Inflatable packer assembly

Details Inflatable packer assembly Inflatable packer assembly

2008-02-05

2009-08-25

Gay, Jennifer H (Department: 3676)

Wells

Packers or plugs

Spaced sealing portions

C166S387000

Reexamination Certificate

active

07578342

ABSTRACT:
Conventional formation evaluation with dual inflatable packers includes the steps of pressurizing the packers so as to isolate an annular portion of the borehole wall, collecting one or more samples of formation fluid via the isolated portion of the borehole wall, and depressurizing the packers so as to permit movement of the mandrel within the borehole. A sampling method and apparatus that utilize one or more of the following to advantage is provided: restricting deformation of the packers during inflation using an annular bracing assembly; actively retracting the packers using ambient borehole pressure; and substantially centralizing the mandrel intermediate the packers so as to resist buckling of the mandrel.

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