Methods and apparatus for completion of well bores

摘要

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.