Methods and apparatus for completion of well bores

Wells – Processes – Cementing – plugging or consolidating

Reexamination Certificate

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C166S177400, C166S090100

Reexamination Certificate

active

07597146

ABSTRACT:
Methods and devices for completion of well bores and more particularly, to reverse circulation cementing of casing strings in well bores are provided. One example of a method may comprise a method for providing fluidic access to an outer annulus of a casing string within a well bore. One example of a device may comprise a casing hanger, the casing hanger comprising a fluid port wherein the fluid port provides fluidic access to an outer annulus by allowing fluid to pass through the casing hanger; a landing sub attached to the casing hanger; and an isolation device attached to the landing sub wherein the isolation device is adapted to allow fluidic isolation of a portion of the landing sub from a portion of the outer annulus of the well bore.

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