A system is provided including a coiled tubing reel apparatus including a reel drum for storing a coiled tubing string spooled on the reel drum and a hydraulic reel drive motor that controls rotation of the reel drum. The system further includes a reel controller that determines an estimated reel back tension for a portion of the coiled tubing string between the reel apparatus and the injector based on a set of parameters related to a coiled tubing operation. The reel controller determines a target reel back tension to be applied to the portion of the coiled tubing string by adjusting the estimated reel back tension based on a historical job dataset. The reel controller then determines and sets a target hydraulic pressure of the reel drive motor to achieve the target reel back tension in the portion of the coiled tubing string.

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 wireline system includes an operations cabin with a plurality of electrical devices, and a winch that includes an electric winch motor operable to drive a drum to manipulate a wireline cable. A first engine and a first electric generator are each arranged within the operations cabin and generate electrical power, a second electric generator driven by a second engine via a power takeoff to generate electrical power, and an umbilical extends from the operations cabin to an external energy source to provide electrical power. A battery pack is arranged within the operations cabin and includes rechargeable batteries communicably coupled to the electric generators and the umbilical, wherein the battery pack solely provides electrical power to the electric winch motor and the electrical devices, and wherein the electric generators and the external energy source provide electrical power to recharge the rechargeable batteries.

The disclosed invention concerns a method for installing and operating a thermal well (110) heat carrier transport system (100). A first flexible tubular part (120) is provided into and along a thermal well (110), a second flexible tubular part (130) is provided into the first flexible tubular part (120) and a third open ended tubular part (140) is provided into the second flexible tubular part (130). During installation and operation an installation liquid and heat carrier, respectively, is provided into the second flexible tubular part at an overpressure sufficient to press the first flexible tubular part (120) radially against the inner all of the thermal well (110) in all radial directions. The invention also concerns a system.

The disclosed invention concerns a method for installing and operating a thermal well (110) heat carrier transport system (100). A first flexible tubular part (120) is provided into and along a thermal well (110), a second flexible tubular part (130) is provided into the first flexible tubular part (120) and a third open ended tubular part (140) is provided into the second flexible tubular part (130). During installation and operation an installation liquid and heat carrier, respectively, is provided into the second flexible tubular part at an overpressure sufficient to press the first flexible tubular part (120) radially against the inner all of the thermal well (110) in all radial directions. The invention also concerns a system.

An apparatus for drilling curved and straight sections of a wellbore is disclosed that in one non-limiting embodiment includes a drilling assembly configured to include a drill bit at an end thereof that can be rotated by a drive in the drilling assembly and by the rotation of the drilling assembly, and wherein the drilling assembly includes: a deflection device that (i) tilts a section of the drilling assembly within a selected plane when the drilling assembly is substantially rotationally stationary to allow drilling of a curved section of the wellbore by rotating the drill bit by the drive; and (ii) straightens the section of the drilling assembly when the drilling assembly is rotated to allow drilling of a straight section of the wellbore.

An apparatus for drilling curved and straight sections of a wellbore is disclosed that in one non-limiting embodiment includes a drilling assembly configured to include a drill bit at an end thereof that can be rotated by a drive in the drilling assembly and by the rotation of the drilling assembly, and wherein the drilling assembly includes: a deflection device that (i) tilts a section of the drilling assembly within a selected plane when the drilling assembly is substantially rotationally stationary to allow drilling of a curved section of the wellbore by rotating the drill bit by the drive; and (ii) straightens the section of the drilling assembly when the drilling assembly is rotated to allow drilling of a straight section of the wellbore.

A power and communications cable may include an electromagnetic waveguide, an inner metallic tubular surrounding the electromagnetic waveguide, an electrically conductive material surrounding the inner metallic tubular, an electrically insulating material surrounding the electrically conductive material, and an outer metallic tubular resistant to corrosion and abrasion surrounding the electrically insulating layer. The example system may include an electrical device locatable in the wellbore and coupleable to the cable and a control unit coupleable to the cable and operable to supply power to and communicate with the electrical device via the power and communications cable.

A power and communications cable may include an electromagnetic waveguide, an inner metallic tubular surrounding the electromagnetic waveguide, an electrically conductive material surrounding the inner metallic tubular, an electrically insulating material surrounding the electrically conductive material, and an outer metallic tubular resistant to corrosion and abrasion surrounding the electrically insulating layer. The example system may include an electrical device locatable in the wellbore and coupleable to the cable and a control unit coupleable to the cable and operable to supply power to and communicate with the electrical device via the power and communications cable.

A method can include extruding polyethylene about a lead (Pb) barrier layer disposed about a conductor to form an assembly; and armoring at least one of the assemblies with metallic armor to form a cable. A power cable can include a conductor; a lead (Pb) barrier layer disposed about the conductor; a cushion layer disposed about the lead (Pb) barrier layer where the cushion layer includes crosslinked polyethylene (XLPE); and metallic armor wrapped about the cushion layer.