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Application

99119705/03, 1999-09-14

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Start date

1999-09-14

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Actual filing date

1999-09-14

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Published

2002-01-20

(72)

Inventor

Vjakhirev V.I.Shamanov S.A.Dorodnov I.P.Jakovenko A.A.

(73)

Holder

Dochernee Obshchestvo S Ogranichennoj Otvetstvennost'Ju Burovaja Kompanija Oao

DEVICE FOR FILLING OF CAVERNS WITH CEMENT GROUT Russian patent published in 2002 - IPC

Abstract RU 2178512 C2

FIELD: well drilling, particularly, devices for filling of annular space of cavernous wellbore with cement grout. SUBSTANCE: device consists of tube with springs and collar secured to it by means of fastening rings. Fastening rings are secured by pins. Upper fastening ring is made in the form of member embracing springs. Upper ends of springs are movable in axial direction during their compression. Collar has ports closed from internal side by plate flexible valves for pumping cement grout through them and their closing after completion of cement grout pumping. EFFECT: higher quality of well casing due to more complete filling of annular space of cavernous wellbore with cement grout. 2 dwg

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RU 2 178 512 C2

Authors

Vjakhirev V.I.

Shamanov S.A.

Dorodnov I.P.

Jakovenko A.A.

Dates

2002-01-20—Published

1999-09-14—Filed

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