Corrosion Behavior of P110 Steel in Vapor-Liquid Phase of H2S/CO2 Coexistence System

QUAN Qing, ZHANG Yuan, LEI Ming, XIA Yang, LIU Wanying

doi:10.16577/j.issn.1001-1560.2024.0101

Materials Protection >

2024 , Vol. 57 >Issue 5: 50 - 60

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0101

Corrosion Behavior of P110 Steel in Vapor-Liquid Phase of H₂S/CO₂ Coexistence System

Expand

(1. School of Petroleum Engineering，Xi’an Shiyou University，Xi’an 710065，China；2. Branch No. 6 Gas Production Plant，Changqing Oilfield，Xi’an 710021，China；3. School of New Energy and Materials，Southwest Petroleum University，Chengdu 610500，China)

LIU Wanying (1983-)，Ph.D.，Associate Professor，Research Focus: Material Corrosion and Protection，Wellbore Integrity and Safety，Nanomaterials and Nanotechnology，Tel.: 028-83037420，E-mail: liuwanyingxx@ 163.com

Received date: 2023-09-19

Revised date: 2023-11-12

Accepted date: 2023-11-20

Online published: 2024-05-31

Supported by

The Natural Science Basic Research Plan of Shaanxi Province (No.2023-JC-QN-0467)；Young Talent Fund of Xi’an Association for Science and Technology (959202313079)

Fold

Abstract

For studying the corrosion behavior and mechanism of tubing in high temperature and pressure vapor-liquid phase of H₂S/CO₂ coexistence system, the dynamic corrosion simulation experiment of P110 steel for oil casing in CO₂/H₂S coexisting system was carried out using the high temperature autoclave. The uniform corrosion rates and pitting corrosion rates of samples were calculated by the weight loss method, and the corrosion behavior characteristics of P110 steel in liquid phase and gas phase of CO₂/H₂S coexistence system were analyzed and studied by XRD, SEM/EDS and 3D optical profile microscope. Results showed that the uniform corrosion rate and pitting corrosion rate of P110 steel in the liquid phase environment were 0.026 3 and 0.208 1 mm/a, respectively, which were higher than the uniform corrosion rate(0.014 8 mm/a) and pitting corrosion rate(0.156 9 mm/a) of P110 steel in the gas phase environment. Moreover, the corrosion products formed on the surface of P110 steel in the liquid phase environment were mainly red-brown powdery loose FeCO₃, and the corrosion products formed on the surface of P110 steel in the gas phase were mainly FeCO₃ and black-brown dense and uniform FeS. FeS inhibited the further corrosion of the base material from corrosive medium of CO₂, H₂S and Cl. Besides, the corrosion of P110 steel in liquid and gas phases was mainly uniform corrosion, with localized pitting and a tendency towards localized corrosion.

Key words： H₂S/CO₂; gas phase; liquid phase; P110; corrosion

Cite this article

QUAN Qing, ZHANG Yuan, LEI Ming, XIA Yang, LIU Wanying . Corrosion Behavior of P110 Steel in Vapor-Liquid Phase of H₂S/CO₂ Coexistence System[J]. Materials Protection, 2024 , 57(5) : 50 -60 . DOI: 10.16577/j.issn.1001-1560.2024.0101

Options

Outlines

模态框（Modal）标题

Abstract

Cite this article