Disclosed is a rotary steering drilling apparatus. The rotary steering drilling apparatus includes a plurality of cylinders that are fixedly connected in series, wherein at least a part of adjacent cylinders are in power connection via a power connection unit; the power connection unit includes a first electrical connecting assembly and a second electrical connecting assembly, the cylinder in power connection is provided with a first electrical connecting assembly at one end and a second electrical connecting assembly at the other end, the adjacent cylinders are in power connection via the first electrical connecting assembly and the second electrical connecting assembly, and the first electrical connecting assembly and the second electrical connecting assembly on the same cylinder are in power connection; the first electrical connecting assembly includes a first electrical connecting ring which is arranged annularly, and the first electrical connecting ring includes a plurality of first conducting regions and first insulating regions which are distributed circumferentially and are spaced apart; and the second electrical connecting assembly includes a second electrical connecting ring which is arranged annularly, and the second electrical connecting ring includes a plurality of second conducting regions and second insulating regions which are spaced apart. The rotary steering drilling apparatus according to the present application can achieve multi-path power connection between adjacent cylinders and has the advantages of being convenient to mount, high in conductivity reliability and the like.

A sensor apparatus for wellbore applications includes an electrical conductor extending within an armored tubular jacket to protect the electrical conductor. The electrical conductor is isolated from wellbore fluids when the sensor is placed in a wellhead flange by redundant seals such that the tubular jacket around the conductor does not provide a leak path to the surrounding subsea or surface environment. To isolate the electrical conductor, a connector housing may be provided that establishes a glass-metal seal or a PEEK-metal seal with the electrical conductor. The connector housing may be welded or otherwise sealed to a Christmas tree flange that connects to the wellhead flange. The welds and seals of the sensor apparatus may be proof tested to ensure their effectiveness before the Christmas tree flange is installed in the subsea or surface environment.

A pipe segment having an insulated electrical conductor includes a first electrical contact disposed at one end of an electrical conductor on an interior of the pipe segment from a male threaded connection on one end to a female threaded connection on the other end of the pipe segment. A second electrical contact is on the other end of the insulated electrical conductor. The first contact makes electrical connection with the second contact in an adjacent segment when the male connection on one segment is engaged to the female connection on the adjacent segment. A seal disposed on an interior of an insulating layer on an interior wall of each respective pipe segment provides a space beyond the end of the seal to enable inward flexure of the seal under pressure such that lubricant extruded by connecting the male threaded end and the female threaded end is pressure relieved.

A gap sub assembly for electromagnetic telemetry used in downhole drilling is disclosed. 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 disconnect tool can be part of a production string in a wellbore. The disconnect tool can include a disconnect sub and a disconnect receptacle. The disconnect sub can be inserted into the disconnect receptacle such that the disconnect sub is concentric with the disconnect receptacle. The disconnect sub and the disconnect receptacle can include bands having multiple electrically conductive sections separated by an electrically insulating material. Insertion of the disconnect sub into the disconnect receptacle cause the electrically conductive sections of the disconnect sub to contact the electrically conductive sections of the disconnect receptacle, thereby completing multiple electrical connections between a control system uphole of the disconnect tool and one or more devices downhole from the disconnect tool along the lower portion of the production string. The disconnect tool allows the upper portion of the production string to be removed leaving devices in the lower production string undisturbed.

A cable splice assembly includes a tubing encapsulated cable, an electric submersible downhole cable, where the tubing encapsulated cable and the electric submersible downhole cable are tape-spliced through a pair of respective contacts, and a thermoplastic insulator to seal the tubing encapsulated cable. A shell contains the tape-spliced tubing encapsulated cable and the electric submersible downhole cable and multiple layers of sealant tape are wrapped around at least the tubing encapsulated cable and the thermoplastic insulator inside the shell, where a number of layers of the sealant tape is selected to create a pressure blocking seal inside the shell.

A wet connector for a downhole tool string includes an insulating material body, a conductive core and an insulating piston. The insulating material body is provided with a first chamber, and the first chamber is filled with insulating oil. A conductive core chamber of the conductive core is communicated with the first chamber. The insulating piston is hermetically connected to a first opening through a first sealing lip. When a male connector abuts against the insulating piston and moves toward the bottom of the conductive core chamber, the male connector is in contact with and electrically connected to the conductive core chamber and causes oil to flow from the conductive core chamber so that the insulating oil in the first chamber is compressed and a pressure of the insulating oil in the first chamber is enabled to be greater than a pressure of well fluid outside the wet connector.

A first completion system with electrical isolation, electronics, and a first side of a coupler is installed in a borehole drilled in a geological formation. A second completion system is installed in the borehole after installation of the first completion system. The second completion system has a second side of the coupler aligned with the first side of the coupler and an umbilical which carries power from a surface of the geological formation to the second side of the coupler. Power is sent from the second side of the coupler to the first side of the coupler, from the first side of the coupler to a first side of the electrical isolation, and from the first side of the electrical isolation to a second side of the electrical isolation via an isolation barrier. The power at the second side of the electrical isolation is provided to the electronics.

A system for transmitting data and power downhole includes an annular groove in a downhole tool such as a drill pipe shoulder or other tool body. A housing for an inductive coupler being disposed within the annular groove. The housing may be a metal ring or a polymeric ring suitable for downhole conditions. An annular MCEI trough may be located within the housing. The MCEI trough may comprise segments. One of the segments may comprise one or more perforations. An electrically conductive coil may be placed in the MCEI trough. The coil may comprise a transmission end and a groundable end. The groundable end may be connected to the tool body by a ground post through the perforations in the MCEI segments and the housing. The transmission end may be connected to a cable within the downhole tool through the other perforation in the MCEI trough and housing.

Disclosed embodiments relate to weight modules for use in a wellbore tool string. In some embodiments, the weight module may comprise a conductive body, extending in an axial direction, and an insulating cover. The conductive body may be configured to fit within a hollow interior of a weight module housing, and the insulating cover may be configured to electrically isolate the conductive body from the weight module housing. In some embodiments, the conductive body may have a first contact portion, provided at a first end of the conductive body, and a second contact portion, provided at a second end of the conductive body, with the first contact portion in electrical communication with the second contact portion through the conductive body.