Downhole swivel sub
AssigneeTercel Oilfield Products UK Limited
InventorsPaul HOWLETT, James BAIN
Life of this patent
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Abstract
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.
Claims27
A swivel sub for connection in a work string between a workstring and a downhole apparatus, the sub comprising
- a first substantially cylindrical body, including a sleeve portion having one or more first teeth arranged thereon;
- a second substantially cylindrical body being partially located within the sleeve portion and the bodies being arranged to rotate relative to each other;
- a sliding sleeve, including one or more second teeth arranged thereon, to mutually engage with the first teeth;
- the sliding sleeve being axially moveable between a first position, wherein the first and second teeth are disengaged and a second position, wherein the first and second teeth are engaged;
- wherein the first and second bodies include central bores therethrough, such that the sub has a central bore running axially therethrough, and the sliding sleeve is exposed to a first fluid pressure from the central bore of the sub and a second fluid pressure outside the sub;
- and
- wherein the sliding sleeve is moved by virtue of a pressure differential between the first and second pressures.
A swivel sub for connection in a work string between a drill-pipe string and a screen or liner assembly, the sub comprising
- a first substantially cylindrical body, including a sleeve portion having one or more first teeth arranged on a surface thereof;
- a second substantially cylindrical body being partially located within the sleeve portion and the bodies being arranged to rotate relative to each other;
- a sliding sleeve, including one or more second teeth arranged on a surface thereof, to mutually engage with the first teeth;
- the sliding sleeve being axially moveable between a first position, wherein the first and second teeth are disengaged and a second position, wherein the first and second teeth are engaged;
- wherein the first and second bodies include central bores therethrough, such that the sub has a central bore running axially therethrough, and the sliding sleeve is exposed to a first fluid pressure from the central bore of the sub and a second fluid pressure outside the sub;
- and
- wherein the sliding sleeve is moved by virtue of a pressure differential between the first and second pressures.
Dependencies are inferred from the claim text.