Wellhead system and method of operating a wellhead system

A wellhead system comprising:

• a wellhead assembly which is generally tubular and which is configured to be secured to a top of a borehole, the wellhead assembly comprising a main passage having a longitudinal axis, and an interior surface which encloses the main passage;
• and
• a landing assembly comprising a tubing hanger, a longitudinal axis, and an orientation control assembly;
• wherein the landing assembly is configured to be lowered into the main passage of the wellhead assembly to land the tubing hanger in the wellhead assembly;
• wherein the orientation control assembly comprises:
• an orientation engagement assembly comprising a segmented sleeve having a plurality of locking segments arranged circumferentially around the longitudinal axis;
• an actuator system which is configured to move the orientation engagement assembly between a retracted configuration and an engaged configuration in which the segmented sleeve engages with the interior surface of the wellhead assembly, wherein the segmented sleeve is driven from the retracted configuration to the engaged configuration via an angled interface between the segmented sleeve and an energizing member, wherein the energizing member is configured to move in a first direction to energize the segmented sleeve along the angled interface and cause at least the plurality of locking segments of the segmented sleeve to expand in a second direction crosswise to the first direction;
• a motor;
• and
• a drive part which is configured to engage with the orientation engagement assembly and, when the orientation engagement assembly is in the engaged configuration, to be driven by the motor and to rotate the tubing hanger relative to the wellhead assembly about the longitudinal axis of the landing assembly.