Patent Number: 6,253,854

Title: Emergency well kill method

Abstract: A method for installing a string of tubing in a subsea well has a provision for killing the well due to malfunction while the tubing is being installed. A running tool is attached to a tubing hanger located at the upper end of the string of tubing. A completion safety module secures to the running tool and to a monobore running string. The assembly is lowered through a riser into the well, with the tubing hanger landing in a production tree. After the tubing hanger has been secured to the tree, earth formation pressure is communicated to the interior of the string of tubing while the running tool still remains connected to the tubing hanger. If a problem occurs, and the valves of the completion safety module fail to open, rams of the riser blowout preventer are closed around the running tool. The running tool is then disconnected from the tubing hanger and allowed to move upward a short distance due to pressure in the well. Then, a kill fluid is pumped down a choke-and-kill line into the riser at a point below the rams. The kill fluid flows through the flow path between the running tool and the tubing hanger and down the string of tubing to kill the well.

Inventors: Fenton; Stephen Paul (Inverurie, GB)

Assignee: ABB Vetco Gray, Inc.

International Classification: E21B 34/00 (20060101); E21B 33/03 (20060101); E21B 34/04 (20060101); E21B 33/043 (20060101); E21B 033/076 (); E21B 043/12 ()

Expiration Date: 07/03/2018