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1. US20090008086 - Centering structure for tubular member and method of making same

Office
United States of America
Application Number 12166719
Application Date 02.07.2008
Publication Number 20090008086
Publication Date 08.01.2009
Grant Number 7849918
Grant Date 14.12.2010
Publication Kind B2
IPC
E21B 17/10
EFIXED CONSTRUCTIONS
21EARTH OR ROCK DRILLING; MINING
BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
17Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings
10Wear protectors; Centralising devices
CPC
E21B 17/1021
EFIXED CONSTRUCTIONS
21EARTH DRILLING; MINING
BEARTH DRILLING, e.g. DEEP DRILLING
17Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables;; Casings; Tubings
10Wear protectors; Centralising devices ; , e.g. stabilisers;
1014Flexible or expansible centering means, e.g. with pistons pressing against the wall of the well
1021with articulated arms or arcuate springs
Applicants Davis-Lynch, Inc.
Inventors Ehlinger Jeff
Graen Larry
Agents Knobloch Charles S.
Arnold Gordon T.
Arnold & Knobloch, L.L.P.
Title
(EN) Centering structure for tubular member and method of making same
Abstract
(EN)

An apparatus and method for manufacture of a unitary centralizer forming Apertures are formed in a blank to create an intermediate blank having bow spring elements within a unitary centralizer and expanding a medial portion of the bow spring elements. An expansion element is inserted into the intermediate blank. An expansive force is applied to the expansion element, thereby expanding the medial portion of the bow spring elements. Mandrels placed against the upper and lower surfaces of the expansion element receive a compressive force for transfer to the expansion element. Set screw holes are placed on the unitary centralizer for attachment.


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