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
Laser marking of a card
Precoding codebooks for MIMO communication systems
Integrated circuit devices having conductive structures with different cross sections
Fail-safe upgrading of portable electronic device software
System and method for providing radio communication in a land mobile radio system
Single integrated circuit configured to operate both a capacitive proximity sensor device and a resistive pointing stick
Active constant power supply apparatus
  Randomly Featured Patents
Electronic component for a sensor apparatus, sensor apparatus and method of configuring a sensor apparatus
Apparatus for mounting a crop-cutting device on a pivotal feed rake
Piezoelectric thin film device having a drive section with a weighted portion
Refrigeration cycle having an evaporator for evaporating residual liquid refrigerant
Advertising panel
2-piperidone compounds
Citronellyl and/or dihydrocitronellyl lactates, their preparation and their use
Chain saw components and system for cutting masonry and the like
Alkaline storage battery
Apparatus for low cost water disinfection