A subsea wellhead assembly 1 comprises: a subsea wellhead 2; a template 6 associated with the wellhead; subsea riser system equipment 4 connected to the wellhead and one or more connection members. The subsea riser system equipment 4 is also connected to the template 6 by the one or more connection members so that lateral support is provided to the subsea riser system equipment 4 from the template. A method of installing the subsea wellhead assembly 1 is also provided.

A subsea wellhead assembly 1 comprises: a subsea wellhead 2; a template 6 associated with the wellhead; subsea riser system equipment 4 connected to the wellhead and one or more connection members. The subsea riser system equipment 4 is also connected to the template 6 by the one or more connection members so that lateral support is provided to the subsea riser system equipment 4 from the template. A method of installing the subsea wellhead assembly 1 is also provided.

A sensor system for a dual bottle accumulator utilized with a subsea blowout preventer that monitors piston position with a position sensor in the hydraulic bottle, the gas pressure in the associated gas bottle with one or more pressure sensors, and sensors and remote actuators for associated valves.

An initiator monitoring and actuating system includes a first power supply selectively electrically connectable to a charge initiator. The first power supply provides a current lower than an activation current of the initiator. A second power supply is selectively electrically connectable to the charge initiator. The second power supply provides a current of at least the activation current. Switches are selectively operable to connect the second power supply to a test circuit operable to measure a current generated by the second power supply. The switches are selectively operable to connect the second power supply to the charge initiator. A current sensor is operable to measure current through the test circuit and operable to measure current from the first power supply when the first power supply is connected to the charge initiator.

An initiator monitoring and actuating system includes a first power supply selectively electrically connectable to a charge initiator. The first power supply provides a current lower than an activation current of the initiator. A second power supply is selectively electrically connectable to the charge initiator. The second power supply provides a current of at least the activation current. Switches are selectively operable to connect the second power supply to a test circuit operable to measure a current generated by the second power supply. The switches are selectively operable to connect the second power supply to the charge initiator. A current sensor is operable to measure current through the test circuit and operable to measure current from the first power supply when the first power supply is connected to the charge initiator.

A wellhead is provided. The wellhead comprises a high pressure wellhead housing; a casing hanger assembly located within the high pressure wellhead housing; and a casing supported on the casing hanger assembly. The casing hanger assembly is arranged so that the casing is able to move relative to the high pressure wellhead housing. This may be to accommodate well growth experienced by the wellhead during use.

In a subsea blowout preventer stack system having a structural system and one or more accumulators providing a pressurized hydraulic supply wherein the accumulators comprise a compressed gas supply and a hydraulic fluid chamber in one or more vertical bottles, a method of using the one or more vertical bottles of the accumulators as structural members of the structural system.

In a subsea blowout preventer stack system having a structural system and one or more accumulators providing a pressurized hydraulic supply wherein the accumulators comprise a compressed gas supply and a hydraulic fluid chamber in one or more vertical bottles, a method of using the one or more vertical bottles of the accumulators as structural members of the structural system.

A flow control module includes an inlet hub coupled to a first flow passage having a first flow bore, a flow meter associated with the first flow bore and positioned for top-down fluid flow, a choke disposed in a second flow passage having a second flow bore, the second flow passage coupled to a distal end of the first flow passage, and an outlet hub coupled to a distal end of the second flow passage, the outlet hub facing in a different direction from the inlet hub.

A flow control module includes an inlet hub coupled to a first flow passage having a first flow bore, a flow meter associated with the first flow bore and positioned for top-down fluid flow, a choke disposed in a second flow passage having a second flow bore, the second flow passage coupled to a distal end of the first flow passage, and an outlet hub coupled to a distal end of the second flow passage, the outlet hub facing in a different direction from the inlet hub.