Experimental study on corrosion behavior of N20 steel by HCO3- concentration in multiple-ions coexisting oilfield produced water

Pengli  Ge; Wenbin  Pang; Zhiming  Liu; Lili  He; Jiang  Meng

doi:10.6180/jase.202504_28(4).0007

Experimental study on corrosion behavior of N20 steel by HCO3- concentration in multiple-ions coexisting oilfield produced water

Chemical Engineering Environmental Engineering

Pengli Ge^1,2, Wenbin Pang^1,2, Zhiming Liu^1,2, Lili He^1,2, and Jiang Meng³This email address is being protected from spambots. You need JavaScript enabled to view it.

¹Northwest Company of China Petroleum and Chemical Corporation, SINOPEC, Urumqi, 830011, China

²Key Laboratory of Enhanced Recovery for Fracture-cave Oil Reservoir, SINOPEC, Urumqi, 830011, China

³School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing, 401331, China

Received: October 23, 2023
Accepted: April 14, 2024
Publication Date: June 9, 2024

Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.6180/jase.202504_28(4).0007

In order to investigate the effect of typical ions in produced water in oil and gas fields on the pipeline corrosion behavior, the corrosion behavior of N20 steel by HCO⁻_³ concentration in the environment with Cl⁻, Ca²⁺, Mg²⁺ and SO²⁻₄ wasstudied bymeansof weight loss measurement and electrochemical tests. The effects of HCO⁻₃ concentration on the corrosion of N20 steel were analyzed by means of optical microscope, scanning electron microscope, energy spectrum analyzer and electrochemical workstation. The results showed that in the range of HCO⁻₃ concentration in this work, the water sample has an obvious trend of CaCO₃ scaling. With the increase of HCO⁻₃ concentration, the corrosion rate of N20 steel first increased and then decreased, and the corrosion control changed from discharge process and diffusion process to diffusion process. When the concentration of HCO⁻₃ is 200 mg/L,theuniform corrosion rate reaches the maximum. Due to the different HCO⁻₃ concentration, the density and distribution of the layers of scaling and corrosion products are different. Therefore, even if large-scale scaling occurs, local corrosion of N20 steel cannot be prevented due to the non-uniformity of scaling.

Keywords: produced water; HCO− 3 concentration; corrosion behavior; N20 steel

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