In one embodiment, a radio-frequency identification device for use in a wellbore includes a housing made of a polymer; and an antenna disposed in the housing. The polymer may be selected from the group consisting of an elastomer, a plastic, a rubber, a thermoplastic elastomer, and combinations thereof. The RFID device may also include a fill material disposed in the housing.

In some aspects, the present disclosure includes systems and methods for rotatably coupling a bottom-hole assembly to a drilling shaft for use in subterranean drilling operations. In one embodiment, the methods of the present disclosure are suitable for underreaming a portion of a wellbore. The methods may comprise rotating a drilling shaft coupled to a drill bit about its axis to form a wellbore; engaging a first locking mechanism rotatably coupled to the drilling shaft with a second locking mechanism coupled to a housing to rotatably couple the drilling shaft and the housing; expanding an expandable reamer attached to the housing; and rotating the housing to widen at least a portion of the wellbore uphole from the drill bit. The bottom-hole may comprise one or more actuators that are selectively operable to engage the first and second locking mechanisms and expand the expandable reamer.

At least one labyrinth seal assembly is disposed within a roller cutter of a roller reamer. A first labyrinth seal assembly of a roller cutter is positioned toward a first pillow block of a cutter cartridge that includes the roller cutter. An optional second labyrinth seal assembly is disposed within the roller cutter and toward second pillow block of the cutter cartridge A bearing shaft of the cutter cartridge extends through an inner channel of the roller cutter. The cutter cartridge is retained in an axial recess of a tool body of the roller reamer via a compound and separate wedging of each of the two pillow blocks into a same axial recess. Each pillow block is rotatably coupled to the bearing shaft at an opposing end of the roller cutter.

At least one labyrinth seal assembly is disposed within a roller cutter of a roller reamer. A first labyrinth seal assembly of a roller cutter is positioned toward a first pillow block of a cutter cartridge that includes the roller cutter. An optional second labyrinth seal assembly is disposed within the roller cutter and toward second pillow block of the cutter cartridge A bearing shaft of the cutter cartridge extends through an inner channel of the roller cutter. The cutter cartridge is retained in an axial recess of a tool body of the roller reamer via a compound and separate wedging of each of the two pillow blocks into a same axial recess. Each pillow block is rotatably coupled to the bearing shaft at an opposing end of the roller cutter.

A rotary downhole tool, for example in the form of a drill bit, is described that includes a tool body, the body defining a gauge region, and at least one gauge roller rotatably mounted to the body.

A rotary downhole tool, for example in the form of a drill bit, is described that includes a tool body, the body defining a gauge region, and at least one gauge roller rotatably mounted to the body.

An integral pressure relief assembly is comprised within a roller assembly of a roller reamer. The integral pressure relief assembly extends through a pair of pillow blocks and a bearing shaft of a retention assembly of the roller assembly. A volume of lubricant is inserted under pressure through a relief valve into an interior channel of the bearing shaft. A spring element in combination with an elastomeric piston provides additional pressure to the pressurized volume of lubricant contained within the integral pressure relief assembly. The lubricant absorbs heat from motion of the bearing shaft and a cutter assembly. As the lubricant increases in pressure, the relief valve releases lubricant from the bearing shaft when a sufficient differential pressure between the contained lubricant and the outside environment is achieved.

An integral pressure relief assembly is comprised within a roller assembly of a roller reamer. The integral pressure relief assembly extends through a pair of pillow blocks and a bearing shaft of a retention assembly of the roller assembly. A volume of lubricant is inserted under pressure through a relief valve into an interior channel of the bearing shaft. A spring element in combination with an elastomeric piston provides additional pressure to the pressurized volume of lubricant contained within the integral pressure relief assembly. The lubricant absorbs heat from motion of the bearing shaft and a cutter assembly. As the lubricant increases in pressure, the relief valve releases lubricant from the bearing shaft when a sufficient differential pressure between the contained lubricant and the outside environment is achieved.

A retractable and extendable roller reamer is positioned on a string. The retractable and extendable roller reamer is configured to support and centralize the string within the wellbore. An extension and retraction mechanism is configured to extend and retract the roller reamer. A hydraulic power unit is configured to control the extension and retraction mechanism. Sensors positioned on or within the roller reamer. The sensors are configured to detect parameters of the well-string stabilizing system. A controller is operatively coupled to the hydraulic power unit and the plurality of sensors. The controller is configured to be positioned in a wellbore. The controller is configured to receive signals from the sensors. The signals represent the parameters detected by the sensors. The controller is configured to identify the parameters represented by the signals. The controller is configured to adjust a well-string stabilizing operation in response to the received signals.

A roller reamer for downhole operations in boreholes, such as are drilled for oil and/or natural gas production, or as injection wells. An elongated main body has preferably three circumferentially spaced pockets. A roller assembly is preferably disposed in each pockets, the roller rotating in roller blocks at each end of the roller disposed within the roller blocks. Mating locking profiles, such as dovetails, lock the roller blocks within the pockets, as the roller blocks are moved longitudinally into the locking profiles, preventing any radially outward movement of the roller assembly. The roller assembly is prevented from longitudinal movement within the pockets by lock blocks also positioned within the pockets.