CENTRALIZER

• US 3,643,739 A
• Filed: 09/06/1966
• Issued: 02/22/1972
• Est. Priority Date: 09/06/1966
• Status: Expired due to Term

• Current Assignee: John A. Hall Sr
• Original Assignee: John A. Hall Sr
• Inventors: Hall, John A. Sr.
• Primary Examiner(s): Brown, David H.
• Application Number:
  US04/577,364
• Time in Patent Office: 1,995 Days
• Field of Search: 166/172,173,213,241,202 308/4A 15/104.19
• US Class Current: 166/241.6
• CPC Class Codes: E21B 17/1028 with arcuate springs only, e.g. baskets with outwardly bowed strips for cementing operations

Abstract

The new centralizer for well casings consists of a pair of collars connected by bowed leaf springs of different curvature and in stacked or side-by-side arrangement for increasing the resistance of the bows to radial bending and for increasing the radial extent of the centralizer.

Claims

1. A centralizer comprising a plurality of collars disposed coaxially for reception about a pipe insertable in an orifice, first bowed leaf springs connecting said collars, and other bowed leaf springs with their ends mounted on said first springs intermediately thereof.

2. A centralizer as described in claim 1 in which at least one of said other leaf springs is radially stacked on at least one of said first springs.

3. A centralizer as described in claim 2 further including fin elements projecting from at least some of said leaf springs for diverting materials flowing therepast.

4. A centralizer as described in claim 3 in which said first leaf springs are arranged in longitudinal groups and each of said other leaf springs is mounted on intermediate portions of a pair of said first springs.

5. A centralizer as described in claim 4 in which three or more of said coaxial collars are provided, said first leaf springs being arranged in longitudinally aligned groups with each spring of a group connecting an adjacent pair of collars.

6. A centralizer as described in claim 5 further including third leaf springs superposed respectively on said other leaf springs.