Permit TL/2 in the Carnarvon Basin, Western Australia, presents several challenges for top hole drilling and casing running operations. Previous experience showed that drilling the 16" hole section and running 13-3/8" casing was typically a time consuming phase of the well due to fluid losses and tight hole conditions consequently requiring the use of Seawater to drill, back reaming, wiper trips and occasional spotting of pills.The initial solution delivered to the operator as an alternative method to get 13-3/8" casing to TD was to employ a casing drill bit to ream the casing to bottom whilst also delivering an improved drill-out time. This would be coupled with a sophisticated, unique, reliable and simply-operated top drive casing running system that was already installed on the rig. Pending a review of the service company capabilities, Total Depth Solution systems with cost & time savings analysis, the operator was certain that the application of a complete drilling with casing system (DwC TM ) would mitigate the known hole problems and yield a safe and more cost effective surface hole operation, reducing non-productive time (NPT) significantly.This paper fully reviews the problems that were traditionally encountered during conventional surface hole drilling and casing running operations; the decision making process that the operator followed prior to employing DwC TM technology along with the hazard mitigation & economic benefits realized through a one way trip to Total Depth of +/-1,000 m TVD RT; breaking to date the longest Weatherford 13-3/8" DwC TM interval globally by the service company & operator.
Permit TL/2 in the Carnarvon Basin, WA, presents several challenges for top hole drilling and casing running operations. Previous experience showed that drilling the 16” hole section and running 13⅜” casing was typically a time consuming phase of the well due to fluid losses and tight hole conditions, consequently requiring the use of seawater to drill, back reaming, wiper trips and occasional spotting of pills. The initial solution delivered to the operator as an alternative method to get 13⅜” casing to total depth (TD) was to employ a casing drill bit to ream the casing to bottom while also delivering an improved drill-out time. This would be coupled with a sophisticated, unique, reliable and simply operated top drive casing running system that was already installed on the rig. Reviewing the Weatherford Total Depth Solutions teamâs systems with cost, time and capabilities analysis, the operator was certain that the application of a complete drilling with casing system (DwC™) would mitigate the known hole problems and yield a safe and more cost-effective surface hole operation, significantly reducing non-productive time (NPT). This paper reviews: the problems that were traditionally encountered during conventional surface hole drilling and casing running operations; the decision-making process that the operator followed prior to employing DwC technology; and, the hazard mitigation and economic benefits realised through a one-way trip to total depth of about 1,000 m TVDRT, which broke to date the longest Weatherford 13⅜” DwC interval globally by the service company and operator.
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