Debris cap
AssigneeFMC Technologies, Inc.
InventorsRichard Blair, William Crawford, Martin Forsyth, Graeme J. Collie, Kevin N. Hannigan
Life of this patent
Estimating the term…
Abstract
An ROV, wireline or diver installed subsea xmas tree debris cap has an integral corrosion inhibitor/biocide provided in the form of a solid block which is wrapped in a water soluble membrane bag. The block is suspended inside the debris cap in a basket or perforated container. After installation of the debris cap, the membrane and solid block will dissolve and sanitize the stagnant water, thereby protecting all materials from corrosion for a number of years. The debris cap also includes an environmental seal in the form of a single O ring. Furthermore, the debris cap is simplified in that it does not include a conventional debris cap-to-xmas tree lockdown mechanism.
Claims15
A debris cap for a subsea xmas tree or a wellhead, the debris cap comprising:
- a container which is supported directly by the debris cap and which is pre-charged with at least one of a corrosion inhibitor and a biocide prior to installation of the debris cap on the xmas tree or the wellhead;
- wherein after installation the debris cap is directly supported on the xmas tree or the wellhead;
- and
- wherein the at least one of the corrosion inhibitor and the biocide is released into a stagnant volume enclosed beneath the debris cap following installation of the debris cap on the xmas tree or the wellhead.
A debris cap for a subsea xmas tree or a wellhead, the debris cap comprising:
- a container which is pre-charged with at least one of a corrosion inhibitor and a biocide prior to installation of the debris cap on the xmas tree or the wellhead;
- wherein after installation the debris cap is supported on the xmas tree or the wellhead;
- wherein the at least one of the corrosion inhibitor and the biocide is released into a stagnant volume enclosed beneath the debris cap following installation of the debris cap on the xmas tree or the wellhead;
- and
- wherein the debris cap is frictionally retained on the xmas tree or the wellhead without the use of a lockdown mechanism.
A debris cap for a subsea xmas tree or a wellhead, the debris cap comprising:
- a container which is pre-charged with at least one of a corrosion inhibitor and a biocide prior to installation of the debris cap on the xmas tree or the wellhead;
- wherein after installation the debris cap is supported on the xmas tree or the wellhead;
- wherein the at least one of the corrosion inhibitor and the biocide is released into a stagnant volume enclosed beneath the debris cap following installation of the debris cap on the xmas tree or the wellhead;
- and
- wherein the debris cap further comprises an O ring environmental seal which engages the xmas tree or wellhead.
A debris cap for a subsea xmas tree or a wellhead, the debris cap comprising:
- a container which is pre-charged with at least one of a corrosion inhibitor and a biocide prior to installation of the debris cap on the xmas tree or the wellhead;
- wherein after installation the debris cap is supported on the xmas tree or the wellhead;
- wherein the at least one of the corrosion inhibitor and the biocide is released into a stagnant volume enclosed beneath the debris cap following installation of the debris cap on the xmas tree or the wellhead;
- and
- wherein the at least one of the corrosion inhibitor and the biocide comprises a solid block and the debris cap further comprises at least one of a perforated container and a wire basket for holding the solid block.
A debris cap for a subsea xmas tree or a wellhead, the debris cap comprising:
- a container which is pre-charged with at least one of a corrosion inhibitor and a biocide prior to installation of the debris cap on the xmas tree or the wellhead;
- wherein after installation the debris cap is supported on the xmas tree or the wellhead;
- wherein the at least one of the corrosion inhibitor and the biocide is released into a stagnant volume enclosed beneath the debris cap following installation of the debris cap on the xmas tree or the wellhead;
- and
- wherein the debris cap further comprises at least one finger for frictionally gripping the xmas tree or wellhead.
A debris cap for a subsea xmas tree or a wellhead, the debris cap comprising:
- a container which is pre-charged with at least one of a corrosion inhibitor and a biocide prior to installation of the debris cap on the xmas tree or the wellhead;
- wherein after installation the debris cap is supported on the xmas tree or the wellhead;
- wherein the at least one of the corrosion inhibitor and the biocide is released into a stagnant volume enclosed beneath the debris cap following installation of the debris cap on the xmas tree or the wellhead;
- and
- wherein the debris cap further comprises a central boss and a surrounding hood.
A debris cap for a subsea xmas tree or a wellhead, the debris cap comprising:
- a container which is pro-charged with at least one of a corrosion inhibitor and a biocide prior to installation of the debris cap on the xmas tree or the wellhead;
- wherein after installation the debris cap is supported on the xmas tree or the wellhead;
- wherein the at least one of the corrosion inhibitor and the biocide is released into a stagnant volume enclosed beneath the debris cap following installation of the debris cap on the xmas tree or the wellhead;
- and
- wherein the debris cap is molded from a plastic material.
Dependencies are inferred from the claim text.