[12] Patent
[11] Patent No.:GC0004580  
[45] Date of Publishing the Grant of the Patent: 31/Dec /2016                32/2016  
Number of the Decision to Grant the Patent:2016/90298
Date of the Decision to Grant the Patent:28/Dec/2016

[21] Application No.:GC 2012-22363

[22] Filing Date:26/9/2012

[30] Priority:

[33] State [32] Priority date [31] Priority No.
US
29/9/2011
61/540.849

[72] Inventor: Mohammed H. Al-Mubasher

[73] Owner: Saudi Arabian Oil Company , 1 Eastern Avenue, 31311, Dhahran, Saudi Arabia

[74] Agent: Abu-Gazaleh Intellectual Property L.L.C

  

 

  

[51]IPC:
Int. Cl.: E21B41/02, C23F13/00 (2006.01)

[56] Cited Documents:

-GB 2 050 427 A (G LOBAL CATHODI C PROTECTION LTD) 7 January 1981
-WO 03/102268 Al (AFFAERSV ERKET SVENSKA KRAFTNAE [SE]; SANDBERG BERTI L [SE]; FORSSAND ER) 11 December 2003
-US 6 858 117 B2 (BERTON HUGU ES [FR] ET AL) 22 February 2005
-US 2005/284771 Al (DAVID FI LHO HELIO M [BR] ET AL DAVID FI LHO HELIO MARI NS [BR] ET AL) 29 December 2005
 
Examiner: Eng. Imad A. AlAhaidib

[54] SYSTEM, APPARATUS, AND METHOD FOR UTILIZATION OF BRACELET GALVANIC ANODES TO PROTECT SUBTERRANEAN WELL CASING SECTIONS SHIELDED BY CEMENT AT A CELLAR AREA
[57] Abstract: A cathodic protection system is provided for a subterranean well casing having an enclosed upper section of the well casing being substantially shielded by a cellar from an impressed-current cathodic protection circuit passing through earth media. The impressed-current cathodic protection circuit is provided to protect an unenclosed lower section of the well casing. To protect the enclosed upper section of the well casing, a supplemental cathodic protection circuit is provided. The supplemental cathodic protection circuit is a galvanic anode cathodic protection circuit comprising the enclosed upper section of the well casing and one or more bracelet galvanic anodes being circumferentially mounted to the enclosed upper section. The enclosed upper section of the well casing and the one or more bracelet galvanic anodes are substantially surrounded by a cellar backfill, and the galvanic anode cathodic protection circuit is equally effective throughout a broad range of non-homogeneity within the cellar backfill.
No. of claims: 23     No. of figures: 7


 

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