Designing for HPHT conditions presents a number of engineering challenges which can push conventional subsea technology designs to their limits. For riser systems high pressure and high temperature conditions can require substantial pipe wall thickness, which lead to complications with total system weight and excessive interface loading.

Extreme sour service conditions are also often associated with HPHT reservoirs. To overcome this, additional material corrosion allowances or pipe cladding can be necessary, adding further to the overall system weight, and presenting added complexity for offshore riser and flowline fabrication processes. For flexible riser systems, high temperatures also present design challenges due to the use of thermoplastic polymers in the design of the flexible riser structure.

2H have been closely involved with the design of riser systems for HPHT developments. These have included high pressure drilling risers for jack-up platforms in harsh environments, as well as deepwater production riser systems in the Gulf of Mexico and West Africa which are combined with stringent sour service requirements. 2H have the experience and technical capability to develop the solutions required for the most challenging HPHT applications, and together with Acteon Group sister companies Claxton and SRP, have initiated a HPHT Subsea Community to aid the industry as a whole to deliver successful HPHT developments