Rigless abandonment system

摘要

A rigless abandonment system including a surface vessel having an attached lifting device and a moonpool. The system further includes a cutting module configured to connect to a subsea wellhead, the cutting module having a wellhead connector having an actuatable lock and release mechanism, a motor assembly, and a cutter. An umbilical line connects the cutting module to the surface vessel, wherein the lifting device is used to raise and lower the cutting module connected to the surface vessel through the moonpool. A method for performing rigless casing cutting and wellhead removal operations, the method includes positioning a surface vessel above a subsea wellhead, where the surface vessel has a moonpool and a lifting device. The method further includes providing a cutting module, and deploying the cutting module through the moonpool, wherein the cutting module is connected to the surface vessel by an umbilical line.

主权项

1. A rigless abandonment system comprising:
a drilling supply vessel comprising:
an attached lifting device capable of, with the drilling supply vessel, raising loads weighing up to at least 200,000 pounds; anda moonpool; a cutting module configured to connect to a subsea wellhead, the cutting module comprising:
a wellhead connector having an actuatable lock and release mechanism, wherein the wellhead connector is actuatable from the drilling supply vessel;a motor assembly; anda cutter: and an umbilical line connecting, the cutting module to the drilling supply vessel, wherein the lifting device is used to raise and lower the cutting module connected to the drilling supply vessel through the moonpool, wherein the rigless abandonment system is configured to connect the cutting module to the subsea wellhead, cut a section of casing, and remove the subsea wellhead in a single umbilical line trip.