DIRECTIONAL CASING while Drilling (DCWD) using a rotary steer-able system (RSS) or a steerable positive displacement motor (PDM) is a recent enabling technological application of casing while drilling. It has been applied in wells in the North Sea and the Middle East using both RSS and PDMs. The technology was recently used in a project from a producing platform in the Asia Pacific region. The project was completed successfully in terms of increasing ROP and lowering the time and cost to drill the top-hole section of the well. Top-hole directional drilling of wells in high-density locations, such as multi-well producing platforms, require carefully planned procedures and reliable techniques. The procedure requires, in addition to directional capabilities, that the well meet the demands of anti-collision concerns within the torque and hydraulic operating parameters of the formation.
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