Drilling advances ///
World’s first casing drilling from a floater. Weatherford International Ltd. announced that its Drilling & Intervention Services division successfully completed the industry’s first Drilling with Casing (DwC) operation from a Transocean Sedco 601, the semisubmersible rig, in the Madura Strait off East Java Sea, for Santos Madura Offshore PTY LTD. Using Weatherford’s step-change Drilling with Casing technology and a surface BOP, Santos was able to skip the running of its 30-in. casing and downsize the 20-in string to 13-3/8 in. This string was drilled to a depth of 869 ft. The procedure saved 2-1/2 days of rig time – a reduction of over 80% in the overall running time – and enhanced safety, by reducing the number of people on the rig floor during casing running.
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