Valve for well testing and sampling string - has closure bias increased by annulus pressure and is operable by increasing annulus press
Номер патента: DE2616823A1
Опубликовано: 30-12-1976
Автор(ы): Burchus Quinton Barrington, David Lee Farley, Robert Terrell Evans
Принадлежит: Halliburton Co
Опубликовано: 30-12-1976
Автор(ы): Burchus Quinton Barrington, David Lee Farley, Robert Terrell Evans
Принадлежит: Halliburton Co
Реферат: A valve for use in a well testing tool is arranged to be exposed to the pressures interiorly and exteriorly of the tool and while these pressures are equal assumes an open position in which it allows the exterior pressure to act to increase the bias applied to an actuator, e.g. a test valve actuator, in the tool. Upon setting a packer below the tool and increasing the pressure exteriorly thereof, the valve assumes a closed position in which further increases in exterior pressure are not effective to increase the bias applied to the actuator but are effective to displace the actuator against the existing bias, e.g. to open the test valve.
Pressure operated isolation valve for use in a well testing and treating apparatus, and its method of operation
Номер патента: CA1036489A. Автор: Burchus Q. Barrington,David L. Farley. Владелец: Halliburton Co. Дата публикации: 1978-08-15.