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The modern Ultra Extended Reach Drilling projects become more and more challenging. Some of the lately drilled ERD’s<br>probably reached or came close to the edge of available drilling technology. The most breathtaking well was Maersk BD-04A<br>completed by May 2008 offshore Qatar with 12 290 m (40 320 ft) TMD and 11 569 m (37 956 ft) departure [1]. Other wells with less<br>TMD are as much complicated as BD-04A.