The Airlock®G casing buoyancy sub offers the same functionality as our original NCS Airlock® system, which recently surpassed 10,000 runs. The AirLock® G buoyancy sub contains a pressure barrier that allows the vertical casing section to be filled with fluid, while the lateral section remains air-filled and buoyant, reducing friction by as much as 50%.
Airlock® G operation is simple and passive. The buoyancy sub is installed in the casing string at a location calculated to provide the optimum balance of lateral buoyancy and the weight of the vertical fluid.
Our Most Advanced System Ever Created
The sub houses a high-strength, glass disk supported by a calibrated shear ring. After casing lands, increased surface pressure causes the disk to shatter and diffuse into the well fluid, leaving a full-drift ID. Circulation and cementing operations proceed as normal.