E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/17
E21B 33/16 (2006.01)
Patent
CA 1335878
The invention provides a liner closure formed by an upper wiper and a plug therein and a lower wiper used for conducting cement through a liner to a well bore which closure closes off between the liner and the well bore, said closure including: a catcher within the liner; means on said catcher to engage and latch the lower wiper therewith after it has moved into the liner; means to engage a plug with the upper wiper; and means to position the upper wiper and plug therein with the lower wiper in said catcher to close off between the liner and the well bore. Also provided is a method of closing off an opening in a liner by employing a catcher in the liner to engage a lower wiper for receiving an upper wiper with a plug therein used for conducting cement through the liner to be discharged through the opening to the well bore, said method comprising the steps of: moving the lower wiper into the liner to engage with the catcher; and moving the upper plug and engaged wiper into the liner to position the upper plug and wiper with the lower wiper engaged in the catcher.
616648
Riches Mckenzie & Herbert Llp
Texas Iron Works Inc.
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