Abstract: Downhole telemetry systems and related methods to adaptively adjust pulse waveform width through digitally controlled pulsing parameters.

Abstract: Downhole telemetry systems and related methods adaptively compensate for channel non-linearity effects. To compensate for channel non-linearity, the optimum signal generation parameters are determined that produce the desired modulated pressure variation at the surface. The signal generation parameters are optimized to minimize the discrepancy between the surface detected pressure signal and the intended signal. The mud propagation channel is first estimated in light of the known modulation scheme under an ideal linear-time-invariant channel assumption. The estimated channel is used to synthesize the modulated pressure signal undergoing the mud propagation given the initial signal generation parameters. The method then varies the synthesized signal generation parameters to search for the optimal signal generation parameters. The optimal signal generation parameters are then sent over downlink channel to the downhole pulser, which is ultimately used to generate the pulse waveform.

Abstract: An electronics enclosure system includes a pressure housing with a thermally conductive material and a plurality of shells disposed within the pressure housing, wherein the plurality of shells are coupled together to form an enclosure, and wherein each shell of the plurality of shells comprises thermally conductive material. The electronics enclosure system further includes at least one circuit board secured to an inner surface of a respective shell of the plurality of shells and a plurality of electronic components secured to the at least one circuit board, the plurality of shells, or some combination thereof.

Abstract: An electronics enclosure system includes a pressure housing with a thermally conductive material and a plurality of shells disposed within the pressure housing, wherein the plurality of shells are coupled together to form an enclosure, and wherein each shell of the plurality of shells comprises thermally conductive material. The electronics enclosure system further includes at least one circuit board secured to an inner surface of a respective shell of the plurality of shells and a plurality of electronic components secured to the at least one circuit board, the plurality of shells, or some combination thereof.

Abstract: A downhole telemetry method and system are disclosed. In some embodiment, a method includes driving a pulser device based on an input data stream, wherein driving the pulser device includes generating modulated pressure pulses including modulated pulse shapes within a fluid telemetry medium. In some embodiments in which bi-modulation is utilized, the method further includes driving the pulser device including modulating pressure pulses including pulse position modulating pressure pulses.

Abstract: An apparatus comprising a housing having a housing throughbore extending therethrough along a central axis; a motor drive shaft disposed in the housing throughbore; a component drive shaft disposed in the housing throughbore; and an alignment coupler mechanically coupling the motor drive shaft with the component drive shaft. The alignment coupler comprises: an alignment coupler body having an alignment coupler body throughbore extending therethrough; a spherical bolt comprising a spherical first end and an elongated section extending from the spherical first end to a second end; a thermally expandable material (TEM) section; a spring section comprising one or more springs; and one or more spherical spacers. The alignment coupler enables alignment of the motor drive shaft and the component drive shaft within the apparatus during assembly of the apparatus, and heating of the TEM provides rigidity to the assembled apparatus prior to use.

Abstract: Downhole telemetry systems and related methods adaptively compensate for channel non-linearity effects. To compensate for channel non-linearity, the optimum signal generation parameters are determined that produce the desired modulated pressure variation at the surface. The signal generation parameters are optimized to minimize the discrepancy between the surface detected pressure signal and the intended signal. The mud propagation channel is first estimated in light of the known modulation scheme under an ideal linear-time-invariant channel assumption. The estimated channel is used to synthesize the modulated pressure signal undergoing the mud propagation given the initial signal generation parameters. The method then varies the synthesized signal generation parameters to search for the optimal signal generation parameters. The optimal signal generation parameters are then sent over downlink channel to the downhole pulser, which is ultimately used to generate the pulse waveform.

Abstract: Downhole telemetry systems and related methods to adaptively adjust pulse waveform width through digitally controlled pulsing parameters.

Abstract: A mud pulse telemetry tool includes a dampener for reducing shock and vibration. The mud pulse telemetry tool includes a housing having a shoulder formed along an inner surface thereof, the housing including an orifice formed therein. A piston assembly is longitudinally movable in the housing between a retracted position and an extended position. The piston assembly includes a poppet disposable in the orifice in the extended position and a piston connected to the poppet. The dampener is disposed longitudinally between the piston and the shoulder, the piston being movable in contact with the dampener when the piston assembly is in the extended position.

