Pressure-Energized Door Seal:
Pressure differentially energized modular door seal. As wellbore pressure increases, the differential area between the door face seal and radial seals force the modular carrier towards the BOP door face.
The higher the wellbore pressure, the tighter the modular carrier is forced toward the BOP door face.
Modular door seal utilizes a secondary seal to maintain external pressure integrity. This is ideally suited for subsea use in the event wellbore pressure drops below external hydrostatic pressure; the secondary seal prevents the hydrostatic pressure from de-energizing the modular door seal.
Corrosion resistant material is utilized in the door cartridge seal groove.
This feature introduces replaceable parts to the cavity to eliminate extensive in-shop repairs and post weld heat treatments. The seal seat, skid plate and side pads can be replaced upgrading the BOP cavity tolerances to as new condition.
Shaffer engineers have extended the capabilities of shear rams with a casing shear ram which meets the specific cutting needs to physically shear casing tubulars up to 13" in an 18¾" bore BOP.
Type CVX Shear Ram:
The type CVX Shear Ram enhances the features of NOV's Shaffer Shear Ram family, assuring multiple shear and sealing sequences while hung off in a cavity below the shear ram cavity. No additional force is required to manipulate the fish. This multiple shear and seal capability enhances shear ram reliability and extends the length of BOP stack deployment. Type CVX Shear Rams are capable of shearing at 20% lower pressures than conventional shear rams.
CVX Shear Rams are designed for durability and convenience, and provides the reliable performance that today's BOP equipment demands. The CVX Shear Rams are offered for large bore, high pressure BOPs.