CENTRALIZING DEVICE FOR CENTERING ADDITIONAL CASING PIPE INSIDE MAIN CASING PIPE ON THE WELL Russian patent published in 2005 - IPC

Abstract RU 2263760 C1

FIELD: oil production equipment, particularly centralizing devices.

SUBSTANCE: centralizer device has cylindrical case of polyamide material having at least four ribs extending at 10-20° to longitudinal axis thereof so that channels are defined between the ribs. Inner diameter of cylindrical body exceeds outer diameter of casing pipe to be centered. Maximal diameter circle defined by ribs generator is less than inner diameter of main casing pipe. Direction of rib inclination is formed so that when liquid flows upwards towards direction of the pipes rotation during additional casing pipe spinning-up liquid flows may be deflected inside the channels.

EFFECT: decreased flow resistance inside the device.

2 dwg, 1 ex

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RU 2 263 760 C1

Authors

Ibragimov N.G.

Zakirov A.F.

Nikitin V.N.

Ozheredov E.V.

Dates

2005-11-10—Published

2004-11-26—Filed