Riserless abandonment operation using sealant and cement
US10214988B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 17, 2016 |
| Grant date | Feb 26, 2019 |
| Priority date | — |
| Expiry date | Aug 6, 2036 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/035
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method for abandonment of a subsea well includes: setting a packer of a lower cementing tool against a bore of an inner casing hung from a subsea wellhead; fastening a pressure control assembly (PCA) to the subsea wellhead; hanging an upper cementing tool from the PCA and stabbing the upper cementing tool into a polished bore receptacle of the lower cementing tool; perforating a wall of the inner casing below the packer; perforating the inner casing wall above the packer by operating a perforator of the upper cementing tool; mixing a resin and a hardener to form a sealant; and pumping a fluid train through bores of the cementing tools and into an inner annulus formed between the inner casing and an outer casing hung from the subsea wellhead. The fluid train includes the sealant followed by a cement slurry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.