Isolation system comprising a plug and a circulation valve...

Details Isolation system comprising a plug and a circulation valve... Isolation system comprising a plug and a circulation valve...

2007-05-01

2007-05-01

Tsay, Frank (Department: 3672)

Wells

Processes

Placing or shifting well part

C166S387000, C166S192000

Reexamination Certificate

active

11034228

ABSTRACT:
An isolation system for an oil and gas well is described wherein the system comprises an isolation section and a first isolation device integral with the section and a second isolation device sealingly engaged to the section. The first isolation device may be a pressure-actuated valve and the second isolation device may be a plug.

REFERENCES:
patent: 3757816 (1973-09-01), Price
patent: 4694903 (1987-09-01), Ringgenberg
patent: 5890540 (1999-04-01), Pia et al.
patent: 6662877 (2003-12-01), Patel
patent: 7055598 (2006-06-01), Ross et al.
patent: 2002/0033262 (2002-03-01), Musselwhite et al.
patent: 2004/0084190 (2004-05-01), Hill et al.

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