Drilling technologies continue to be driven by — and developed in spite of — the fluctuations in the price of crude oil. In an effort to further optimize the drilling process, especially for deep-water exploration, a system has been developed that allows casing to be run during drilling of a well.

The Casing/Drilling System ("CDS") will save rig time by altering the traditional drilling process. This system has been designed primarily for multi-well offshore platforms, multiwell operations on land, deep-water operations, and for situations requiring operators to drill through and place casing across problem formations quickly. This technology uses a combination of traditional components — bits, mud motors, MWD/LWD tools — as well as some newly developed components that allow drilling of most hole sizes from any drilling unit, with the ability to recover the drilling assembly using wireline or drill pipe.

This paper will describe the physical components and operational aspects of the casing drilling system. Actual well data will demonstrate the value of the system and the lessons learned during initial field use.

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