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AssigneeHalliburton Energy Services, Inc.
InventorsHenry E. Rogers, Harold O. Treece, Grant L. Hartman
Estimating the term…
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.
Apparatus for maintaining a fluid column in an annulus defined by a first casing cemented in a wellbore and a second casing being lowered through said first casing for placement in said wellbore, the wellbore having a fluid therein, the apparatus comprising:
A method of placing a second casing in a deviated section of a deviated well, the well containing drilling fluid and having a first casing cemented therein, the method comprising:
Apparatus for facilitating the placement of a second casing string in a well containing drilling fluid, the well having a first casing string cemented therein, the apparatus comprising:
Dependencies are inferred from the claim text.