Apparatus and method for temporary subsurface well sealing and e

Details Apparatus and method for temporary subsurface well sealing and e Apparatus and method for temporary subsurface well sealing and e

1995-11-22

1997-12-16

Dang, Hoang C.

Wells

Processes

Placing or shifting well part

166124, 166129, 166133, 166330, 1663322, 166386, E21B 2306, E21B 3412

Patent

active

056974493

ABSTRACT:
A retrievable packoff assembly for temporarily sealing a well pipe and anchoring equipment at a subsurface location within the pipe. The assembly is connected to a 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 sleeve valve 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. Drill pipe or other equipment may be supported in the well pipe by the set assembly.

REFERENCES:
patent: 2384192 (1945-09-01), Otis et al.
patent: 3171491 (1965-03-01), States
patent: 3232347 (1966-02-01), Thrane
patent: 3306366 (1967-02-01), Muse
patent: 3465820 (1969-09-01), Kisling, III
patent: 3543849 (1970-12-01), Kilgore
patent: 4598774 (1986-07-01), Nevels et al.
Baker Oil Tools, Remedial and Stimulation, 1994, pp. 13, 18 and 19.

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