The modern era of drilling using coiled tubing began in the early 1990's and was made possible by the development of enabling technologies such as slim-hoie drilling tools, improvements in tubing metallurgy and horizontal drilling techniques. The industry has recognised that coiled tubing drilling is most applicable for underbalanced drilling, re-entry drilling and through tubing re-entry drilling. Most coiled tubing drilling jobs have been completed using conventional or slightly modified coiled tubing units. A number of hybrid units have been built that incorporate conventional coiled tubing technology with conventional hydraulic jack systems for jointed pipe handling. At the same time as interest in coiled tubing drilling has grown, the interest in slim-hole drilling has waned as the industry recognised that although there was a need for fit for purpose slim-hole drilling units, the capital to build the units was not available. This paper describes a unique rig concept that has been designed specifically for coiled tubing drilling and slim-hoie drilling applications using jointed pipe.

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