Abstract: A downhole assembly for directionally drilling a borehole has a motor, a transmission, and a steering mechanism. The motor has a rotor driven in a stator by flow of drilling fluid therebetween. The transmission operatively couples the rotor to a drill bit for drilling the borehole. A flow control controls the flow of drilling fluid through an internal passage of the rotor. The flow control can thereby vary the drive of the rotor in a bit speed effect that preferentially cuts the wall of the borehole to achieve directional drilling. The flow control can also thereby create a differential pressure displacing the rotor along a longitudinal axis of the motor in a thrust effect. The steering mechanism responds to the displacement of the rotor and deviates a direction of the drill bit from the longitudinal axis of the motor to further achieve directional drilling. The bit speed effect, the rotor displacement, and the deviation are preferentially coordinated to coincide or at least operate together.

Abstract: A bottom hole assembly for a drill string has a mud motor and a mandrel. The motor has a rotor and a stator, and the rotor defines a bore for passage of conductors. The mandrel has a bore for passage of the conductors and for drilling fluid, and rotation of the mandrel rotates a drill bit. A shaft and universal joints covert orbital motion at the rotor to rotational motion at the mandrel. To pass the conductors from a sonde uphole of the motor to electronics disposed with the mandrel, an inner beam disposes in a bore of the shaft. This inner beam has an internal passage for the conductors, and seal caps dispose on each end of the inner beam to seal inside the universal joints. The inner beam and seal caps prevent drilling fluid passing from the motor and around the shaft from communicating in the shaft's bore.

Abstract: A bottom hole assembly for a drill string has a mud motor and a mandrel. The motor has a rotor and a stator, and the rotor defines a bore for passage of conductors. The mandrel has a bore for passage of the conductors and for drilling fluid, and rotation of the mandrel rotates a drill bit. A shaft and universal joints covert orbital motion at the rotor to rotational motion at the mandrel. To pass the conductors from a sonde uphole of the motor to electronics disposed with the mandrel, an inner beam disposes in a bore of the shaft. This inner beam has an internal passage for the conductors, and seal caps dispose on each end of the inner beam to seal inside the universal joints. The inner beam and seal caps prevent drilling fluid passing from the motor and around the shaft from communicating in the shaft's bore.