System and method for preventing cross-flow between...

Details System and method for preventing cross-flow between... System and method for preventing cross-flow between...

2004-07-30

2010-02-23

Gay, Jennifer H (Department: 3676)

Wells

Processes

Placing or shifting well part

C166S319000, C166S332800, C166S374000, C166S191000

Reexamination Certificate

active

07665536

ABSTRACT:
In general, a system and valve is provided to prevent the cross flow between formations during the shut-in period of a well intersecting at least two formations, with flow from at least one of the formations being controlled by a multi-position valve. In one embodiment, the system comprises a cross-flow prevention valve that automatically closes and then opens during each cycle of the multi-position valve. In another embodiment, the cross-flow prevention valve is activated by the same control line used to activate the multi-position valve.

REFERENCES:
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patent: 6227298 (2001-05-01), Patel
patent: 6328109 (2001-12-01), Pringle et al.
patent: 6668935 (2003-12-01), McLoughlin et al.
patent: 6668936 (2003-12-01), Williamson et al.
patent: 6997263 (2006-02-01), Campbell et al.
patent: 2002/0023746 (2002-02-01), Ringgenberg et al.

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