Resources Contact Us Home
Mechanical lockout for pressure responsive downhole tool

Image Number 7 for United States Patent #5518073.

An improved mechanical system selectively locks the tester valve of an annulus pressure responsive tester valve in position for an indeterminate number of well annulus pressure cycles. The tester valve can be closed upon demand. The forces which accomplish opening of the ball valve act across a power piston, but the forces which close the valve act across an actuating piston. The tester valve can be run into a well with an operating element of the tester valve in a first position, such as a closed position. Upon reaching the desired depth within the well and setting of an associated packer system, well annulus pressure is then increased to a first level above hydrostatic pressure to move the power piston and thus move the tester valve to an open position. During a normal mode of operation, well annulus pressure can be cycled between hydrostatic pressure and the first level to open and close the tester valve. A fluid transfer assembly is included within the power piston which is operable to transfer fluid across the power piston. The tester valve also features a multi-range metering cartridge which is operable to meter fluid over a wide range of differential pressures.

  Recently Added Patents
Pet bed
Polypeptide microparticles
Measurement and uses of oxidative status
Electronic product design
Poloxamer foamable pharmaceutical compositions with active agents and/or therapeutic cells and uses
Wafer recycling method
Data processor and scanner device
  Randomly Featured Patents
Rear bumper for a vehicle
Medical diagnostic ultrasound transducer and method of manufacture
Antistatic layered panel and method of its manufacture
Control of cell arrangement
Low-voltage sense amplifier and method
Connector apparatus and system including connector apparatus
Airbag device
Liquid crystal display comprising protrusion structure having same material, same layer but lower height than pillar-shaped spacer
Hybrid module for interconnecting an engine and a dual-clutch transmission