DYNAMIC POSITIONING OF SEMI COST EFFECTIVE FOR SHALLOW WATER EXPLORATION

John P. Edmondson BP Exploration Operating Co. Ltd. Aberdeen The use of a dynamic positioning (DP) system for station keeping a semisubmersible in water depths as shallow as 101 m (330 ft) has allowed substantial cost savings for short duration exploration wells in the North Sea.. BP Exploration Operating Co. Ltd.'s semisubmersible drilling unit Ocean Alliance is capable of drilling exploration wells in anchored mode in water depths to about 550 m (1,800 ft) and in dynamic positioning mode

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