DP drillships target deepwater operations

08/23/1999
After a 10-year construction hiatus, contractors began delivering a series of next-generation drillships last year, fulfilling a need for technically advanced, deepwater drilling rigs.Each of the 16 new drillships (Table 1), the last to be delivered in December 2000, will use a combination of dynamic-positioning (DP), riser tensioning, and motion-compensating systems to neutralize the effects of wind, waves, and currents.This conclusion of a two-part series (Part 1, OGJ, May 3, 1999, p. 69) focuses on technologies that: Keep the rig from drifting away from the well center Avoid riser buckling Stabilize the drillstring from up-and-down movements.Dynamic positioningOffshore drilling contrac...
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