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Oil field operating company’s (1) flowline network in North and West Kuwait (NWK) has over 3000 wells connected through 6” carbon steel pipelines flowing from wellhead to the nearest Gathering Center (GC). Untreated wet crude is transported through the flowlines to GC’s directly or passing through the Remote Headers and Manifold (RHM) to GCs. In RHM, mixing of the wet crude takes place before it is sent to GC’s via transfer lines for further separation. The flowlines are laid aboveground except at road crossings where they are buried.
In the oil and gas industry, producing flowlines are subject to various corrosion issues due to the presence of various corrosive elements present in the produced fluids. Dissolved CO2 is an important corrosive element as it causes severe localized corrosion of carbon steel lines. In addition, Microbiologically Induced Corrosion (MIC), which is the impact of microbial presence on internal corrosion can also affect integrity of carbon steel material. In oil and gas industry bacteria can be introduced into surface production facilities during the crude washing process as part of the desalting process. Similarly, secondary recovery by water injection can contaminate the produced fluids typically with Sulfate Reducing Bacteria (SRB). The sudden change in H2S levels in the produced fluids can be one of the indications of such SRB contamination. Under low flow conditions, bacteria can rapidly proliferate and cause MIC on the carbon steel flowlines/pipelines. The localized corrosion by CO2 may get aggravated by MIC due to presence of bacteria. Such observations of flowlines will be discussed here.
Scale and corrosion inhibitors are commonly used in many oil and gas production systems to prevent inorganic deposition and to protect asset integrity. Scale inhibitor products are based on organic compounds with phosphate or carboxylic functional groups such as amino phosphonates, phosphate esters, phosphino polymers, polycarboxylate and polysulfonates,1 as shown in Figure 1. These anionic groups have strong affinity to alkaline earth cations and can adsorb on the active growth sites of scale crystal (Figure 2), resulting in stopping or delaying the scale formation process.
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Caustic corrosion is sometimes referred to as “caustic attack or “caustic gouging.” Corrosion of this type may result from internally fouled heat transfer surfaces and the presence of sodium hydroxide in the boiler water; and concentrated solutions of alkali where the normal washing of the tube metal ID is restricted after Departure from Nucleate Boiling (DNB), i.e., when the steam bubble release exceeds the rinsing rate.
In the mid-1990s, the US Navy’s technical community, led by Naval Sea Systems Command (NAVSEA), recognized existing coatings used to protect the inside of ships’ tanks were failing on average 5-8 years after application. The high cost to blast and recoat over 11,000 tanks every 5-8 years, not counting submarines and aircraft carriers, was prohibitive. To address this issue, the Navy conducted a study to analyze the problem and decided to replace these legacy coatings with high solid epoxy coatings.1