Apparatus, systems, and methods may operate to transmit a data signal along a transmission line extending lengthwise along a drill string, the transmission line comprising an outer conductive path provided by a tubular wall of a drill pipe that extends along the drill string; and an internal conductive path extending along an interior passage that is bounded by a radially inner cylindrical surface of the drill pipe and along which drilling fluid is conveyed, the inner conductive path being substantially insulated from the outer conductive path. Additional apparatus, systems, and methods are described.

Embodiments of the disclosure generally concern equipment for use in operations at oil and gas wells, particularly a structure to transport and locate large diameter electrical cables, such as those used to connect turbine generators to electric pumping units on an oil and gas well site. More specifically the embodiments of the disclosure concern methods and apparatus for transporting, positioning, and manipulating large diameter power cables at the well site of oil and gas wells with a cable transport structure using longitudinal cable retaining members to create channels to store the cables and an end rack to fold extra length of the cable back onto the cable transport structure.

Embodiments of the present disclosure include a system for transmitting electrical energy to a downhole tool including a tubing head. The system also includes a tubing hanger coupled to the tubing head, the tubing head receiving a downward force transmitted by at least a section of tubing coupled to the tubing hanger onto a load shoulder formed in the tubing head. The system includes one or more insulating features for electrically isolating the tubing hanger from the tubing head.

A drill-pipe communication assembly includes a first drill pipe segment. A conductor extends at least partially along a length of the first drill pipe segment. An antenna is electrically coupled to the first drill pipe segment. The antenna facilitates wireless transmission of signals from the first drill pipe segment to an adjacent second drill pipe segment.

A housing defines a through passage along its length and is configured to support a group of electrical isolators surrounding the through passage to form an electrically isolating break in a drill string such that each isolator of the group of isolators is subject to no more than a compressive force responsive to extension and retraction of the drill string. The housing defines a housing cavity to receive an electronics package having a signal port and is configured for electrical connection of the signal port across the electrically isolating break. A housing lid can cooperate with a main housing body to define elongated slots for purposes of enhancing the emanation of a locating signal. A housing arrangement can support electrical connections from an electronics package to bridge an electrically isolating gap.

A downhole power supply and method for supplying downhole power are disclosed. In some embodiments a downhole power supply includes a source power supply including a supply cable coupled to an electric energy source. The downhole power supply further includes at least one downhole distribution network to which the supply cable is configured to couple the electric energy source. The at least one downhole distribution network includes, multiple load supplies providing regulated power levels to multiple downhole loads and a network controller configured to individually connect and disconnect each of the load supplies in response to a failure within the downhole distribution network.

A logging system and method for operating a logging system are typically used in a wellbore. The logging system may include a logging instrument including a rechargeable energy storage and logging electronics, and a cable configured to trickle charge the rechargeable energy storage. The rechargeable energy storage may include an ultracapacitor. The rechargeable energy storage may be trickle charged through the cable from a remote power source.

A unitary junction for deployment in a wellbore, wherein the unitary junction permits electrical power and communications signals to be established in both a lateral wellbore and a main wellbore utilizing. The unitary junction assembly generally includes a conduit having a first upper aperture, a first lower aperture and a second lower aperture where the first lower aperture is defined at the distal end of a primary leg extending from a conduit junction and the second lower aperture is defined at the distal end of a deformable lateral leg extending from the conduit junction. A lower wireless energy transfer mechanism is positioned along at least one of the legs between the distal end of the leg and the junction. The lower wireless energy transfer mechanism is in wired communication an upper energy transfer mechanism permitting electrical communication to be established across the intersection of wellbore branches utilizing the unitary junction.

An inductive transmission element comprising a magnetically conductive electrically insulating, MCEI, annular core. The core comprises an outer wall and an inner wall apart from the outer wall. The respective walls are joined by a planar top surface. The inner wall and the outer wall form an annular trough opening adjacent the top surface. The open annular trough comprises opposed diagonal walls that intersect the top surface and a circular region at the distal end of the opposed diagonal walls. The annular trough opening may be wider or narrower than the planar top surface between the diagonal walls and outer surface. The annular core may be disposed within an annular housing comprising a polymeric block. The diagonal walls may intersect the top surface at an angle greater than 93°. The diagonal walls may intersect the circular region at an angle greater than 93°. The top surface may be polished.

An electric submersible pump (ESP) power cable. The ESP power cable has a first plurality of electric conductors encased in a first protective armor wherein a first void area is defined between the first plurality of electric conductors and the first protective armor, has a second plurality of electric conductors encased in a second protective armor wherein a second void area is defined between the second plurality of electric conductors and the second protective armor and wherein each one of the second plurality of electric conductors is spliced to a corresponding one of the first plurality of electric conductors, has a first filler positioned at least partially in the first void area, and comprises a second filler positioned at least partially in the second void area.