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2 029 066

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IPC

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Application

5065170/03, 1992-06-30

(22)

Actual filing date

1992-06-30

(45)

Published

1995-02-20

(72)

Inventor

Gabdullin R.G.Zhzhonov V.G.Mansurov R.Kh.

(73)

Holder

Tatarskij Nauchno-Issledovatel'Skij I Proektnyj Institut Neftjanoj Promyshlennosti

DEVICE FOR STAGE CEMENTING OF WELL Russian patent published in 1995 - IPC

Abstract RU 2029066 C1

FIELD: stage cementing of wells. SUBSTANCE: device for stage cementing of well has body with side cementing openings. Casing is installed from outside and forms space together with body against side cementing openings. Arranged between body and casing is valve with ball shutoff member. Valve is located in the middle part of space to form upper and lower chambers together with body and casing. Upper chamber is communicated with external space, and lower chamber is communicated with body space. Ball shutoff member is located in lower chamber and made of flexible-deformable material for forcing into upper chamber. Pressure of forcing is determined from expression given in invention description. EFFECT: prevented getting of cement slurry filtrate to producing reservoir. 4 dwg

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RU 2 029 066 C1

Authors

Gabdullin R.G.

Zhzhonov V.G.

Mansurov R.Kh.

Dates

1995-02-20—Published

1992-06-30—Filed

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