DEVICE FOR DRAINING FLUID FROM TUBING STRING Russian patent published in 1994 - IPC

Abstract RU 2014438 C1

FIELD: oil industry. SUBSTANCE: device has differential piston axially movable in case. Hollows on piston bigger stage side are hydraulically connected with tubing hollow, and those on piston smaller stage side - with annulus. EFFECT: operating capacity widened, reliability increased, operating cost cut down. 1 dwg

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RU 2 014 438 C1

Authors

Osipov S.N.

Pjatkin N.N.

Rashkevich A.V.

Rylov B.M.

Dates

1994-06-15—Published

1991-06-04—Filed