EP 2440739 B1 20160309 - DUAL ROTARY CENTRALIZER FOR A BOREHOLE
Title (en)
DUAL ROTARY CENTRALIZER FOR A BOREHOLE
Title (de)
DOPPELDREHZENTRIERER FÜR EIN BOHRLOCH
Title (fr)
CENTREUR ROTATIF DOUBLE POUR UN TROU DE FORAGE
Publication
Application
Priority
- IN 2010000372 W 20100607
- IN 1164DE2009 A 20090608
Abstract (en)
[origin: WO2010143201A2] The present invention relates to an apparatus for use in a wellbore, which comprises two rotating bodies (1, 11) and a ring (4). The said rotating bodies rotate clockwise or anticlockwise on its own axis. Preferably, the present invention provides a dual rotary centralizer with a unique dual rotating design with an advantage of an integral stop. This combination enables a free rotation on the axis of the casing pipe which allows easy casing rotation while the dual rotary centralizer stays in its position onto the casing pipe eliminating altogether the need for stop collars. The clockwise and anticlockwise rotation of two bodies induces extra swirl action.
IPC 8 full level
E21B 17/10 (2006.01)
CPC (source: EP US)
E21B 17/1057 (2013.01 - EP US)
Citation (examination)
- CN 1932232 A 20070321 - ZHAO KECHANG [CN]
- DATABASE WPI Derwent World Patents Index; AN 2007-508404
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
DOCDB simple family (publication)
WO 2010143201 A2 20101216; WO 2010143201 A3 20110505; CN 102459803 A 20120516; CN 102459803 B 20140903; EP 2440739 A2 20120418; EP 2440739 B1 20160309; US 2012073803 A1 20120329
DOCDB simple family (application)
IN 2010000372 W 20100607; CN 201080024565 A 20100607; EP 10744741 A 20100607; US 200913376961 A 20090608