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2 054 523

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C1

(51)

IPC

(21) (22)

Application

92007792/03, 1992-11-24

(22)

Actual filing date

1992-11-24

(45)

Published

1996-02-20

(72)

Inventor

Shajakhmetov Sh.K.Gabdullin R.G.

(73)

Holder

Tatarskij Gosudarstvennyj Nauchno-Issledovatel'Skij I Proektnyj Institut Neftjanoj Promyshlennosti

DEVICE FOR SEGREGATION OF DRILL STRING-CASING ANNULUS Russian patent published in 1996 - IPC

Abstract RU 2054523 C1

FIELD: gas and oil producing industry. SUBSTANCE: device for segregation of drill string-casing annulus is provided with nonsolidifying filler possessing plugging properties located in chamber above piston between sealing collars. It is arranged in body height with filler particles reducing in size from top to bottom. EFFECT: higher reliability and longer service life. 2 dwg

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RU 2 054 523 C1

Authors

Shajakhmetov Sh.K.

Gabdullin R.G.

Dates

1996-02-20—Published

1992-11-24—Filed

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