System and method for umbilical-less positional feedback of a subsea wellhead member disposed in a subsea wellhead assembly

摘要

A positional feedback system includes a seal assembly coupled to a running tool, the seal assembly having a seal ring and an energizing ring positioned between a hanger and a subsea wellhead. The energizing ring moves relative to the seal ring from an unset position to a set position to seal to the wellhead and the hanger. The system includes a magnet disposed on the energizing ring and having a magnetic field. One or more sensing devices are disposed on running tool and positioned in the magnetic field of the magnet in the set position and the unset position. The sensing devices are configured to communicate with a surface platform when the rare earth magnet passes a magnetic field through the sensing devices.

主权项

1. A positional feedback system for sealing a hanger within a subsea wellhead with a hanger setting and sealing system, the feedback system comprising:
a seal assembly releasably coupled to a running tool, the seal assembly configured to be positioned between an outer diameter surface of the hanger and an inner diameter surface of the wellhead, the seal assembly having an upper portion that moves relative to a lower portion when the seal assembly is being moved from an unset to a set position to form a seal between the seal assembly and the inner and outer diameter surfaces of the wellhead and the hanger, respectively; a magnet having a magnetic field, the magnet disposed on the upper portion of the seal assembly; the running tool configured to set the hanger in the wellhead; and one or more sensing devices disposed on the running tool, the one or more sensing devices positioned in the magnetic field of the magnet in one or more of the set position and the unset position, the one or more sensing devices configured to communicate with a surface platform when the magnet moves relative to the one or more sensing devices, thereby sensing a change in the magnetic field due to said relative movement.