Wells – With below and above ground modification – Eduction pump or plunger in well
Patent
1985-03-15
1986-12-23
Novosad, Stephen J.
Wells
With below and above ground modification
Eduction pump or plunger in well
166364, 166368, 166341, E21B 4301
Patent
active
046306803
ABSTRACT:
A method and apparatus is disclosed for controlling a well drilled from a floating drilling vessel during the time that the marine riser is removed and conductor casing is being lowered and cemented into the well. An annular blowout preventer having a bore substantially equal to that of the structural casing is provided in a stack above the structural casing wellhead housing. A kill line is provided to the drilling vessel and is connected to the wellbore conduit below the blowout preventer. A marine riser is attached to the top of the blowout preventer through which the hole to be lined with conductor casing is drilled. The well is established to a depth of about one thousand (1000) feet below the seabed.
The annular blowout preventer is closed, the marine riser is removed, and a stripper and guidance assembly is landed on the top of the blowout preventer in preparation for lowering the conductor casing in the well. The conductor casing, with a second wellhead housing attached to the top thereof, is stripped into the well, the second wellhead housing landing within the structural casing wellhead housing. The conductor casing is then cemented in the hole.
Well pressure is monitored by means of a surface disposed pressure gauge attached to the top of the kill line. Excess well pressure is relieved by means of the kill line or by means of a vent valve provided in the structural casing wellhead housing.
REFERENCES:
patent: 3548934 (1970-12-01), Hutchison
patent: 3554277 (1971-01-01), Bauer
patent: 4046191 (1977-09-01), Neath
patent: 4387771 (1983-06-01), Jones
patent: 4405016 (1983-09-01), Best
Bui Thuy M.
Hydril Company
Novosad Stephen J.
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