US 9,809,888 B2
System, apparatus, and method for utilization of bracelet galvanic anodes to protect subterranean well casing sections shielded by cement at a cellar area
Mohammed H. Al-Mubasher, Qatif (SA)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Jul. 23, 2015, as Appl. No. 14/807,255.
Application 14/807,255 is a division of application No. 13/628,621, filed on Sep. 27, 2012, granted, now 9,127,369.
Claims priority of provisional application 61/540,849, filed on Sep. 29, 2011.
Prior Publication US 2015/0329974 A1, Nov. 19, 2015
Int. Cl. C23F 13/00 (2006.01); C23F 13/16 (2006.01); C23F 13/06 (2006.01); C23F 13/10 (2006.01); C23F 13/18 (2006.01); C23F 13/20 (2006.01); E21B 33/037 (2006.01)
CPC C23F 13/16 (2013.01) [C23F 13/06 (2013.01); C23F 13/10 (2013.01); C23F 13/18 (2013.01); C23F 13/20 (2013.01); E21B 33/0375 (2013.01); C23F 2213/21 (2013.01); C23F 2213/32 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An enhanced cathodic protection system for a subterranean well casing having an upper vertical well casing section thereof in a cellar area and one or more lower well casing sections below the cellar area, the cellar area being bounded by a cellar ring, the vertical well casing section in the cellar area defining a cellar-area well casing, the enhanced cathodic protection system comprising:
an impressed current cathodic protection system comprising a subterranean anode bed surrounded by a ground electrolyte in communication with the one or more of the lower well casing sections, the subterranean anode bed adapted to provide a first ion pathway through the ground electrolyte to the one or more of the lower well casing sections, the subterranean anode bed further being electrically connected to the subterranean well casing through one or more cables and one or more cathodic protection rectifiers to provide a first electron pathway to the subterranean well casing, the impressed current cathodic protection system providing primary cathodic protection to the subterranean well casing; and
an enhanced galvanic anode cathodic protection system comprising one or more bracelet anodes being circumferentially mounted to the cellar-area well casing and being surrounded by a cellar electrolyte, the cellar electrolyte being bounded by the cellar ring and also surrounding an outer surface of the cellar-area well casing, the one or more bracelet anodes circumferentially surrounding the cellar-area well casing and providing a second ion pathway through the cellar electrolyte to the cellar-area well casing, the one or more bracelet anodes further being electrically connected to the cellar-area well casing through one or more shorting screws to provide a second electron pathway to the subterranean well casing, the enhanced galvanic anode cathodic protection system providing secondary cathodic protection to the subterranean well casing;
wherein the impressed current cathodic protection system and the enhanced galvanic anode cathodic protection system operate simultaneously.