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US 6,719,046 B2Granted
Apparatus for controlling the annulus of an inner string and casing string
OwnerAlbert Augustus Mullinsinventor
Life of this patent
Estimating the term…
Abstract
A apparatus is disclosed for attaching and sealing to the upper end of the casing allowing the inner string to be run through the apparatus. The apparatus provides a latch for anchoring the inner string and a seal for sealing on the inner string. Also disclosed is a flow path for providing for circulation of fluid between the inner string and casing annulus. Also disclosed is an inner string sub that provides a profile anchoring and sealing the inner string by the apparatus.
Claims18
An apparatus for controlling the annulus between an outer and an inner string, comprising:
- a sleeve secured to the outer string and having a central passage selectively large enough to allow passage of the inner string and selectively operated to seal around said inner string in said passage for closing the annulus.
Dependencies are inferred from the claim text.