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06071 CATHODIC PROTECTION OF WELL CASINGS USING E-LOG I CRITERIA

Picture for 06071 CATHODIC PROTECTION OF WELL CASINGS
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Product Number: 51300-06071-SG
ISBN: 06071 2006 CP
Author: Ernest W. Klechka, P.E., Gerhardus H. Koch Ph.D., Angel R. Kowalski, Abdul Wahab Al-Mithin, Emad Al-
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For well casings it is difficult to directly measure cathodic protection potentials along the length of the well casing. The E-log I criterion is described in RP0186-2001 (1) “Application of Cathodic Protection for External Surfaces of Steel Well Casings”, which stated that adequate protection is achieved with “a voltage at least as negative (cathodic) as that originally established at the beginning of the Tafel segment of the E-log I curve. This voltage shall be measured between the structure surface and a saturated copper-copper sulfate half cell contacting the electrolyte.” In order to establish the proper current density for weld, E-log I testing was conducted on several wells. The results of well testing are presented. The test results were in good agreement with the 1.0 µA/cm 2 used for design of the test.

Key words: Cathodic Protection, E-log I, Tafel

For well casings it is difficult to directly measure cathodic protection potentials along the length of the well casing. The E-log I criterion is described in RP0186-2001 (1) “Application of Cathodic Protection for External Surfaces of Steel Well Casings”, which stated that adequate protection is achieved with “a voltage at least as negative (cathodic) as that originally established at the beginning of the Tafel segment of the E-log I curve. This voltage shall be measured between the structure surface and a saturated copper-copper sulfate half cell contacting the electrolyte.” In order to establish the proper current density for weld, E-log I testing was conducted on several wells. The results of well testing are presented. The test results were in good agreement with the 1.0 µA/cm 2 used for design of the test.

Key words: Cathodic Protection, E-log I, Tafel

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