Subsea Precommissioning and Commissioning
Recent innovations have led to the incorporation of the Denizen™ remote subsea flooding unit into the Weatherford SPCS™ subsea pipeline commissioning system. The Denizen unit can be deployed to the seabed and hooked up within three hours, saving clients up to a day at either side of one pipeline system. This advantageous approach reduces work hours and the need for expensive support vessels.
Featuring a pumping package connected to the base plate of a remotely operated vehicle (ROV), the patented Denizen unit is lowered to the seafloor and connected to the flowline, using hot stabs. The unit is operated remotely from the surface and uses the hydraulic circuitry of the ROV to control pump speed.
Once in place, the Denizen unit can introduce fluids and hydrostatically test and dewater pipelines. Precommissioning data, such as pressure, temperature and flow, are collated by a data logger and relayed in real time through the ROV umbilical to the surface. For contingency purposes, the data logger is equipped with a memory backup.
As operators continue to move into ultra-deepwater, the requisite larger equipment spreads, downlines and crews make precommissioning work increasingly costly. The Denizen unit avoids the expense and complexity of a large dynamically positioned (DP) II support vessel with a large equipment spread and downline to perform precommissioning operations.
With the Denizen unit, Weatherford routinely provides subsea services at a depth of 10,000 ft (3,000 m) and at pressures up to 20,000 PSI (1,400 BAR) absolute, while ensuring safer operations, simpler logistics and considerable time and cost savings.
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