Straddle packer systems

Details Straddle packer systems Straddle packer systems

2005-04-26

2005-04-26

Bagnell, David (Department: 3672)

Wells

Processes

Placing fluid into the formation

C166S191000, C166S387000, C166S177500, C166S053000

Reexamination Certificate

active

06883610

ABSTRACT:
The present invention relates to straddle packer systems and methods of using them for downhole isolation of zones for fracturing treatment. More specifically, the system includes upper and lower seal systems having resiliently flexible sealing elements hydraulically and operatively connected to one another which are responsive to an increase in hydraulic pressure for setting the sealing elements at a first hydraulic pressure threshold. Additionally, the system includes a control system hydraulically and operatively connected between the upper and lower packer systems which is responsive to an increase in hydraulic pressure at a second hydraulic pressure threshold higher for activating a pressure switch system within the control system for opening at least one frac valve in the control system.

REFERENCES:
patent: 2738014 (1956-03-01), Lynes
patent: 2776014 (1957-01-01), Lee et al.
patent: 3382930 (1968-05-01), Ribb et al.
patent: 5000265 (1991-03-01), Pleasants et al.
patent: 5277253 (1994-01-01), Giroux et al.
patent: 5295393 (1994-03-01), Thiercelin
patent: 5501281 (1996-03-01), White et al.
patent: 5782306 (1998-07-01), Serafin

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