Preprint Article Version 1 This version is not peer-reviewed

Investigations on Corrosion Behaviors of Super-Strength Sucker Rod Steel in High SO42- Environment

Version 1 : Received: 29 October 2017 / Approved: 1 November 2017 / Online: 1 November 2017 (04:15:39 CET)

How to cite: Han, Z.; Huang, X.; Li, Y. Investigations on Corrosion Behaviors of Super-Strength Sucker Rod Steel in High SO42- Environment. Preprints 2017, 2017110001 (doi: 10.20944/preprints201711.0001.v1). Han, Z.; Huang, X.; Li, Y. Investigations on Corrosion Behaviors of Super-Strength Sucker Rod Steel in High SO42- Environment. Preprints 2017, 2017110001 (doi: 10.20944/preprints201711.0001.v1).

Abstract

In some sour reservoirs and tertiary oil recovery blocks, SO42- in solution can cause the corrosion and corrosion fatigue of the sucker rods. In this paper, the corrosion behaviors of super-strength sucker rod FG20 (16Mn2SiCrMoVTiA) steel in the well fluid are investigated by electrochemical measurements, and electron probe micro-analyzer (EPMA) analysis. The results show that FG20 steel has a favorable corrosion resistance in neural solutions. When the hydrogen ion content increases, the hydrolysis of SO42- greatly accelerates the corrosion of FG20 steel. The energy dispersive X-ray(EDX)results demonstrate that the corrosion process of FG20 steel in neural well liquid is an oxygen concentration process, and the protective FeCO3 and Fe2O3 on the surface of the samples can prevent further corrosion. With the increase of the acidity in the well liquid, the corrosion process converts into a sulphide concentration process, and the sloppy FeS and mackinawite film cannot provide effective protection for the specimens, resulting in the increase of corrosion rate.

Subject Areas

corrosion behavior; FG20; electrochemical measurements; EPMA; corrosion mechanism

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