Inner String Running Tool
When an inner string is run in a deep water application where the casing string exceeds the water depth and is across the sub sea blow out preventer stack, a situation exist where a well control problem would be extremely dangerous. This is particularly true when running fill-up float equipment and where the casing string or the casing string and inner string can not be sheared by the sub sea preventer system.
To keep the casing string full and to provide a method of circulating fluid through the casing a Inner String Running Tool a new tool is now available. This Inner String Running Tool lands in a sub sea hanger to provide an anchor and seal in the hanger. It also a method of sealing on the inner string so that mud can be circulated through the inner string, in the inner string/casing annulus or the casing/riser annulus.