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Delta Engineering
Mechanical and Ocean Solutions

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.

BLAT with Termination Joint

BLAT Annimation

Click on the image below to see an animation the BLAT's basic functions, which include the BLAT's trip through the Telescopic Joint, landing in the Transition Joint, the Load Supports extending and retracting as the Drill Pipe is rotated.

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BLAT Animation Link

BLAT Stress Report

Click on the image below to see the BLAT stress report, which shows that the BLAT's load bearing components meet the specified margin of safety when the BLAT is loaded with its design load of 2000 kips.

Click the image below for

the BLAT Stress Report