E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 33/12 (2006.01) E21B 23/06 (2006.01) E21B 33/129 (2006.01)
Patent
CA 2190899
A retrievable packoff assembly for temporarily sealing a well pipe and anchoringequipment at a subsurface location within the pipe. The assembly is connected toa tubular actuation tool which is manipulated from the surface to position the assembly at a subsurface well location, set the assembly and then release from the set assembly. Right-hand tool rotation sets the assembly, releases the tool, and is subsequently employed to reengage and unset the assembly for retrieval to the surface. A bypass flow passage in the assembly is controlled by a sliding sleevevalve which is automatically closed by the right-hand tool rotation during setting and release and automatically reopened by tool rotation occurring during retrieval of the assembly. Flow through both the assembly and the bypass is confined within the actuation tool. A control flow passage in the apparatus is sealed by a retrievable blanking plug which may be removed to permit passage of equipment through the anchored assembly. The sealed assembly holds pressure from above or below. Drillpipe or other equipment may be supported in the well pipe by the set assembly.
Hennig Gregory E.
Martin David
Mccorry Mark
Baker Hughes Incorporated
Sim & Mcburney
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