Wells – Processes – Cementing – plugging or consolidating
Patent
1996-07-12
1998-08-11
Bagnell, David J.
Wells
Processes
Cementing, plugging or consolidating
1661774, E21B 3314
Patent
active
057914168
ABSTRACT:
A method of cementing a production casing in a borehole having a surface casing therein wherein cement is pumped down through the production casing thereby cementing the production casing into the borehole and the surface casing. Prior to pumping a special production casing section carrying a tubular expandable resilient bladder is installed in the production casing. The bladder has flanges at either end and slots passing through the flanges. The bladder has an internal thread at one end which mates with an external thread on the casing section thereby anchoring the bladder. The other end of the bladder is free. When installed there is clearance between the bladder and the surrounding surface casing. This permits the bladder to expand upwardly when cement is pumped through and when there is a sufficient head of cement after pumping the bladder collapses and provides a good seal between the production casing section and the surface casing section.
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Mitchell Stephen Bruce
White Kenneth M.
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