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
Wireless control system for a patient support apparatus
Suspension with flexure having laminated structure and bonding pads on opposing surfaces thereof, and head gimbal assembly and disk drive unit with the same
Detachably integrated battery charger for mobile cell phones and like devices
Stack and folding-typed electrode assembly and method for preparation of the same
Systems and methods for performing live chat functionality via a mobile device
Variants of a family 44 xyloglucanase
5-lipoxygenase-activating protein (FLAP) inhibitors
  Randomly Featured Patents
3-Propionylsalicylic acid derivatives and process for the preparation of the same
Collagen material and its production process
Image forming device for both unbound and bound originals
Apparatus for installing wooden decking
Hydrocarbon conversion using zeolite SSZ-58
Electric violin
Physical layer loop back method and apparatus
Liquid crystal device
Internal antenna of small volume
Molded foam spring seat