Coiled-tubing drilling technologies target niche markets

Coiled-tubing drilling (CTD) has been successfully used by ARCO, BP Amoco PLC, and Petroleum Development Oman (PDO) to access hard-to-reach, overlooked, and depleted reservoirs from existing wellbores.Much of this work involves sidetrack, slim-hole, underbalanced, and through-tubing applications that provide distinct economic and operational advantages over conventional methods. Yet the industry remains reluctant to use CTD technologies: Only 1,500 CTD wells have been drilled worldwide, excluding sidetracks and extensions.This first part of an OGJ special on coiled tubing (CT) provides information on current applications and prior developments, shedding light on the various rig types, mar...

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