Tercel Oilfield Products UK Limited

Caledus Limited

James Bain

Paul David Howlett

The present invention provides a swivel sub for connection in a work string between a workstring and a downhole apparatus. The swivel sub includes a first substantially cylindrical body, including a sleeve portion having one or more teeth and a second substantially cylindrical body being partially located within the sleeve portion. The bodies are arranged to rotate relative to each other. The swivel sub also includes a sliding sleeve, having one or more teeth 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. Further, the present invention provides methods for of running the tool, with particular application to setting and hanging of liners and screens.

Downhole swivel sub

A tubing shoe () for use on work strings in well bores as are typically utilised in oil and gas production. The shoe comprises a cylindrical body () upon which is arranged a reaming portion () including pairs of teardrop shaped raised reaming members (), each pair being mounted oppositely, in parallel and longitudinally along the body. Adjacent pairs of members provide a funnel () for collecting approaching debris and a channel for grinding the debris. A nose () may be mounted on the end of the shoe, the nose being eccentric or including cutting blades to assist the shoe in breaking through shale and clay stone bridges. A non-aggressive stabiliser () in the form of helically arranged blades may also be located on shoe.

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Angus, United Kingdom

James Bain