Equipment to reduce torque on a drill string

E - Fixed Constructions

21

B

E21B 17/10 (2006.01)

Patent

CA 2169544

A drill string torque-reducing sub-assembly is disclosed comprising: a hollow longitudinally-extending mandrel (1) capable of being coupled between adjacent first and second drill pipes in the drill string; and a sleeve (2) capable of freely rotating about the mandrel (1), the sleeve having an external diameter (18) intended to be larger than that of any connection component of the first or second drill pipe, and the sleeve (2) being prevented by means (16) mounted internally of the sleeve from longitudinal displacement relative to the mandrel (1). The sub-assembly can induce torque in a drill string, by reducing frictional losses between the wellbore and the rotating components in the drill string.

L'invention concerne un sous-assemblage servant à réduire le couple d'une colonne de forage, et comprenant: un mandrin creux (1) s'étendant longitudinalement et pouvant être couplé entre les première et seconde tiges de forage adjacentes de la colonne; ainsi qu'un manchon (2) à libre rotation autour du mandrin (1), son diamètre externe (18) étant conçu de manière à être supérieur à celui de n'importe quel composant de raccordement des première et seconde tiges de forage, ledit manchon (2) étant empêché par des moyens (16) montés à l'intérieur de lui-même de se déplacer longitudinalement par rapport au mandrin (1). Ce sous-assemblage peut réduire le couple dans une colonne de forage en diminuant les pertes par friction entre le trou de forage et les composants rotatifs de la colonne de forage.

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