Subsea Landing String System

A marine drilling riser is a pipe that provides a temporary extension from a floating drilling vessel to an offshore well to enable well intervention operations. Landing strings are in-riser systems which contain a subsea test tree within a BOP (blow out preventer) allowing well operations to be conducted safely from floating vessels. The test tree provides the ability to rapidly shut-in the well and disconnect the vessel in case of emergency should conditions require. A valve arrangement is contained within the system, above the BOP shear rams, ensuring the landing string contents are isolated upon disconnect.

The Subsea Landing String System is an assembly of large bore hydraulically controlled valves for through-riser completion installation and intervention. The valves provide enhanced cutting and post-cut sealing capabilities with the ability to rapidly isolate the well. The innovative design delivers superior performance at a fraction of the cost of conventional systems.

Features Benefits
Fewer, simpler components and stronger fit-for-purpose design.
  • Minimises cost.
  • Improves reliability.
  • Reduced lead time.
Separates cutting and sealing components in a single device.
  • Eliminates risk of damage to the seal during cutting giving unparalleled post-cut sealing performance.
Rotary actuators.
  • Eliminates binding and maximises cutting torque.
External actuators.
  • Separates controls from wellbore environment.
  • Ensures rapid closure.
Resilient well bore sealing.
  • Enables use in high pressure and high temperature applications.
  • Provides explosive decompression resistance.
Compact and lightweight design.
  • Facilitates installation in short BOP’s.
  • Allows additional or alternative valve functions to be incorporated.
Common flanged connection.
  • Improves structural integrity including fatigue capacity.
  • Reduces cost.
Cutting Capability
Slickline. Up to 10 off 0.160”.
Braided Cable. Up to 2 off 0.520”.
Coiled Tubing. Up to 2 3/8” x 0.204”.
Revolution Valve Cut Samples
Bore. 7 3/8”. 187 mm. 6 3/8”. 162 mm. 5 1/2”. 140 mm.
Working Pressure. 10,000 psi. 690 bar. 15,000 psi. 1 034 bar. 20,000 psi. 1 379 bar.
Structural Components. Low Alloy Steel. Low Alloy Steel. Inconel.
Standard on all Systems
Temperature Range. 0°F to 350°F. -18°C to 180°C.
Hydraulic Pressure. 10,000 psi. 690 bar.