Deep water drilling riser pressure relief system
AssigneeMhwirth AS
InventorDag Vavik
Life of this patent
Estimating the term…
Abstract
A deep water drilling riser pressure relief system includes a drilling riser extending from a surface down to a BOP stack arranged subsea. The drilling riser comprises a drilling riser slip joint, an annular preventer arranged below the drilling riser slip joint, and at least one pressure relief device arranged in a lower part of the drilling riser. The at least one pressure relief device is configured to open so as to discharge a fluid from the drilling riser to the sea if a pressure difference between an inside and an outside of the drilling riser exceeds a predetermined threshold.
Claims11
A deep water drilling riser pressure relief system comprising:
- a drilling riser extending from a surface down to a BOP stack arranged subsea, the drilling riser comprising,
- a drilling riser slip joint,
- an annular preventer arranged below the drilling riser slip joint, and
- at least one pressure relief device arranged in a lower part of the drilling riser,
- wherein,
- the at least one pressure relief device is configured to automatically open so as to discharge a fluid from the lower part of the drilling riser to the sea if a pressure difference exceeds a pre-determined pressure threshold, and
- the predetermined pressure threshold does not exceed a maximum working allowable pressure of the lower part of the drilling riser, the maximum working allowable pressure being a difference between an inside pressure of the lower part of the drilling riser and a hydrostatic water pressure on an outside of the lower part of the drilling riser.
Dependencies are inferred from the claim text.