Multi-stage rabbit

Details Multi-stage rabbit Multi-stage rabbit

1975-09-29

1977-06-21

Freeh, William L.

Pumps

Drilled well free piston-type pump

F04B 4712

Patent

active

040308588

ABSTRACT:
Two or more independently expansible packer devices mounted on the mandrel of a free piston plunger assembly are axially separated by intermediate spacer sleeves through which the packer devices are keyed to the mandrel. Flow-conducting gaps between arcuate segments of the packer devices extend at an angle to the axis of the mandrel to impart rotation to the plunger assembly during axial reciprocation.

REFERENCES:
patent: 1393953 (1921-10-01), Miller
patent: 1855554 (1932-04-01), LaBrie
patent: 1976151 (1934-10-01), Thaheld
patent: 2684633 (1954-07-01), Knox
patent: 3150596 (1964-09-01), Knox
patent: 3424066 (1969-01-01), Moore, Jr.
patent: 3451067 (1969-06-01), Jordan

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