Well apparatus

Patent · Tue Aug 11 00:00:00 EDT 1987

OSTI ID:6069574

Raulins, G M

For use performing operations within a subsea well by means of a pipe string which is lowered through a conductor depending from pressure control equipment at the water surface and releasably connected at its lower end to a blowout preventer stack, the string has means for landing upon the head of the well on which the stack is mounted for depending therefrom into the well bore, and means for selectively closing the lower end of the string upon release and raising of the upper end of the string thereabove; a lubricator valve including a body having a bore therethrough connectible as a part of the upper end of the string near the lower and thereof, so that it may be raised and lowered within the bore of the stack, guideways in the body extending from the bore therethrough, rams slidable in the guideways between positions opening and closing the bore of the body, cylinders in the body, pistons reciprocable in the cylinders and connected to the rams for moving them between opened and closed positions, and means responsive to the supply and exhaust of control fluid from a source at the surface level for causing the pistons to move the rams between opened and closed positions.

• Assignee: NOV; EDB-87-167851; NOV-87-076111
• Patent Number(s): US 4685521
• OSTI ID: 6069574
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
42 ENGINEERING
420206 -- Engineering-- Mining & Drilling Equipment & Facilities-- (1980-1989)
423000 -- Engineering-- Marine Engineering-- (1980-)
BLOWOUT PREVENTERS
CONTROL
CONTROL EQUIPMENT
CYLINDERS
DRILL BITS
DRILL PIPES
DRILLING
DRILLING EQUIPMENT
EQUIPMENT
FLOW REGULATORS
HOISTING
LUBRICATION
MATERIALS HANDLING
NATURAL GAS WELLS
OFFSHORE DRILLING
OIL WELLS
PIPES
PISTONS
PRESSURE CONTROL
VALVES
WELLS