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2 176 719

(13)

(51)

IPC

(21) (22)

Application

99106818/03, 1999-03-30

(24)

Start date

1999-03-30

(22)

Actual filing date

1999-03-30

(45)

Published

2001-12-10

(72)

Inventor

Mavljutov M.R.Levinson L.M.Bolezin B.K.Stepanov R.V.Khamidullin F.Kh.Kilin V.G.Stepanov R.R.

(73)

Holder

Otkrytoe Aktsionernoe Obshchestvo Oao

CASING STRING CENTRALIZER Russian patent published in 2001 - IPC

Abstract RU 2176719 C2

FIELD: cementing of casing-borehole annular space, particularly, centering of casing string in borehole. SUBSTANCE: casing string centralizer has continuous working cylinder with piston located on casing, centering levers, spring split ring and destructible plugs. Cylinder upper end is rigidly connected with casing. Piston lower end is conical and engageable with levers. Spring split ring is installed in radial recesses of levers. EFFECT: simplified design and higher operating reliability. 3 cl, 3 dwg

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RU 2 176 719 C2

Authors

Mavljutov M.R.

Levinson L.M.

Bolezin B.K.

Stepanov R.V.

Khamidullin F.Kh.

Kilin V.G.

Stepanov R.R.

Dates

2001-12-10—Published

1999-03-30—Filed