Drilling with casing cuts top-hole time, sets length record ///
In western Australia’s Carnarvon basin, drilling the 16-in. hole section and running 13⅜-in. casing was a long process. Fluid losses—sometimes total—required use of seawater to drill, and tight hole conditions resulted in back reaming, wiper trips and spotting pills. To reduce time spent fighting these problems and ensure the 13⅜-in. casing reached TD, a casing drill bit was employed to ream the casing to bottom while improving drill-out time. The operations were carried out using a top drive casing running system already installed on the rig.
The drilling-with-casing (DwC) operations effectively mitigated hole problems, yielded a safer and more cost-effective surface hole, and significantly reduced non-productive time (NPT). In reaching a total depth of 3,296 ft, the application also set a global service company and operator record for the longest section drilled with 13⅜-in. casing.
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