Conditions for carbon dioxide corrosion in oil, gas, and gas-condensate fields are discussed. Corrosion mechanisms in oil, gas, and gas-condensate fields and gas and oil pipelines are compared. Various factors are shown to affect the CO 2 corrosion rate of steel in oil and gas field media.

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The reliability of assessment of the effectiveness of oil-and gas-field equipment protection by inhibitors depends on the method employed. Assessments based on results received by several methods make it possible to Fred a set of inhibitors that are the most effective for each specific fieM and to develop the most optimal technology for their application.In accordance with the established standards [1][2][3], the effectiveness of inhibitors under industrial conditions is assessed as follows:--in gravimetric method: from the loss of the mass of the control samples placed in a stream of the product being recovered;--in electrochemical method: by using a corrosion meter and transducers placed in the pipelines; --in analytical method: from the change of iron ion concentration in the aqueous part of the product being recovered;--from the number of breaches (total and specific) in the pipelines due to corrosion; --from the state of the surface of the metallic equipment being protected and its actual service life. Practically speaking, each of these methods has its limitations, which are often ignored in practice. The gravimetric method is the most popular and is almost always employed for preliminary assessment of inhibitor effectiveness in specific oil-and gas-field environments. Note that this method allows determination of the average rate of uniforha corrosion of the samples over the testing time, and only from the results obtained by this method can we assess the suitability of a particular inhibitor in specific situations.

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