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Directional casing drilling

Image Number 8 for United States Patent #7086485.

A directional drilling system, including a casing string, a casing latch disposed inside the casing string proximate a lower end of the casing string and coupled to the casing string, a rotary steerable system disposed inside the casing string and coupled to the casing latch, and a drill bit coupled to the rotary steerable system.

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