«Onshore and offshore oil and gas well construction»

Scientific substantiation of the efficiency criteria of electrochemical protection against corrosion of the external surface of wells production columns

UDC: 622.276
DOI: -

Authors:

¹ Gazprom, Moscow, Russia
² Ukhta State Technical University, Ukhta, Russia

Keywords: casing and production string, well, corrosion protection, electrochemical protection, performance criteria, cathodic protection

Annotation:

The authors of the article stress the importance of criteria for protecting underground steel structures from corrosion. Domestic and foreign documents regulating methods that are applied for revealing the effective cathodic protection systems for underground structures, including pipelines and wells, have been analyzed. The classification of the criteria of cathodic protection effectiveness is determined as well as the advantages and disadvantages of the existing evaluation methods, including direct and indirect measurements. It has been established that modern domestic documents lack information about the design features of cathodic protection of casing and production strings of wells. It is believed that it does not differ significantly from the design of cathodic protection of other underground structures, for example, pipelines. In addition, the established requirements often do not allow assessing the effectiveness of electrochemical protection against corrosion of the outer surface of production well strings as well as assessing the feasibility of using such protection. The analysis of the features of pipelines and well strings as objects requiring the use of cathodic protection is presented and significant differences in the approaches used in the design of such systems are identified.

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