초록 ▼

Disclosed is a safety system for well testing, utilizing a new and novel bleedoff tool in the subsea test tree handling string, which provides rapid pressure reduction in the handling string and assures mechanical disconnect of the subsea test tree if the test tree cannot be disconnected hydraulical

Disclosed is a safety system for well testing, utilizing a new and novel bleedoff tool in the subsea test tree handling string, which provides rapid pressure reduction in the handling string and assures mechanical disconnect of the subsea test tree if the test tree cannot be disconnected hydraulically. The bleedoff tool is operated and opened to bleed pressure from the handling string by applying a predetermined torque. This tool may be extended by pull to transmit higher than opening torque and will transmit torque after opening. The bleedoff tool contains an internal valve, which closes when the bleedoff tool is opened, and retains fluids in the handling string. The bleedoff tool operating torque values are not changed by high internal pressures or great axial tension or compressive loads on the tool.

대표청구항 ▼

A safety system for testing underwater wells comprising: (a) a riser on a blowout preventer spaced above a landing shoulder in the well casing; and (b) a string of test pipe in the well casing and riser including a retainer valve spaced above a bleedoff tool having a piston, a body rotatably mounted

A safety system for testing underwater wells comprising: (a) a riser on a blowout preventer spaced above a landing shoulder in the well casing; and (b) a string of test pipe in the well casing and riser including a retainer valve spaced above a bleedoff tool having a piston, a body rotatably mounted and sealed around said piston and closed flow passage means therein, said passage means openable by relative rotation between said piston and body to permit flow between the inside of said bleedoff tool and said riser, said bleedoff tool spaced above a subsea test tree having an upper latch section releasably connectable to a lower body and said subsea test tree spaced above a hanger near the upper end of said string.