Steerable system includes shortened bearing-pack motor, extended-gauge PDC

A new steerable drilling system, which integrates a pin-down positive displacement motor (PDM) with a box-up, extended-gauge polycrystalline diamond compact (PDC) bit, has reduced bend angles and downhole vibrations leading to improved directional control and reduced hole spiraling.Although widely recognized for providing excellent "gun-barrel" hole quality in vertical wells, directional engineers and drillers do not commonly combine extended-gauge bits with PDM assemblies, believing each component is incompatible with the other.As a result, efforts have been undertaken to produce a system that retains the attributes of the steerable motor, such as directional control, while providing the...

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