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In this paper, we will present a study that is aimed at understanding the relative rates of reactions between oxidizers and bacteria, iron sulfide, H2S, other oxidizable compounds present in produced waters and the overall impact on metal corrosion.
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This paper discusses a study wherein the SSC resistance of 13Cr bar stock quenched and tempered to 22 HRC maximum hardness was tested and evaluated beyond the maximum H2S limit of 10 kPa (1.5 psi) established in NACE MR0175/ISO 15156-3 for use in sour service.
In the current study, mild steel specimens (API 5L X65) were exposed to a 1 wt% NaCl solution sparged at 0.096 MPa pCO2 and 15 ×10-6 MPa or less pH2S (≤ 150 ppm H2S/CO2).
Pitting corrosion of these steels in a high-temperature, high-CO2, low-H2S, and high-Cl- environment was investigated by scanning electron microscope (SEM), energy dispersive detector (EDS) and X-ray diffraction (XRD).
An improved sour corrosion model was developed based on: • A bare steel sour electrochemical corrosion model, derived from published literature • Mechanisms that affect scale performance and trigger localised corrosion • A specific elemental sulphur degradation mechanism • Corrosion mitigation strategy
The susceptibility of Stress Corrosion Cracking (SCC) assisted by H2S according temperature and pH. In a second phase, links are highlighted between the differences of cracking resistance and localized corrosion morphologies.
Black tar-like fouling material was driving frequent shut-downs of a gas plant. Analysis indicated that the nitrogen containing corrosion inhibitor (CI) polymerized with sulfur compounds in a vulcanization process. Testing confirmed the role of the CI in creating this fouling.
It is well known that H2S promotes hydrogen entry into steels that may result in many types of steel failures. This paper examines the influence of traces of oxygen on corrosion and hydrogen charging of steel in an H2S containing environment.
13Cr Super Martensitic Stainless Steel (SMSS) is commonly used in the Oil & Gas industry. The present work has been aimed at evaluating the influence of different heat treatment processes on the corrosion resistance of 110 ksi 13Cr SMSS.
The corrosion behaviour of X65 steel in a mixed 1% H2S (in CO2) brine after exposure to a pure CO2-saturated brine at 40°C. The objective was to identify the scales formed and understand their effect on the corrosion performance of X65 steel upon transition from pure sweet to sour conditions.
A comprehensive parametric study was performed using a small-scale laboratory setup with the aim of investigating the occurrence of localized corrosion of mild steel in marginally sour environments.
A 3-week corrosion testing of UNS N06625 was conducted in supercritical fluid at 350°C and 10 bars to simulate a geothermal environment where other alloys had been tested. Some localized corrosion occurred at a rate similar to previous results.