A logging tool electronics system is disclosed with noise minimization features and pulse compression signal processing techniques to improve the signal-to-noise ratio of array induction logging tools. The borehole is radiated with a magnetic field produced by a configurable multi-frequency and/or multi-amplitude sine wave signal stimulus section driving a fully differential single transmitter coil. Received signals from multiple mutually balanced fully differential receiver arrays are processed by receiver signal chains using adaptive algorithms under firmware control. The received signals are used to determine the conductivity and resistivity of the formation surrounding the borehole.

A logging tool electronics system is disclosed with noise minimization features and pulse compression signal processing techniques to improve the signal-to-noise ratio of array induction logging tools. The borehole is radiated with a magnetic field produced by a configurable multi-frequency and/or multi-amplitude sine wave signal stimulus section driving a fully differential single transmitter coil. Received signals from multiple mutually balanced fully differential receiver arrays are processed by receiver signal chains using adaptive algorithms under firmware control. The received signals are used to determine the conductivity and resistivity of the formation surrounding the borehole.

A downhole measurement assembly, tool, and method is provided. The downhole measurement assembly includes at least one drill collar 220 having at least one compensation portion and at least one force portion with a load path 239 therethrough. The compensation portion has a different dimension from the force portion. The assembly also includes a plurality of compensation sensors 230.1, 230.2 positionable about the compensation portion to measure downhole tool pressures applied thereto, and a plurality of force sensors 230.3, 230.4 positionable about the force portion to measure downhole forces applied thereto. The compensation sensors and the force sensors are positionable about the drill collar(s) 220 in a strain configuration along the load path 239 whereby the measured downhole tool pressure is isolatable from the measured downhole forces on the drill collar(s).

A downhole measurement assembly, tool, and method is provided. The downhole measurement assembly includes at least one drill collar 220 having at least one compensation portion and at least one force portion with a load path 239 therethrough. The compensation portion has a different dimension from the force portion. The assembly also includes a plurality of compensation sensors 230.1, 230.2 positionable about the compensation portion to measure downhole tool pressures applied thereto, and a plurality of force sensors 230.3, 230.4 positionable about the force portion to measure downhole forces applied thereto. The compensation sensors and the force sensors are positionable about the drill collar(s) 220 in a strain configuration along the load path 239 whereby the measured downhole tool pressure is isolatable from the measured downhole forces on the drill collar(s).

A system includes a utility chassis for use with rock drills for automatic and safe drilling of target surfaces. The utility chassis has a lightweight vertical frame member with an overall center of gravity that allows for manual lift handles to be arrayed about the center of gravity for easy loading and unloading onto transportation vehicles without the need for separate heavy machinery. The utility chassis incorporates a spring-centered closed position valve for drill rotation and a three-way spring-centered retract with two open feed positions valve for increased safety. A hinged drill rod guide cap is incorporated into the drill rod guide for quick removal of the chassis from lodged or broken drill rods. The chassis is lighter, more ergonomic, and safer than prior art chasses.

Methods and apparatus are disclosed for retaining components in a downhole motor in the event of a mechanical separation or failure of one or more components therein. As described, the retention mechanism does not require a threaded connection to components of the mud motor drivetrain. Downhole motor assemblies including the new catch mechanism also include a structural element to engage the catch assembly and the components to which it is attached in the event of a mechanical failure within the mud motor assembly.

Methods and apparatus are disclosed for retaining components in a downhole motor in the event of a mechanical separation or failure of one or more components therein. As described, the retention mechanism does not require a threaded connection to components of the mud motor drivetrain. Downhole motor assemblies including the new catch mechanism also include a structural element to engage the catch assembly and the components to which it is attached in the event of a mechanical failure within the mud motor assembly.

A drilling assembly and method of drilling a wellbore is disclosed. The drilling assembly includes a steering device having a tilt device and an actuation device. A first section and a second section of the drilling assembly are coupled through the tilt device, wherein the first section is attached to a drill bit. The actuation device includes an electromechanical actuator and causes a tilt of the tilt device to cause the first section attached to the drill bit and the drill bit to tilt relative to the second section. The wellbore is drilled using the drill bit. The electromechanical actuator is actuated to tilt the tilt device to cause the first section attached to the drill bit and the drill bit to tilt relative to the second section and to maintain the tilt geostationary while the drilling assembly is rotating to form a deviated section of the wellbore.

A drilling assembly and method of drilling a wellbore is disclosed. The drilling assembly includes a steering device having a tilt device and an actuation device. A first section and a second section of the drilling assembly are coupled through the tilt device, wherein the first section is attached to a drill bit. The actuation device includes an electromechanical actuator and causes a tilt of the tilt device to cause the first section attached to the drill bit and the drill bit to tilt relative to the second section. The wellbore is drilled using the drill bit. The electromechanical actuator is actuated to tilt the tilt device to cause the first section attached to the drill bit and the drill bit to tilt relative to the second section and to maintain the tilt geostationary while the drilling assembly is rotating to form a deviated section of the wellbore.

The invention provides a bit breaker comprising a generally flat plate that defines two arms and a base leg. The two arms project respectively from opposed ends of the base leg. The bit breaker has a generally rectangular pipe slot located between the two arms. The bit breaker includes a jaw mounted on one of the arms so as to be removable therefrom when damaged and thereafter replaced with a new jaw. The jaw defines a working surface located on a side of the pipe slot. In some embodiments, the bit breaker further comprises a security plate attached to the generally flat plate so as to define a mount space between the generally flat plate and the security plate. The jaw is received in the mount space such that the jaw has limited freedom of movement relative to both the generally flat plate and the security plate.