Well pressure compensation for blowout preventers

Patent · Tue Apr 03 04:00:00 EST 1984

OSTI ID:6645197

LeMoine, J L

A method and apparatus of compensating for the closing force on a blowout preventer caused by well pressure for reducing the wear on the blowout preventer sealing element when moving a drill string through a closed blowout preventer is claimed. A hydraulic opening force is applied to the blowout preventer which is actuated by and is proportional to the well pressure. A compensating line is connected between the blowout preventer fluid supply line and the blowout preventer opening line. A control valve is provided in the compensating lines for applying an opening force on the blowout preventer and a pilot control pressure regulator is provided in the compensating line for limiting the compensating pressure. The pilot control line is connected between the regulator and the well pressure in the blowout preventer whereby the output pressure is proportional to the well pressure for compensating for the closing force on the blowout preventer caused by the well pressure.

• Assignee: Koomey, Inc.
• Patent Number(s): US 4440232
• OSTI ID: 6645197
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
BLOWOUT PREVENTERS
CONTROL
CONTROL EQUIPMENT
DESIGN
DRILL PIPES
DRILLING EQUIPMENT
DYNAMIC LOADS
EQUIPMENT
FLUID MECHANICS
HYDRAULICS
MECHANICS
PIPES
PRESSURE CONTROL
RESERVOIR PRESSURE
SEALS
WEAR
WELL PRESSURE