A subsea electrical connector or electrical cable having a conductor, an insulator coaxial with the conductor; and at least one of a volumetric compensating diaphragm located radially outwardly of the insulator, or a termination boot. The diaphragm or termination boot has a compound layer, the compound layer includes a graphene nano-platelet additive incorporated into a cross-linked polymer matrix to produce a polymer composite.

A pressure compensated sensing system and methods for using the same are provided. The system can include a housing, a seal, an incompressible fluid, and sensing elements. The seal can be positioned within a housing cavity and divide the cavity into two portions. A first cavity portion can be sealed from the fluid environment by the seal and contain the sensing elements and the incompressible fluid. A second cavity portion can be in fluid communication with the fluid environment. The fluid environment can apply an external pressure to the seal that is opposed by an internal pressure of the sealed cavity applied to the seal by the incompressible fluid. When the internal pressure and the external pressure are different, the seal can move in a manner that changes the volume of the sealed cavity by an amount sufficient to equalize the internal pressure with the external pressure.

Downhole connection assemblies include a connector to receive a conductor and pin at opposite ends. The connector includes a first electrical collet, a separate second electrical collet and a sleeve. The first collet includes a first recess in a first end to receive the conductor and a second recess in a second end to receive the pin. The second collet is positioned around the pin and separated from the first collet. The sleeve is positioned around the pin, first collet and the second collet. Downhole cables include a center electrical conductor, a first insulator positioned around the center conductor, a second insulator positioned around the first insulator, and a pressure tube surrounding the second insulator. The cable further includes one or more slots extending axially along a length of the second insulator, or one or more slots extending axially along an inner diameter of the pressure tube.

Downhole connection assemblies include a connector to receive a conductor and pin at opposite ends. The connector includes a first electrical collet, a separate second electrical collet and a sleeve. The first collet includes a first recess in a first end to receive the conductor and a second recess in a second end to receive the pin. The second collet is positioned around the pin and separated from the first collet. The sleeve is positioned around the pin, first collet and the second collet. Downhole cables include a center electrical conductor, a first insulator positioned around the center conductor, a second insulator positioned around the first insulator, and a pressure tube surrounding the second insulator. The cable further includes one or more slots extending axially along a length of the second insulator, or one or more slots extending axially along an inner diameter of the pressure tube.

A wellhead valve assembly feedthrough for a cable or conduit comprises a lower connector disposed within the wellhead valve assembly and being coupled to an upper end of a cable or conduit disposed in a wellbore, and a moveable upper connector disposed above the lower connector, the upper connector extensible to connect to the lower connector and retractable to disconnect from the lower connector. The wellhead valve assembly feedthrough further includes a sealed exit arrangement having a segment of conduit or cable passing therethrough to outside the wellhead valve assembly, wherein one end of the segment of conduit of cable is connected to the upper connector.

Downhole wet connection systems, and methods and apparatuses to provide an electrical connection between two downhole strings. In one embodiment, a wet connection system having a first electrode coupled to a load and deployed in a wellbore. The wet connection system also includes a second electrode deployed along a string deployed in the wellbore and proximate to the first electrode. Further, the first electrode and the second electrode form a wet connection to transmit alternating current from the second electrode to the first electrode.

A method for performing a well intervention operation includes the steps of: (a) sealingly coupling a lubricator onto an open top end of a well tree, the lubricator having a hollow interior in which a rotatable winch is contained, the winch having a cable wound thereabout; (b) attaching a tool to the cable; (c) lowering the tool within a well bore to which the well tree is attached; and (d) operating the winch from a location exterior to the lubricator to cause rotation of the winch and winding of the cable, whereby the tool is retrieved from the wellbore.

A blowout preventer (BOP) stack module includes a chassis core including a module frame, a remotely operated underwater vehicle (ROV) coupling hardware coupled to the chassis core, wherein the ROV coupling hardware couples with an ROV configured to transport and selectively couple and uncouple the BOP stack module relative to a BOP stack, a mechanical connector coupled to the chassis core, wherein the mechanical connector couples to a stack frame of the BOP stack, an electrical BOP component coupled to the chassis core, wherein the electrical BOP component performs one or more electrical BOP functions of the BOP stack, and an electrical connector coupled to the chassis core and the electrical BOP component, wherein the electrical couples to a corresponding electrical connector of the BOP stack or an adjacent BOP stack module.

A hanger system for a well includes a pipe spool and a tubing hanger removably coupled to the pipe spool. The pipe spool includes a spool housing defining a cylindrical spool bore extending longitudinally through the spool housing, an electrical port in the spool housing with an electrical port opening in an inner surface of the spool housing, a communication port in the spool housing with a communication port opening in the inner surface of the spool housing, and a control port in the spool housing having a control port opening in the inner surface of the spool housing. The communication port connects to a communication module, the control port connects to a control fluid supply, and the electrical port connects to a power supply. The tubing hanger includes a hanger housing, and an electrical conduit, communication conduit, and control conduit extending through the hanger housing.

A method for performing a well intervention operation includes the steps of: (a) sealingly coupling a lubricator onto an open top end of a well tree, the lubricator having a hollow interior in which a rotatable winch is contained, the winch having a cable wound thereabout; (b) attaching a tool to the cable; (c) lowering the tool within a well bore to which the well tree is attached; and (d) operating the winch from a location exterior to the lubricator to cause rotation of the winch and winding of the cable, whereby the tool is retrieved from the wellbore.