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
Methods and systems for direct memory access (DMA) in-flight status
Method and apparatus for the transmission of data via a bus network using the broadcast principle
Flexible account reconciliation
PCI-express data link transmitter employing a plurality of dynamically selectable data transmission priority rules
Lamp with phosphor composition for improved lumen performance, and method for making same
Docking audio
Controlled porous osmotic pump tablets of high permeable drugs and the preparation process thereof
  Randomly Featured Patents
Sample cooler
Ethylenically unsaturated compounds
Container dome
Hand-held style watch display box
Ball stud
Integrated FET circuit to reduce switching noise
Self-powered medical device
Tile making apparatus
Media recording device with remote graphic user interface
Circuit for sensing individual leg current in a motor controller using resistive shunts