A gap sub assembly for electromagnetic telemetry used in downhole drilling. The gap sub comprises a female part comprising a female mating section and a male part comprising a male mating section. The male mating section is matingly received within the female mating section and electrically isolated therefrom. One or more electrically insulating bodies secure the male part axially and torsionally relative to the female part. The electrically insulating bodies also electrically isolate the male part from the female part. The electrically insulating bodies can be installed through apertures in the female part or at least some of the electrically insulating bodies can be installed before the male mating section is inserted into the female mating section. The electrically insulating bodies can be held in place on the male mating section using a retention apparatus such as a ring, a scarf, pods or an adhesive.

A wetmate connector for wirelessly communicating data or power signals between first and second components includes a first connector half which is mountable to the first component and a second connector half which is mountable to the second component. The first connector half includes a first internal cavity and a first wireless communications device which is positioned in the first internal cavity. The first wireless communications device is operable to transmit or receive wireless data and/or power signals, and the first internal cavity is sealed from an external environment at least when the first connector half is mounted to the first component. The second connector half includes a second internal cavity and a second wireless communications device which is positioned in the second internal cavity. The second wireless communications device is operable to transmit or receive wireless data or power signals, and the second internal cavity is sealed from the external environment at least when the second connector half is mounted to the second component.

A multi-phase, inductive coupling first portion is carried by a tubular. The coupling first portion is configured to inductively transmit current with a corresponding multi-phase, inductive coupling second portion. A downhole-type electric stator is carried by the tubular and is configured to receive and electromagnetically interact with an electric rotor-impeller. The coupling first portion is electrically connected to windings of the stator.

An assembly can include a barrel housing having an opened end. The barrel housing can also include a barrel port for mounting a first compression fitting. A racetrack tray can be positioned within the barrel housing. The racetrack tray can receive an optical fiber and an electrical cable of a hybrid cable. A cap can be secured to the opened end of the barrel housing. The cap can include a cap port for receiving a second compression fitting. A primary seal can be positioned in a groove on one of the cap or the barrel housing. The primary seal can create a pressure seal between the cap and the barrel housing.

An apparatus comprises a first number of splines located near a first end of a first joint section and a second number of splines located near a second end of a second joint section. The first number of splines extends in an axial direction of the first joint section and spans a circumferential surface of the first joint section. Each of the first number of splines has a base, a tip, and a pair of flanks that extends from the base to the tip and forms an acute angle. Each of the first number of splines are configured to be received between adjacent pairs of splines in the second number of splines as the first end of the first joint section and the second end of the second joint section are joined.

A downhole communication system includes a gap sub located at an RSS. The gap sub is located on the outer, independently rotating member of the RSS. This allows the RSS to receive electromagnetic downlink communication signals from the surface or from an MWD. The RSS transmits electromagnetic uplink signals to a second gap sub located above the RSS or to the surface.

A system, method and device may be used to provide power and monitor conditions in a borehole. Well tubing and casing act as a conductive pair for delivering power wirelessly to isolated zones defined between packer elements. Data signals are similarly transmitted. The packer elements include magnetic toroidal cores for power and signal transmission via inductively coupling.

A completion system for use in a well includes a first completion section and a second section. The first completion section has a sand control assembly to prevent passage of particulates, a first inductive coupler portion, and a sensor positioned proximate to the sand control assembly that is electrically coupled to the first inductive coupler portion. The second section is deployable after installation of the first completion section. It includes a second inductive coupler portion to communicate with the first inductive coupler portion, to enable communication between the first completion section's sensor and another component coupled to the second section.

A flushing arrangement for flushing a surface of a wet-mateable connector for subsea use is provided. The flushing arrangement has a cartridge adapted to form a chamber around the surface to be flushed prior to flushing. The cartridge has a sealing portion adapted to be sealed against a part of the connector. An inlet port for receiving a fluid from a fluid source and an outlet port for discharging a fluid are provided. Plural flow channels are formed in the cartridge, the plural flow channels comprising flow channels providing a fluid connection between the inlet port and the chamber for enabling a flow of fluid into the chamber and flow channels providing a fluid connection between the chamber and the outlet port for enabling a flow of medium out of the chamber.

The invention relates to a drill head and a device for drilling a bore in the ground, the drill head having a first unit coupleable with an inner drill pipe of a double drill pipe assembly and a second unit coupleable with the outer drill pipe of the double drill pipe assembly. By means of the inner drill pipe the first unit is rotatable about an axis of rotation relative to the second unit which is drivable by means of the outer drill pipe. The drill head has a sliding contact arrangement for establishing an electrical connection between the first unit and the second unit.