Method and apparatus for maintaining a fluid column in a...

Details Method and apparatus for maintaining a fluid column in a... Method and apparatus for maintaining a fluid column in a...

E - Fixed Constructions

21

B

E21B 43/10 (2006.01) E21B 23/00 (2006.01) E21B 33/13 (2006.01) E21B 33/136 (2006.01) E21B 33/14 (2006.01)

Patent

CA 2428008

A method and apparatus for maintaining the fluid column in an annulus are provided. The fluid column support, or fluid column seal is disposed about a second casing being lowered into a well through a first casing already cemented in the well. The fluid column support includes a seal connected to the second casing that engages the first casing as it is lowered therethrough. The seal will allow flow in an upward direction but prevents downward flow. The seal will support, or maintain a fluid column in the annulus between the first and second casing in the event that the fluid level below the seal drops for any reason, such as lost circulation or the failure of a buoyancy chamber in the second casing. The fluid seal, in conjunction with stage tools, provides hydrostatic pressure in the well to maintain proper fluid placement therein.

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