Drill ahead tool

Details Drill ahead tool Drill ahead tool

1988-06-01

1989-03-21

Novosad, Stephen J.

Boring or penetrating the earth

Boring a submerged formation

Boring from floating support with submerged independent...

166340, 166365, 175107, 175171, E21B 7124, E21B 720

Patent

active

048134961

ABSTRACT:
A drill ahead tool for drilling the initial portion of a subsea well allows an operator to drill ahead after running conductor pipe. The running tool locates in the wellhead housing secured to the upper end of the string of conductor pipe. The running tool has a mandrel that connects into the string of drill pipe. The mandrel locates in a sleeve. The sleeve locates in a body of the running tool. The body has dogs which engage a groove in the wellhead housing to secure the running tool to the wellhead housing while the conductor pipe is being run. The sleeve has a cam on its exterior for maintaining the dogs in the extended position. The drill pipe rotates the sleeve to advance the cam to allow the dogs to be retracted. The mandrel and sleeve have a J-slot and pin that allow the mandrel to be released from the sleeve to continue drilling ahead.

REFERENCES:
patent: 3262508 (1966-07-01), Price
patent: 3376922 (1968-04-01), Leonhardt, Jr.
patent: 3732143 (1973-05-01), Joosse
patent: 3901331 (1975-08-01), Djurovie
patent: 3973635 (1976-08-01), Gatlin et al.
patent: 4759413 (1988-07-01), Bailey et al.

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