Cementing portion of conductor string

Boring or penetrating the earth – Boring a submerged formation

Patent

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Details

166285, 166359, E21B 712, E21B 1909, E21B 3413

Patent

active

047038136

ABSTRACT:
An apparatus and method useful in offshore well drilling operations for cleaning the annular space between mudline suspension risers during and after cementing operations to assure that riser backout may be accomplished if a temporary abandonment of a well is to take place. A two-section drive pipe having a quick stab connector between the upper and lower sections of the pipe is provided with ports around the periphery of the lower section and above the mudline. Circulation of fluid down high pressure hoses connected to these ports and up the annulus between the drive pipe and well conductor string within the drive pipe is established using rig pumps located on the deck of the rig. Simultaneously, cement slurry is pumped down the well conductor string to the bottom of the well and up the annulus between the drive pipe and well conductor string. Once either returns of diluted cement slurry discharged from the annulus are observed at the deck of the rig or a predetermined quantity of cement slurry has been pumped down the well conductor string, the pumping of cement slurry is stopped. Circulation of the liquid down the high pressure hoses and up the annulus is continued until substantially all cement which would foul-up the disconnection of well equipment above the ocean floor has been washed out of the annulus.

REFERENCES:
patent: 2852078 (1950-09-01), Krause, Jr.
patent: 4095437 (1978-06-01), Lox
patent: 4201074 (1980-05-01), Lox
patent: 4334582 (1982-06-01), Baker et al.

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