Annulus cementing tool for subsea abandonment operation
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United States of America Patent
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Nov 8, 2016
Grant Date -
Oct 17, 2013
app pub date -
Feb 26, 2013
filing date -
Apr 16, 2012
priority date (Note) -
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Abstract
A method for abandonment of a subsea well includes: fastening a pressure control assembly (PCA) to a subsea wellhead; and deploying a tool string into the PCA. The tool string includes a packer and an upper perforator located above the packer. The method further includes: closing a bore of the PCA above the tool string with a solid barrier; and setting the packer against an inner casing hung from the subsea wellhead. The method further includes, while the PCA bore is closed, perforating a wall of the inner casing by operating the upper perforator. The method further includes injecting cement slurry into an inner annulus formed between the inner casing and an outer casing hung from the subsea wellhead.
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