Abstract
Summary A new concept for automatically drilling vertical boreholes was recently implemented by Elf Enterprise Caledonia - the Vertical Drilling System. The VDS was used to drill the 16" hole section of a North Sea exploration well. This was the first time this technology had been used offshore, drilling from a semi-submersible drilling unit. The VDS was shown to have an application in penetrating a drilling target that required a near vertical wellbore. Technical functioning of the tool and field experience is reported along with performance comparisons to offset wells.
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