Systems and methods for producing controlled vibrations within a borehole. In one example, the system includes a movement mechanism and a controller. The movement mechanism is configured to enable translational movement of a first surface relative to a second surface to allow the first surface to impact the second surface to produce a plurality of beats. The frequency and amplitude of the beats may be selectively controlled by suppressing or dampening the beats. The controller is configured to selectively control an amplitude or frequency of the beats to encode information therein, where the amplitude of a beat may be selectively controlled by dampening or suppressing the impact of the first surface and the second surface.

Systems and methods for producing controlled vibrations within a borehole. In one example, the system includes a movement mechanism and a controller. The movement mechanism is configured to enable translational movement of a first surface relative to a second surface to allow the first surface to impact the second surface to produce a plurality of beats. The frequency and amplitude of the beats may be selectively controlled by suppressing or dampening the beats. The controller is configured to selectively control an amplitude or frequency of the beats to encode information therein, where the amplitude of a beat may be selectively controlled by dampening or suppressing the impact of the first surface and the second surface.

Methods and system for controlling downhole pulse power operation are disclosed. A method may include detecting a pulse signal discharged between pulse power drilling (PPD) electrodes and determining an arc characteristic of the pulse signal. The method may further include adjusting pulse power applied to the PPD electrodes based, at least in part, on the determined arc characteristic of the pulse signal.

Methods and system for controlling downhole pulse power operation are disclosed. A method may include detecting a pulse signal discharged between pulse power drilling (PPD) electrodes and determining an arc characteristic of the pulse signal. The method may further include adjusting pulse power applied to the PPD electrodes based, at least in part, on the determined arc characteristic of the pulse signal.

Disclosed is a vibratory apparatus for a drilling apparatus comprising: a housing, a rotor operable to rotate relative to the housing, the rotor comprising one or more sets of magnets, a shuttle engaged to enable movement longitudinally, the shuttle comprising one or more follower magnets, each arranged relative to a corresponding set of magnets in the rotor, wherein each set of magnets comprises magnets arranged around the rotor with a lateral spread such that on rotation the corresponding follower magnet on the shuttle will move longitudinally to follow one or more rotating magnets of the set, thus oscillating the shuttle longitudinally.

Disclosed is a vibratory apparatus for a drilling apparatus comprising: a housing, a rotor operable to rotate relative to the housing, the rotor comprising one or more sets of magnets, a shuttle engaged to enable movement longitudinally, the shuttle comprising one or more follower magnets, each arranged relative to a corresponding set of magnets in the rotor, wherein each set of magnets comprises magnets arranged around the rotor with a lateral spread such that on rotation the corresponding follower magnet on the shuttle will move longitudinally to follow one or more rotating magnets of the set, thus oscillating the shuttle longitudinally.

A pressure pulse system includes a stator, a rotor rotatably positioned in the stator, and a valve assembly configured to induce a pressure pulse in response to rotation of the rotor within the stator, wherein the valve assembly includes a first valve plate coupled to one of the stator and the rotor and including a flow passage, and a second valve plate coupled to the other of the stator or the rotor to which the first valve plate is not coupled and comprising a first flow passage and a second flow passage that is spaced from the first flow passage, wherein the valve assembly provides a first flowpath and a second flowpath between the flow passage of the first valve plate and the second flow passage of the second valve plate.

A sonic-powered method is provided for horizontal directional drilling. The method includes positioning a drilling apparatus at one end of a desired path for a generally horizontal bore to be formed, and attaching a drill bit and a drill rod to a drill head. The method also includes advancing the drill bit and the drill rod into and through the ground along the desired path by advancing the drill head to move along the drill mast. A sonic oscillator of the apparatus applies sonic energy in the form of high frequency vibrations to the drill rod and the drill bit to cause the drill bit to penetrate through an underground formation in front of the drill bit along the desired path. The sonic vibrations help efficiently penetrate through different materials in underground formations. The drilling apparatus can also use sonic vibrations to install drill casings to stabilize the bore.

A sonic-powered method is provided for horizontal directional drilling. The method includes positioning a drilling apparatus at one end of a desired path for a generally horizontal bore to be formed, and attaching a drill bit and a drill rod to a drill head. The method also includes advancing the drill bit and the drill rod into and through the ground along the desired path by advancing the drill head to move along the drill mast. A sonic oscillator of the apparatus applies sonic energy in the form of high frequency vibrations to the drill rod and the drill bit to cause the drill bit to penetrate through an underground formation in front of the drill bit along the desired path. The sonic vibrations help efficiently penetrate through different materials in underground formations. The drilling apparatus can also use sonic vibrations to install drill casings to stabilize the bore.

An agitator for vibrating a drill string includes an agitator housing, a rotor and an agitation mass. The drill string has a central axis. The rotor is coupled to the agitator housing and being rotatable about an agitator axis. The agitation mass is coupled to the rotor and is rotatable about the agitator axis. During rotation, a center of mass of the agitation mass is spaced apart from the agitator axis to cause deflection of the agitator axis relative to the central axis to produce vibration in the drill string.