Patent ID: 6186237
Filing Date: 2001-02-13
Classification: E21B

Abstract:
A method for installing a tubing hanger in a subsea wellhead, the tubing hanger having a production bore and an offset tubing annulus bore extending therethrough, the wellhead being in communication with a vessel at the surface via a riser which contains a blowout preventer, the method comprising:(a) installing a valve in the annulus bore;(b) securing the tubing hanger to a running tool;(c) opening the valve with the running tool, securing the running tool to a monobore conduit, lowering the tubing hanger through the riser with the conduit, and setting the tubing hanger in the wellhead; then(d) installing a retrievable production plug in the production bore;(e) releasing the running tool from the tubing hanger and closing the valve; then(f) determining if the valve leaks; and if so,(g) installing an annulus plug in the annulus bore; and wherein step (f) comprises:lifting the running tool from the tubing hanger; thenclosing the blowout preventer around the conduit, creating a chamber within the riser in communication with the annulus bore; thenmonitoring pressure in the chamber through a choke and kill line incorporated with the riser.