Patent ID: 8939212
Filing Date: 2015-01-27
Classification: E21B

Abstract:
1. A method of protecting the top of a subsea structure during temporary abandonment, the method comprising the steps of: capping the subsea structure with a temporary abandonment cap comprising at least one port into the top of the subsea structure and attached to said port at least one removable and replaceable canister containing material to provide protection to the top of the subsea structure through said port; allowing the material in the canister to release into the top of the subsea structure through the port while the cap is resting on the subsea structure; after the material has likely been diluted or depleted from the top of the subsea structure, replacing the canister with another canister containing material to provide protection to the top of the subsea structure, without removing the subsea cap from its resting position on the subsea structure; and allowing the material in said another canister to release into the top of the subsea structure through the port while the cap is resting on the subsea structure.