A NEW METHOD FOR CALCULATING THE DOWNHOLE CATHODICPROTECTION POTENTIALS OF WELL CASINGS

J Chin Soc Corr Pro

2001, Vol. 21

Issue (6): 363-367 DOI:

Research Report

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A NEW METHOD FOR CALCULATING THE DOWNHOLE CATHODICPROTECTION POTENTIALS OF WELL CASINGS

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中国科学院金属研究所金属腐蚀与防护国家重点实验室

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Abstract Although cathodic protection has been widely applied to oil well casings,it is a challenging job to determine the cathodic protecti on level of well casings at any depth without interruption of production. In thi s paper,a new method was established to calculate the potential distribution of well casing cathodic protection with several wellhead electrical measurements(i ncluding the applied current,the cathodic protection potential and the native-s tate potential) and well completion data(such as lengths and unit length resista nces of outer and inner casing). When the method was applied to Well A in Texas, the excellent agreement was obtained between measured and calculated cathodic p rotection potentials,the maximum percent difference was less than 2%.

Key words: casing cathodic protection calculation method

Received: 14 October 2000

ZTFLH:

TG174.5

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. A NEW METHOD FOR CALCULATING THE DOWNHOLE CATHODICPROTECTION POTENTIALS OF WELL CASINGS. J Chin Soc Corr Pro, 2001, 21(6): 363-367 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2001/V21/I6/363

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