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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), which can be modified per customer request. The BLAT is then lowered through the Telescopic Joint (TJ), until the BLAT's Anti-Torque Boss makes contact with the Pup Transition Joint (PTJ). The PTJ is bolted between the TJ and riser. Rotating the drill pipe CW or CCW causes the BLAT's load arms to extend or retract. When extended, the load arms make contact with the PTJ's inner surface, allowing tension to be applied to the drill pipe, which lifts the TJ, PTJ, BLAT, Riser, and BOP. The BLAT has a Safe Working Load of 2,000 kips.

The PUP TRANSITION JOINT (PTJ) is made from a Transition Joint, supplied by Delta Engineering, and Pup Joint, supplied by the customer. A section of riser pipe is removed from the pup joint, equal to the length of the Upper and Lower Transition Joint (about 44.5 inches), and the Transition Joint is welded into the 44.5 inch space.

BLAT LANDED IN BLAT TRANSITION PUP JOINT

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BLAT Animation

Click on the image below to see an animation of the BLAT's basic functions, which include rotating

Click the image for the

BLAT Animation Link

the drill pipe CCW and CW to make the BLAT's load support lugs extend and retract, lifting riser and TJ, lowering the riser and TJ, and then rertrieving the BLAT.

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 safe working load of 2,000 kips.

CLICK THE IMAGE BELOW FOR THE BLAT STRESS REPORT