Siem WIS, Statoil qualify new technology for managed pressure drilling

Siem WIS has tested and qualified its pressure control device (PCD) technology together with Statoil’s control system for managed pressure drilling (MPD).

Offshore staff

KRISTIANSAND, Norway -- Siem WIS has tested and qualified its pressure control device (PCD) technology together with Statoil’s control system for managed pressure drilling (MPD). The two-week test was financed by Statoil and was conducted at the International Research Institute of Stavanger’s test facilities.

Together, Siem WIS’ PCD seal package and Statoil’s control system for MPD enable closed loop drilling operations. Both technologies are now qualified for commercial operation after meeting test criteria.

The control system for automatic MPD uses a mathematical model of the well to estimate the downhole pressure in real time--a nonlinear control algorithm adjusts a choke on the mud return flow to provide bottom hole pressure, compensating for drill pipe motion and rotation and varying mud rates.

Siem WIS’ PCD is based on multiple stationary passive seals towards a dynamic drill pipe. The total pressure in the well is distributed evenly across multiple seals, lowering the load on each seal and at the same time achieving redundancy. The pressure and temperature in each seal are monitored continuously. A control system injects lubricant to every seal to lower friction and improve sealing lifetime. According to Siem WIS, its PCD will act as a primary well barrier element during closed loop drilling operations.

12/10/2009

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