A system can include a first wireless coupler and a second wireless coupler. The first wireless coupler can include a first laminated core that can be wrapped around a tubular and a first wire wrapped around the first laminated core. The second wireless coupler can include a second wire that can be positioned coaxially around the first wire and at a distance from the first wire for facilitating wireless power transfer between the first wireless coupler and the second wireless coupler. The second wireless coupler may or may not include a second laminated core wrapped around the second wire.

A well system may include a tubing string positioned downhole in a wellbore defining an annulus between the tubing string and a wellbore. An annular safety valve may be positioned at the surface of the wellbore for controlling a passage of gas through the annular safety valve into the annulus. The annular safety valve may include an inductive coupler that is coupled to a power source at the surface via a power line for powering the annular safety valve.

A bipartite transmission coupler assembly comprising a downhole tool such as a drill pipe having an axial bore comprising a bore wall. The bore wall comprising a first annular groove open to the bore. The coupler may comprise a cylinder comprising an outside wall and an inside wall separated by top and bottom walls. The top wall comprising an annular recess configured to house a transmission assembly. The outside wall comprising a second annular groove configured to align with the first annular groove when the cylinder is installed into the axial bore. An annular spring ring may be housed within the second annular groove such that when the grooves are aligned within the axial bore, the spring ring radially expands at least partially into the first annular groove, securing the elongate cylinder within the axial bore. The cylinder may be divided into a first part and a second part.

A system is provided for providing power and/or communication to/from a downhole device by inductively coupling a coupling conductor within a receiver to a core conductor of a tubing encased conductor (TEC). The receiver has an elongated housing arranged physically proximate or touching an outer surface of the TEC. A coupling conductor is disposed within the housing, extends substantially parallel to a longitudinal axis of the housing, and further extends longitudinally and in close proximity to a core conductor housed within the TEC when the housing is arranged physically proximate or touching the outer surface of the TEC. This exposes the coupling conductor to a magnetic field formed externally to the TEC to excite a current in the coupling conductor. In one or more embodiments, the receiver further includes a coupling to electrically couple the downhole device to the coupling conductor and deliver the current to the downhole device.

A resilient electrical conductor for an inductive coupler assembly comprising a loop comprising first and second ends. The first and second ends being harder than the loop. The loop is located within an annular recess in the top wall of a cylindrical housing. A magnetically conductive electrically insulating, MCEI, channel surrounding the loop provides a transmission element for the electromagnetic field produced by the loop when energized. The first end is configured for connection to a transmission line and the second end is configured for attachment to ground. The wire loop comprises one or more helical segments between the first end and the second end, each segment comprising a plurality of turns. The annular recess may comprise a step in the side wall of the cylinder joining the side wall with the top wall. The segments may comprise vertical coils attached in series or in parallel to the loop.

A downhole control arrangement for installation in hydrocarbon well and for controlling the operation of a downhole valve arrangement comprises an electrically controlled control valve, wherein the control arrangement comprises a control system and an electric power supply source configured for supplying electric power to the control system. A downhole valve arrangement for controlling the flow of an injection fluid into a production tubing of a hydrocarbon well comprises a control arrangement, and a side pocket mandrel for installation in a production tubing for use in a hydrocarbon well, wherein the side pocket mandrel comprises an interior pocket space and a valve arrangement.

A drill pipe joint includes an annular groove formed within its loadable primary or secondary shoulders. The groove may be formed in both shoulders. The groove may have parallel or non-parallel side walls and an undulating bottom wall. One or more of the respective walls may be deformed by peening that may increase the surface hardness of the respective walls. The hardened region may extend a distance from the deformed wall surfaces. An annular wired channel may be disposed within the groove. The channel may comprise a magnetically conductive electrically insulating material enclosing a wire coil on three sides and partially enclosing a top side of the channel. One end of the wire coil may be attached to a backstop that may be grounded to the walls of the groove. The other end of the wire coil may pass through an opening in the channel exiting the shoulder.

A downhole data transmission system comprising a composite polymeric annular block including a ferrite channel molded therein. The block being suitable for being housed within an annular groove or trough in the shoulder of a drill pipe. The annular block comprising a volume of sub-micron and micron elements of Fe and Mn. The ferrite channel defining an annular core region and an insulated helical coil laying within the core region. One end of the insulated helical coil passing through the ferrite channel and the annular block. A gasket molded into the block and extending from the block provides a sealed pathway for the end of the coil to exit the groove and connect to a cable; the other end of the coil being connected to ground. The annular block further includes a bumper protruding from its peripheral wall and a void opening within the annular block proximate the bumper.

A nuclear magnetic resonance (NMR) downhole tool and method that may include a housing, a power source, a Radio Frequency (RF) pulse generator tank electrically connected to the power source, a power switch electrically disposed within the RF pulse generator tank and disposed in the housing, and an NMR signal acquisition tank electrically connected to the RF pulse generator tank and disposed in the housing. The method may include disposing the NMR downhole tool into a wellbore, charging a first capacitor with the power source that is electrically connected to the first capacitor, generating a RF pulse, disconnecting the first capacitor from the RF pulse generator tank, and storing energy from the inductive coil in the first capacitor. The method may further include connecting the inductive coil to an NMR signal acquisition tank using a decoupler switch and acquiring an NMR signal with the NMR signal acquisition tank.

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.