Tool string

Details Tool string Tool string

2002-03-14

2004-04-06

Bagnell, David (Department: 3672)

Wells

Processes

Operating valve, closure, or changeable restrictor in a well

C166S386000, C166S322000, C166S332300

Reexamination Certificate

active

06715557

ABSTRACT:

BACKGROUND
1. Field of the Invention
This invention pertains to tool strings, and particularly to retrievable tool strings used for underbalanced well completions.
2. Related Art
It is often desirable to isolate a portion of a well. For example, a portion of the well may be isolated during insertion or retrieval of a work string. It may also be desirable to isolate a portion of a well during perforation operations, particularly during underbalanced completion operations.
SUMMARY OF THE INVENTION
The present invention enables the retrieval of a completion string while maintaining control of a well without having to kill the well (i.e., without having to exceed formation pressure) each time the string is retrieved.


REFERENCES:
patent: 3570595 (1971-03-01), Berryman
patent: 3763933 (1973-10-01), Mott
patent: 3796257 (1974-03-01), Hudson
patent: 4253522 (1981-03-01), Setterberg, Jr.
patent: 4372388 (1983-02-01), Skinner
patent: 4651829 (1987-03-01), Hushbeck et al.
patent: 4700777 (1987-10-01), Luers
patent: 4858690 (1989-08-01), Rebardi et al.
patent: 5305833 (1994-04-01), Collins
patent: 6006838 (1999-12-01), Whiteley et al.
patent: 6227298 (2001-05-01), Patel
patent: 6230807 (2001-05-01), Patel
patent: 2 370 052 (2002-06-01), None

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