Formation saver sub and method

Details Formation saver sub and method Formation saver sub and method

2011-04-12

2011-04-12

Gay, Jennifer H (Department: 3676)

Wells

Processes

Operating valve, closure, or changeable restrictor in a well

C166S168000, C166S328000, C166S383000

Reexamination Certificate

active

07921922

ABSTRACT:
A formation saver sub or pump out sub incorporating an anti-surge feature. The sub includes a body, a mandrel, a piston (or an annulus fluid pressure chamber and a tubular pressure chamber), a sleeve, a spring, a releasable seat, and a plug. The plug and seat are released from the sub when one or more dogs releasably positioning the seat in the mandrel bore disengages from the seat due to a bleed off of fluid pressure in the well bore.

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