Annulus cementing tool for subsea abandonment operation
US9488024B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 2013 |
| Grant date | Nov 8, 2016 |
| Priority date | — |
| Expiry date | Aug 12, 2033 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/11
- WIPO fieldCivil engineering
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.