Historically well drilling operations have been basedexclusively on steel pipe. Recently a drilling system thatcombines composite coiled tubing technology and hydraulicworkover technology has been introduced. This paperexamines the operating experience for the system and itsimplications for the future.By using composite pipe with embedded conductors, thesystem achieved uninterrupted real-time two-waycommunication with the downhole tools. This allowed a stepchangeimprovement in the knowledge of dynamic wellboreconditions and in the control over downhole systems. Newprocedures were developed to assimilate and use thisincreased functionality. These procedures include bothgeosteering and real-time system diagnostics from remotelocations.Incorporating a hydraulic workover (HWO) jackingsystem as an integral part of the drilling unit also expanded theoperating envelope and functionality of the entire drillingsystem. This revolutionary full-system developmentencountered numerous challenges, many of which are relatedto the unique properties of composite pipe in difficult holeconditions. The technological solutions to these challenges areexamined in depth.
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