Patent ID: 9605490
Date: 2017-03-28
CPC Classifications: E21B

Claim:
1. A method, comprising: installing a marine riser to provide an initial conduit between a subsea blowout preventer mounted above a subsea wellhead and a surface drilling facility, the marine riser comprising an upper part and a lower part slidably coupled therewith; removing the upper part of the marine riser; after removal of the upper part of the marine riser, running a riser isolation tool through the lower part of the marine riser, the riser isolation tool comprising a body section having burst and collapse pressure ratings exceeding burst and collapse pressure ratings of the marine riser and, connected to the body section at a lower end thereof, a seal stinger; inserting the seal stinger into a receptacle seated in the wellhead to mount the seal stinger slidably in the receptacle, and sealing the seal stinger against an interior wall of the receptacle; and installing an upper blowout preventer between an upper end of the riser isolation tool and the surface drilling facility.