Main features of the MC2 compact wellhead are described below:

• Flow through casing hanger with 45 degree shoulders and centralisation feature.
• "Fastlock" hub and metal/metal "CX" gasket on wellhead connections.
• Non API shear and bending resistant outlets with parallel thread metal sealing VR plug.
• 2" ´ 5000 psi outlets for both upper and lower stages.
• Minimum number of external dedicated test ports.
• Retrievable seal assemblies with positive lockdown, eliminating tiedown screws.
• Coarse Acme running threads.
• Identical seal assemblies between casing and tubing hangers with metal end capped elastomeric seals.
• Coupling like tonguing necks on all hangers and housings. Overall heights include 6" long tonguing neck on housings which, in reality, may be omitted from the stackup height.
• QA requirements to PSL 3 Temperature "U", Material Class "DD". API 6A, 16th Ed.

Differences between the 7 1/16" and 9" nominal compacts

1. The through bore for the 7 1/16" compact is 6.65" minimum to allow for a 6 5/8" bit. This enables sufficient landing shoulder of approximately 1/8" per side to cater for the combined loads of 5 1/2" casing, 3 1/2" tubing as well as BOP test loads. The loading capacity exceeds 400,000 lbs - this is easily capable of supporting the anticipated loading.

2. The 9" nom compact allows full bore access into the lightest of 7 5/8" casings without any load restrictions that could be foreseen as a problem.

3. BOP protection will be either 7 1/16" or 11" nominal BOPs.