Selection of effective corrosion inhibitors for bischofite solutions and simulated medium of formation waters

National University “Yuri Kondratyuk Poltava Polytechnic”, Department of Oil and Gas Engineering and Technology, 24 Pershotravneva Ave., Poltava, 36011, Ukraine

^* Corresponding author: dmytr.v@gmail.com

Abstract

Questions of the corrosion inhibitors selection for protection of oil-field pipelines have been studied in the article. Results of research of technological and anticorrosive properties of the corrosion inhibitors in mediums simulating industrial environments are presented. The methodological approaches to selection of the corrosion inhibitors on a stage of laboratory experiments on an example of Kaverdinsky gas-condensate deposites have been described. It was found that all the surfactants tested in the simulated medium of the formation waters show a protective effect of more than 90% with a dosage of 1 g/dm³. It is recommended to use bischofite solution with a mass fraction of 24% MgCl₂ and corrosion inhibiting 0.1% КI-1M admixture to protect industrial gas pipelines from carbon dioxide corrosion. This composition provides a degree of corrosion protection to 99.6%. The results of industrial tests confirmed the effectiveness of complex system – bischofite solution with a mass fraction of 24 % MgCl₂ and addition of 0.1% KI-1M corrosion inhibitor. The cationic surfactants KI-1M, St, SRK and amphoteric surfactants EM and KAPB effectively protect in simulating medium and provide a degree of protection from carbon dioxide corrosion to 91.2-98.9%.