Halliburton Energy Services, Inc.

Hugh Douglas

Sudhir Kumar Gupta

Satish Rajagopalan

Joshua Ardianto

A power system a method for enhanced voltage protection. The system may comprise a surface high voltage power supply, a voltage controller connected to the surface high voltage power supply that sends commands to the surface high voltage power supply to control an output voltage of the surface high voltage power supply, one or more power cables attached to the surface high voltage power supply, a downhole tool connected to the one or more power cables at an end opposite of the surface high voltage power supply, and a dynamic clamp circuit connected to the surface high voltage power supply. A method may comprise creating a setpoint with a dynamic clamp circuit based at least in part on the command, activating the dynamic clamp circuit when the output voltage is higher than the setpoint, and absorbing excess energy from the high voltage power supply with the dynamic clamp circuit.

Enhanced over voltage protection of a downhole system

A power generation device is provided. The power generation device can include a magnetic coupler. The magnetic coupler can be associated with a maximum torque output. The maximum torque output of the magnetic coupler can be based on a size of the magnetic coupler. The power generation device can also include an alternator coupled to the magnetic coupling device. The alternator can convert kinetic energy received from the magnetic coupling device into a current. The kinetic energy can be generated by the magnetic coupler using a rotational force transferred across the magnetic coupling device. The power generation device can also include a power converter device coupled to the alternator to shape the current from the alternator such that the maximum torque output is sufficient to cause the power converter to output a threshold current sufficient for operating a well tool powered using the power generation device.

Current-shaping circuit for use with magnetic couplers downhole

An example downhole power generation apparatus may include a turbine and a drive shaft coupled to the turbine. A plurality of alternators may be coupled to the drive shaft and electrically connected in parallel. When the drive shaft rotates, the plurality of alternators may generate phase-offset alternating current (AC) power signals. AC-to-direct current (DC) conversion circuitry may be coupled to the plurality of alternators.

Direct current power source with reduced link capacitance for downhole applications

A system and method to for communicating with a telemetry tool by generating mud pressure waveforms is disclosed according to one or more embodiments. The system includes a rotor having a first bore spaced axially apart from a second bore and a blade disposed therebetween, a stator having a first and second component with a portion of each stator component disposed in a respective one of the first and second rotor bores, and an actuator having a tubular core wrapped with a winding and a plurality of magnets. The rotor blade includes a plurality of cutouts that may be aligned with a plurality of through bores disposed on each stator component when the rotor is in an open position. The core, winding, magnets, and rotor operate like a limited angle torque motor to electromagnetically produce torque by reciprocatingly rotating the rotor within an angle of rotation.

Reciprocating rotary valve actuator system

Systems and methods of down-hole communication facilitate communication across a mud motor. The systems and methods can employ a hysteresis brake that selectively slows a turbine shaft to thereby produce local pressure pules in a drilling fluid in a predetermined pattern. The hysteresis brake can be operated by providing a relatively small control current to produce a relatively large counter torque, which can be transmitted the turbine shaft. The turbine and the hysteresis brake may be provided below a mud motor, and the local pressure pulses may be transmitted to a receiver disposed above the mud motor while the mud motor is operating. The hysteresis brake can be employed when other communication systems fail, and thus can provide a back-up system to permit a drilling operation to be continued.

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Cheltenham, United Kingdom

Hugh Douglas