Blowout Preventer Landing Assist Tool (BLAT)
The BLAT (Blowout Preventer Landing Assist Tool) is used to assist in landing a BOP (Blowout Preventer) onto a subsea wellhead. The BLAT is threaded onto 6 5/8" drill pipe (FH or XT-57 Threads). This can be modified if necessary. The BLAT is then lowered through the Telescopic Joint (TJ), and landed into a Transition Joint, which is welded between the TJ and riser. The drill pipe is then rotated about 4 turns (CW or CCW, depending on customer request), which causes the BLAT's load arms to extend into the Transition Joints load slots.
Tension is then applied to the drill pipe, which raises the BLAT, TJ, Transition Joint, and BOP. The BOP is maneuvered into position on the subsea wellhead. The drill pipe is then rotated in the opposite direction which caused the BLAT's load arms to retract. The BLAT is then retracted back through the TJ, and retrieved.