FREE PISTON Russian patent published in 2008 - IPC E21B43/00 

Abstract RU 2318989 C1

FIELD: oil production, particularly oil and gas well operation with periodic working agent supply.

SUBSTANCE: free piston comprises cross-piece or T-joint, lift string, piston arranged inside the lift string, as well as upper and lower damping devices. Upper damping device comprises cantilever rod having outer diameter of central part exceeding that of lower part. Upper rod part has widened boss. Upper widened boss end is transversal to rod axis. Sealing members are arranged over the widened boss. Piston travel limiting plate is located in central rod part. The limiting plate has stop extensions arranged under orifices of cross-piece branches. Stop insert with orifice for stop connection is installed over the plate so that gap is defined between end surfaces of the plate and stop insert.

EFFECT: increased reliability and extended service life.

6 cl, 7 dwg

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RU 2 318 989 C1

Authors

Medko Vladimir Vasil'Evich

Mel'Nikov Igor' Vasil'Evich

Valiakhmetov Magsum Gajdmukhametovich

Isaev Aleksandr Anatol'Evich

Shuljatikov Igor' Vladimirovich

Shuljatikov Vladimir Igorevich

Dates

2008-03-10Published

2006-07-05Filed