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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.

Slide-1: BLAT Lowered Through Telescopic Joint

Slide-2: BLAT Load Arms Extend Into Transition Joint

Slide-3: BLAT Load Arms Are Retracted

Slide-4: BLAT Retracted through Telescopic Joint

Slideshow Explanation

Slide-1: The BLAT (gold) is suspended on drill pipe, and is lowered through the Telescopic Joint (TJ) (red). The BLAT's                 anti-torque lugs (purple) slide into the Transition Joint's (blue) anti-torque slots (orange). The Transition                 Joint is welded between the TJ and Riser (Purple).
Slide-2: The BLAT has landed in the Transition Joint, and held in place by the BLAT's anti-torque lugs.
Slide-3: The drill pipe connected to the BLAT is rotated, and the BLAT's load arms (cyan) extend into the Transition                 Joint's load slots (green).
Slide-4: After the BOP has been landed and secured on a subsea wellhead, the drill pipe connected to the BLAT is                 rotated in the opposite direction, and the BLAT's load arms retract. The BLAT is then extracted through the TJ.

BLAT Components

A section view of the BLAT is shown below. Shown are the outer case, link bars, middle plate, top breech lock cap, anti- torque lugs, the drill pipe sub, nut

assembly, threaded rod, load arms, load pins, load bracket, and anti-torque rods.

BLAT Stress Report

CLICK ON THIS LINK TO VIEW THE BLAT STRESS REPORT. THIS REPORT WAS PRODUCED WITH MAPLE 16.