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
Round carrying case
Plants and seeds of hybrid corn variety CH336383
Managing method and apparatus for servicing contents provided by content provider
Adaptive frame scanning scheme for pulsed X-ray imaging
Fuser member having composite outer layer
Information processing apparatus and method
Method for producing lactamates by way of thin film evaporation
  Randomly Featured Patents
Drapery bow ring
Air tool
Image forming apparatus with gamma conversion means
Method and means for variable length coding
Separation of uranium isotopes by accelerated isotope exchange reactions
Method and device for detecting reliability of a field of movement vectors
Stain-resistant antimony organic sulfur-containing compounds and vinyl halide resins containing same
Unique double bladed utility knife
Photoelectric conversion device with voltage source means
Throttle opener device for vehicle engines