Downhole swivel sub

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 17/05 (2006.01)

Patent

CA 2604438

A swivel sub (10) for connection in a work string between a workstring and a downhole apparatus is disclosed. The sub has a first substantially cylindrical body (12), including a sleeve portion (22) having one or more teeth (46) and a second - substantially cylindrical body (28) being partially located within the sleeve portion. The bodies are arranged to rotate relative to each other. A sliding sleeve (48), having one or more teeth (56) arranged mutually engage with the first teeth is axially moveable between disengaged and engaged positions, in one embodiment by a pressure differential being created in the sub. Methods of running the tool are described, with particular application to setting and hanging of liners and screens. The invention also offers advantages for drilling applications.

Cette invention concerne un raccord de tête d'injection conçu pour être raccordé dans un train de tiges entre un train de tiges et un appareil de fond de trou. Ce raccord comprend un premier corps essentiellement cylindrique, comportant une partie manchon munie d'une ou de plusieurs dents, et un second corps essentiellement cylindrique placé partiellement dans la partie manchon. Ces corps sont disposés de façon à tourner l'un par rapport à l'autre. Un manchon coulissant, pourvu d'une ou de plusieurs dents venant en prise avec les premières dents, peut être déplacé axialement entre une position engagée et une position libérée, dans un premier mode de réalisation sous l'effet d'un différentiel de pression créé dans ledit raccord. Dans cette invention sont décrits des procédés d'utilisation de cet outil, avec application particulière pour fixer et suspendre des colonnes perdues et des tubes filtres. Cette invention offre également des avantages pour des applications de forage.

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