Downhole method using multiple plugs

Details Downhole method using multiple plugs Downhole method using multiple plugs

2007-07-27

2009-06-30

Gay, Jennifer H (Department: 3676)

Wells

Processes

Placing or shifting well part

C166S382000, C166S176000, C166S153000

Reexamination Certificate

active

07552779

ABSTRACT:
A system allows for sequential treatment of sections of a zone. Access to each portion can be with a sliding sleeve that has a specific internal profile. Pump down plugs can be used that have a specific profile that will make a plug latch to a specific sleeve. Pressure on the plug when latched allows a sequential opening of sleeves while zones already affected that are below are isolated. The pump down plugs have a passage that is initially obstructed by a material that eventually disappears under anticipated well conditions. As a result, when all portions of a zone are handled a flow path is reestablished through the various latched plugs. The plugs can also be blown clear of a sliding sleeve after operating it and can feature a key that subsequently prevents rotation of the plug on its axis in the event is later needs milling out.

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