A rotary steerable bottom hole assembly includes a drill bit disposed at a distal end thereof, and azimuthal resistivity antennas and electronics configured to measure a distance to a formation boundary.

A boring tool is movable through the ground. A transmitter supported by the boring tool transmits an electromagnetic homing signal. A portable device monitors the electromagnetic homing signal and receives the electromagnetic homing signal in a homing mode for guiding the boring tool to a target position. A processor generates steering commands for guiding the boring tool based on a bore plan in a steering mode such that at least some positional error is introduced without using the electromagnetic homing signal. Switching from the steering mode to the homing mode is based on monitoring of the electromagnetic homing signal as the boring tool approaches the portable device to then guide the boring tool to the target position location in compensation for the positional error. Intermediate target positions are described as well as guiding the boring tool based on the homing signal so long as the portable device receives the signal.

A downhole system includes a drill string having a drilling fluid flow channel and at least one turbine alternator deployed in the flow channel. The turbine alternator is configured to convert flowing drilling fluid to electrical power. A voltage bus is configured to receive electrical power from the turbine alternator and at least one electrical motor is configured to receive electrical power from the voltage bus. An electronic controller is configured to provide active control of the turbine alternator via processing a desired speed of the electrical motor to generate a desired torque current and feeding the desired torque current forward to the turbine alternator. The turbine alternator is responsive to the desired torque current such that it modifies the electrical power provided to the voltage bus in response to the desired torque.

A method for drilling a well includes applying energy input to a drill string (31) by at least one of rotating the drill string (31) from surface and operating a drilling motor (41) disposed in the drill string (31) to operate a drill bit (2) at a bottom of the drill string (31); an amount of the applied energy not consumed in drilling formations caused by at least one of motion, deformation, and interaction of the drill string (31) is calculated; an amount of the applied energy used to drill formations below the drill bit (2) is calculated; and at least one drilling operating parameter is adjusted based on energy calculation before or during drilling operation.

Provided are systems and methods for thru-tubing completion including a sub-surface completion unit (SCU) system including a SCU wireless transceiver for communicating with a surface control system of a well by way of wireless communication with a down-hole wireless transceiver disposed in a wellbore of the well, one or more SCU anchoring seals having an un-deployed position (enabling the SCU to pass through production tubing disposed in the wellbore of the well) and a deployed position (to seal against a wall of the target zone of the open-hole portion of the wellbore to provide zonal isolation between adjacent regions in the wellbore) and one or more SCU centralizers having an un-deployed position (enabling the SCU to pass through the production tubing disposed in the wellbore of the well) and a deployed position (to position the SCU in the target zone of the open-hole portion of the wellbore).

An earth-boring tool system that includes a drilling assembly for drilling a wellbore and a surface control unit. The surface control unit includes a prediction system that is configured to train a hybrid physics and machine-learning model based on input data, provide, via the hybrid model, a predictive model representing a rate of penetration of an earth-boring tool and wear of the earth-boring tool during a planned drilling operation, provide one or more recommendations of drilling parameters based on the predictive model, utilize the one or more recommendations in a drilling operation, receive real-time data from the drilling operation, retrain the hybrid model based on a combination of the input data and the real-time data, and provide, via the retrained model, an updated predictive model of a rate of penetration of an earth-boring tool and wear of the earth-boring tool during a remainder of the planned drilling operation.

An apparatus includes a tubular, pressure sensors, expandable pads, a hydraulic chamber, and a computer system. The apparatus can be run in a wellbore. The apparatus is configured to detect whether the tubular is stuck within the wellbore. In response to determining that the tubular is stuck within the wellbore, the apparatus can determine a local of sticking of the tubular in the wellbore and can transmit a signal to the hydraulic chamber to pressurize one or more of the expandable pads, thereby causing the one or more expandable pads to expand and exert a force necessary to free the tubular.

A variable build motor downhole tool allows changing the build rate in a directional drilling operation without pulling the drill string from the hole and replacing a fixed build sub in the drill string. A pad can be extended upon command to increase the build rate and retracted upon command to decrease the build rate. The pad is mounted on an insert disposed within an outer housing and extends outwardly through the outer housing by action of one or more pistons. Electronics housed in the variable build motor tool are used to receive commands from uphole and cause the pistons to extend, forcing the pad outward to increase the build rate.

A system can determine properties associated with a plurality of wellbore zones extending radially outward from a wellbore of a drilling operation. The system can determine an operating window for a drilling pressure of the drilling operation based on the properties associated with the plurality of wellbore zones. The system can access real-time data for the plurality of wellbore zones during the drilling operation. The system can determine an adjusted operating window for the drilling pressure based on the real-time data. The system can output a command to adjust, in real time, at least one drilling parameter of the drilling operation based on the adjusted operating window.

Systems and methods of hydraulically fracturing subterranean formations include modifying a completion operation parameter for hydraulic fracturing a target well, the target well extending through a subterranean formation and a fracture extending from the target well as a result of the hydraulic fracturing. The modification to the completion operation is responsive to detection of a response of a monitor well extending through the subterranean formation, where the response of the monitor well resulting from interactions between the monitor well and the fracture extending from the target well.