Subsea Mechanism to Circulate Fluid Between a Riser and Tubing String

摘要

A circulation mechanism in a subsea assembly is selectively actuated to allow fluid communication between the riser annulus and tubing string to immediately kill the well using heavy-weight fluid in the riser annulus; perform well control operations by adjusting the weight or other properties of fluid in the tubing string or riser annulus; and/or to circulate the riser of a deep-water well undergoing well testing or intervention.

主权项

1. A subsea assembly, comprising:
a tubing string extending within a riser, the riser having riser fluid therein and being connected to a blow-out preventer (“BOP”) positioned at a sea floor; a subsea test tree (“SSTT”) positioned along the tubing string; and a circulation mechanism positioned along the tubing string above the SSTT to allow selective communication of fluid between the tubing string and riser.