Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
LED package with top and bottom electrodes
Electronic system and method for compensating the dimensional accuracy of a 4-axis CNC machining system using global and local offsets
System and method for ensuring compliance with organizational policies
Collaborative system for capture and reuse of software application knowledge and a method of realizing same
Network attachment for IMS systems for legacy CS UE with home node B access
High power fiber amplifier with stable output
Selenium/group 3A ink and methods of making and using same
  Randomly Featured Patents
Truck payload storage enclosure
Camera system
Sharing sessions between web-based applications
Electronic component cooling system
Feed-water heater comprising low C-Cr-Mo steel components used under wet steam
Device for the protection against breakdown of an N+ type diffused region inserted in vertical-type semiconductor integrated power structure
Apparatus and method for processing audio signals recorded on a medium
Laser marking arrangements
Non-volatile SRAM memory cell equipped with mobile gate transistors and piezoelectric operation
Protocol integrating apparatus and method for telecommunications