The study of protective properties of corrosion inhibitor Napor-1012 head in a high content of iron sulfide in oilfield environments

Nadezhda S. Buldakova JSC Izhevsk Oil Research Center Izhevsk, Russian Federation NSBuldakova@udmurtneft.ru
Olga A. Ovechkina JSC Izhevsk Oil Research Center Izhevsk, Russian Federation OAOvechkina@udmurtneft.ru
Julia V. Beresneva JSC Izhevsk Oil Research Center Izhevsk, Russian Federation YVBeresneva@udmurtneft.ru
Veronika K. Miller JSC Izhevsk Oil Research Center Izhevsk, Russian Federation VKMiller@udmurtneft.ru
Nadezhda V. Novikova JSC Izhevsk Oil Research Center Izhevsk, Russian Federation NVNovikova@udmurtneft.ru
In the context of the corrosiveness of the fluid produced in the oil fields of "Udmurtneft" noted an increased number of failures downhole equipment on the productive fund. One of reason for reducing the effectiveness of corrosion inhibitors is the presence of iron sulfide in produced water. The article discusses the possible impact of the presence of FexSy on protection of water-soluble inhibitor of the brand Napor-1012. It is found that regardless of the type of formation water the of appearance the iron sulfide in system is accompanied by a significant increase of the corrosion rate of the metal, which is explained not only by the formation of galvanic couples between the precipitate and the metal surface of the equipment, but also the partial adsorption of reagent on surface of dispersed sulfide particle. In this work was determined the specific dosage of corrosion inhibitor for the treatment model four fields with different content of iron sulfide.
Materials and methods
Gravimetric method for determining the protective action of corrosion inhibitors.
Results
The study to determine the protective properties of the corrosion inhibitor Napor-1012 pressure in oilfield environments containing iron sulphide was conducted. Also the aim of that study was established the effect of adsorption on the surface of the dispersed reagent sulfide particles.
onclusions
1. Corrosion activity of reservoir fluid is dependent not only on the ionic composition of the briny water, the amount of dissolved corrosion activity gases, environments bio-contamination by sulfate reducing bacteria, but also on the content of iron sulfide.
2. The presence of iron sulfide in the producedfluid exacerbates corrosion processes. It's should be taken into account in the selection of corrosion inhibitors designed to protect downhole equipment and pipelines.
3. Corrosion inhibitor Napor-1012 is adsorbed on the surface of the iron sulphide, which leads an increase in the reagent dosages required for effective protection of oil field equipment.
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complications for oil corrosion corrosion inhibitor iron sulfide adsorption