METHODS AND APPARATUS FOR REVERSE CIRCULATION CEMENTING OF CASING STRINGS IN WELLBORES

摘要

Methods and devices for completion of well bores and more particularly, t o reverse circulation cementing of casing strings in well bores are provided . One example of a method may comprise a method for providing fiuidic access to an outer annulus of a casing string within a well bore. One example of a device may comprise a casing hanger (110), the casing hanger comprising a f luid port (120) wherein the fluid port provides fiuidic access to an outer a nnulus (150) by allowing fluid to pass through the casing hanger; a landing sub (130) attached to the casing hanger; and an isolation device (140) attac hed to the landing sub wherein the isolation device is adapted to allow fiui dic isolation of a portionof the landing sub from a portion of the outer ann ulus of the well bore.