Abstract: An apparatus comprising a housing having a housing throughbore extending therethrough along a central axis; a motor drive shaft disposed in the housing throughbore; a component drive shaft disposed in the housing throughbore; and an alignment coupler mechanically coupling the motor drive shaft with the component drive shaft. The alignment coupler comprises: an alignment coupler body having an alignment coupler body throughbore extending therethrough; a spherical bolt comprising a spherical first end and an elongated section extending from the spherical first end to a second end; a thermally expandable material (TEM) section; a spring section comprising one or more springs; and one or more spherical spacers. The alignment coupler enables alignment of the motor drive shaft and the component drive shaft within the apparatus during assembly of the apparatus, and heating of the TEM provides rigidity to the assembled apparatus prior to use.

Abstract: A downhole telemetry method and system are disclosed. In some embodiment, a method includes driving a pulser device based on an input data stream, wherein driving the pulser device includes generating modulated pressure pulses including modulated pulse shapes within a fluid telemetry medium. In some embodiments in which bi-modulation is utilized, the method further includes driving the pulser device including modulating pressure pulses including pulse position modulating pressure pulses.

Abstract: A mud pulse telemetry tool includes a dampener for reducing shock and vibration. The mud pulse telemetry tool includes a housing having a shoulder formed along an inner surface thereof, the housing including an orifice formed therein. A piston assembly is longitudinally movable in the housing between a retracted position and an extended position. The piston assembly includes a poppet disposable in the orifice in the extended position and a piston connected to the poppet. The dampener is disposed longitudinally between the piston and the shoulder, the piston being movable in contact with the dampener when the piston assembly is in the extended position.

Abstract: A method and apparatus according to which an output of a power generation system is controlled. In one embodiment, the power generation system includes a turbine and a feedback control system. The turbine includes a rotor to which a first portion of a power fluid is communicated, the first portion imparting torque to the rotor; a shaft to which the rotor is connected; a shroud extending circumferentially about the rotor and the shaft; and a bypass gap between the rotor and the shroud, through which a second portion of the power fluid is communicated. The feedback control system axially displaces the shroud relative to the rotor, thereby adjusting the size of the bypass gap and, consequently, the ratio of the first portion relative to the second portion.

Abstract: A electrical conveyance for downhole tools is disclosed. The electrical conveyance system may include an electrical power manifold, a drill string coupled to the electrical power manifold, a multi-conductor conduit extending through an interior of the drill string, and a stinger assembly extending from an exterior of the electrical power manifold to an interior of the electrical power manifold to couple the multi-conductor conduit to an electrical power source.

Abstract: The present disclosure relates to a magnetic coupling of a downhole tool that includes a first annular array of magnetic sections, a second annular array of magnetic sections coupled to the first annular array by a magnetic field that transfers rotational motion from the first annular array to the second annular array, and a barrier disposed between the first annular array and the second annular array, the barrier including an erosion-resistant layer. The present disclosure also relates to a method of bootstrapping a magnetic coupling of a downhole tool. The method includes supplying electrical current from a battery to an electromagnetic coil in the magnetic coupling, transferring rotational motion from the magnetic coupling to an alternating current (AC) source and supplying electrical current from the AC source to the electromagnetic coil.

Abstract: A method and apparatus according to which an output of a power generation system is controlled. In one embodiment, the power generation system includes a turbine and a feedback control system. The turbine includes a rotor to which a first portion of a power fluid is communicated, the first portion imparting torque to the rotor; a shaft to which the rotor is connected; a shroud extending circumferentially about the rotor and the shaft; and a bypass gap between the rotor and the shroud, through which a second portion of the power fluid is communicated. The feedback control system axially displaces the shroud relative to the rotor, thereby adjusting the size of the bypass gap and, consequently, the ratio of the first portion relative to the second portion.

Abstract: A electrical conveyance for downhole tools is disclosed. The electrical conveyance system may include an electrical power manifold, a drill string coupled to the electrical power manifold, a multi-conductor conduit extending through an interior of the drill string, and a stinger assembly extending from an exterior of the electrical power manifold to an interior of the electrical power manifold to couple the multi-conductor conduit to an electrical power source.