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In any operating facility, the integrity of flare or relief lines should always be closely maintained, as it is one of the most important safeguards during plant upsets or emergency conditions. The most common damage mechanism in acid flare lines is acid gas dew point corrosion”. Corrosion in such systems is often dependent on fluid stagnation, especially in the presence of acidic water, during idle conditions.The intent of this paper is to shed light on the efforts done in a gas treatment facility to identify different root causes that impacted or accelerated Acid Gas Dew Point Corrosion. These included design deficiencies, equipment integrity, and process challenges. Moreover, the paper provides findings and recommendations to avoid the occurrence of similar events in acid flare lines.
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M. B. Kermani pointed out that 25% of equipment failures in the oil and gas industry are caused by corrosion, and more than half of corrosion events are related to produced fluids containing CO2 and H2S. In recent years, the exploitation of sour oil and gas fields (containing H2S or H2S/CO2 mixture) has become more and more common, and prominent problems such as tubing ruptures caused by pitting and uniform corrosion have appeared. In oil fields containing CO2 and H2S, local corrosion is a key factor restricting the selection of tubing and casing materials. In an oilfield containing CO2 and H2S in the Middle East, the authors corroded coupons on site, and carried out indoor simulation experiments for the problems found in the field test. The authors systematically studied 13Cr, S13Cr, 22Cr, 25Cr and 2550 in the presence of H2S, CO2 and high mineralization.
This paper reviews the corrosion management for a critical sour gas pipeline operated by Saudi Aramco. The 38-inch diameter pipeline transports untreated sour gas from Crude Processing Facility (CPF) to downstream Gas Plant and spans a total distance of 145 km. To prevent internal corrosion inside the pipeline, the wet sour gas is dehydrated using Tri-Ethylene Glycol (TEG) unit.
Additively Manufactured Alloy UNS N07718 (AM 718) has been increasingly adopted for components in oilfield applications. AM 718 fabricated using laser powder bed fusion (LPBF) has demonstrated not only excellent mechanical performance, but also promising capabilities in critical services such as sour or hydrogen-generating conditions. In oilfield applications, it is generally felt that AM 718 should comply with API standard 20S4, and align with the requirements for wrought 718 in API 6ACRA.
Mineral scales frequently occur in tanks, pipelines, cooling and heating system, production wells ofoil and gas, external and internal membrane, and other equipment during industrial processes,causing the reduction of process efficacy and millions of dollars on dealing with the scale issues. Asoil and gas are produced increasingly in more unconventional reservoirs, such as deeper and tighterzones, with new technologies, more challenges are encountered to mitigate scale problems.
Sour gases like hydrogen sulfide (H2S) are one of the main risks associated in the production and processing of oil and gas. H2S is a very toxic and pungent gas that causes problems in both the upstream and downstream oil and gas industry. Exposure to H2S, even at relatively low concentration can prove deadly and has many HSE implications.
This is Part I of a two-part series intended to provide background and a rational justification or supporting rationale for requirements leading to the development and publication of NACE(1) MR 0175 and ISO(2) 15156. Part I focuses on some of the metallurgical and processing requirements; specifically, Rockwell C 22 scale (HRC) limit, the various acceptable heat treatments and the 1wt% Ni limit for carbon and low alloy steels to minimize the threat of sulfide stress cracking (SSC) in H2S containing environments. Part II describes the testing and rationale behind the use of accelerated laboratory test procedures and their development to differentiate metallurgical behavior in sour environments.
This paper is Part II of a two-part series intended to narrate the history, some of which has been forgotten over time, leading up to the publication of the first Material Requirement (MR-01-75) standard prepared by NACE and its subsequent auxiliary standards. Previously, Part I1 described the field observations and discussed the metallurgical factors that were being investigated by the historical NACE T-1B and 1F committees to support the development a “harmonized” sour service materials standard. In Part II, we focus on the rationale behind the use of accelerated laboratory test procedures and their development to differentiate metallurgical behavior in sour environments.
The purpose of this review is to discuss environmental effects, especially hydrogen sulfide and carbon dioxide on pitting susceptibility of low alloy steels and corrosion resistant alloys.
Measurement of uniform corrosion resistance in the presence of H2S, through polarization curves, and slip steps height and spacing, through Atomic Force Microscopy technique (AFM) have been performed.
A 2002 study estimated the annual cost associated with corrosion of gas pipelines to be around $5 billion. Corrosion of oil and gas pipelines continues to pose a major issue in the oil and gas industry due to the combination of brine produced with the oil and the type of acid gas present which can lead to significant internal corrosion. Oil and gas reservoirs can be separated into two categories, sweet and sour.