Downhole, hydraulically actuated pump assembly with pressure set

Details Downhole, hydraulically actuated pump assembly with pressure set Downhole, hydraulically actuated pump assembly with pressure set

1979-12-17

1982-03-23

Casaregola, Louis J.

Pumps

Drilled well free piston-type pump

166202, 277 30, 277 34, 2771166, 417555A, F04B 4712

Patent

active

043210155

ABSTRACT:
A packer nose assembly for a downhole, hydraulically actuated pump of the free-type. The packer nose assembly is connected to the upper end of the pump device, and includes a packer apparatus interposed between the pump and a pair of seal cups. The seal cups are identical in construction and inverted respective to one another. The seal cups and the packer device are of annular construction and are telescopingly received in axially aligned relationship upon a mandrel. The mandrel is attached to the upper end of the pump. The cups enable the entire pump assembly to be pumped into and out of a borehole. The pump is circulated downhole through a power oil tubing string where the inlet end of the pump is seated against a conventional seating shoe. Thereafter, power fluid flows down the tubing and into the upper end of the mandrel, and through the central passageway of the mandrel to the valve assembly of the pump engine. At the same time, the lower cup assembly acts as a piston and reciprocates respective to the mandrel, and abuttingly engages one end of the packer apparatus. This reciprocal action causes compression of the opposed ends of the packer device, which in turn outwardly expands a packer rubber, so that the annular area between the packer nose assembly and the power oil string is positively and efficiently packed off. This action biases the entire pump assembly into seating engagement respective to the shoe, and at the same time anchors the pump downhole in an improved manner.

REFERENCES:
patent: 1883053 (1932-10-01), Standlee
patent: 2714855 (1955-08-01), Brown
patent: 3456724 (1969-07-01), Brown
patent: 3554279 (1971-01-01), Meripol et al.
patent: 3915595 (1975-10-01), Roeder
patent: 3957400 (1976-05-01), Roeder

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