Hydraulic unloading and circulating device

Details Hydraulic unloading and circulating device Hydraulic unloading and circulating device

1976-11-15

1977-09-13

Freeh, William L.

Pumps

Including separate port on noncyclic valve for draining pump...

417554, F04B 3912, F04B 2100

Patent

active

040478530

ABSTRACT:
The hydraulic unloading and circulating device is adapted to be inserted in a threaded joint of a well tool connected to sucker rods and including a pumping tube surrounding said tool and supported on the end of a pipe string through which said sucker rods extend, for passing fluid between the exterior of the tool and interior of the pumping tube and pipe string to the interior of the tool and well annulus to thereby relieve the difference of hydrostatic pressure between fluid in the well annulus and interior of the pumping tube and pipe string. The device itself includes a housing with a telescoping mandrel having a straight through passage and lateral port, which, when the mandrel is telescoped in the housing to a first telescoped position, the port is eclipsed and when the mandrel is telescoped upwardly from the housing to a second telescoped position, the port is exposed to thereby effect communication between fluid in the pipe string and the well annulus. Before the mandrel can be moved to its second telescoped position to effect the hydraulic static pressure equalization, it must be rotated through a given number of degrees.

REFERENCES:
patent: 1672687 (1928-06-01), Penrod
patent: 1801209 (1931-04-01), Roark
patent: 3384179 (1968-05-01), Haines
patent: 3448805 (1969-06-01), Brown
patent: 3990509 (1976-11-01), Hodgecock

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