Offshore staff
ABERDEEN, UK – Interventek has introduced an in-riser subsea landing string system.
Revolution-7, a 7-in. nominal, 10,000-psi (689-bar) rated system, features the company’s Revolution safety valve and PowerPlus technology, a locally integrated, gas-accumulated power source said to provide failsafe valve actuation in under one second.
The landing string comprises lower and upper subsea test tree valves, a latch, a retainer valve and lubricator valve. A slick joint, shear sub and adaptors enable space-out in the BOP and an interface with the tubing hanger running tool and landing string tubulars.
System components are integrated via pre-loaded connections.
Revolution-7 has undergone testing to meet the latest API 17G 3rd edition industry specifications.
The valve can perform cutting and sealing operations in a single rotation, reducing the need (according to Interventek) for the customary secondary valve to provide a post-cut seal.
The system is said to be suitable for deployment in all BOPs and can incorporate additional or alternative valve functions.
For subsea well completion, intervention, workover or decommissioning operations, a landing string is deployed from a floating vessel, via a marine riser. The landing string system includes a subsea test tree which provides the capability to close in the well, cut any medium in the bore and disconnect in an emergency.
The shear-and-seal Revolution valve technology used is also said to be compatible with open water, tree-on-tree abandonment and surface applications.
10/20/2021
