Patent ID: 9488024
Filing Date: 2016-11-08
CPC Classification: E21B

Claim Text:
1. A method for abandonment of a subsea well, comprising: fastening a pressure control assembly (PCA) to a subsea wellhead; deploying a tool string into the PCA, wherein the tool string comprises a packer and an upper perforator located above the packer; closing a bore of the PCA above the tool string with a solid barrier, wherein the solid barrier is at least one of: a blowout preventer of the PCA and an isolation valve of the PCA; setting the packer against an inner casing hung from the subsea wellhead at a location adjacent to an outer casing hung from the subsea wellhead; while the PCA bore is closed, perforating a wall of the inner casing above the packer by operating the upper perforator; perforating the inner casing wall below the packer; and injecting cement slurry into an inner annulus formed between the inner casing and the outer casing, wherein: