HPHT Drilling Riser Systems
This award-winning new 12,200psi design uses a shrink-fit flange to negate many of the issues inherent in working with HPHT-grade riser materials.
Our new technology enables the drilling of HPHT wells from a standard Jack Up - at a stroke enhancing the economics of HPHT projects.
Claxton, along with Acteon group sister companies, 2H Offshore and SRP, are proud to supply a unique and award-winning High-Pressure High-Temperature (HPHT) riser system.
The award-winning design uses a shrink-fit flange to negate many of the issues inherent in working with HPHT-grade riser materials.
Features:
- The world’s first API NACE compliant full-bore (18 ¾”) access riser capable of working at pressures in excess of 12,000psi
- The world’s first attachment of flanges to a riser by shrink fit process
- Allows high pressure wells to be drilled by a standard jack-up rig with a surface BOP, avoiding the need for a floating vessel with subsea BOP
Shrink Fit Flange:
- Based on well established physical principles.
- Contact friction and machined profile give load capacity.
- Mechanical back-up with capacity greater than pipe sections.
- The seal mechanism is enhanced as the riser internal pressure increases.
- Shrink fit gives excellent fatigue performance – no weld and low stress concentration.
Shrink Fitting:
- Induction coils are wrapped around the flange which is then insulated.
- Flange heated up using induction coils.
- Cold pipe is then inserted in the flange in a carefully controlled operation
- Once the flange cools a super-strong connection with the pipe is created - negating the need to well HPHT-grade materials.