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High performance protective coatings are often failing in the severe headspace environments of wastewater environments. These failures are attributed to many factors including glow permeability properties to resist H2S and other corrosive gasses present within these environments. Although the chemical and physical properties of coating systems can be determined in the lab, this is not the case for application variables and the effects of environmental factors.
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Methodology to simulate actual oil and gas field condition in laboratory tests. A sulfide stress cracking test is carried out on 13% Cr stainless steel with various buffer solutions. Then, pH behavior was estimated. A suitable composition of the solution is proposed by using thermodynamic calculations.
The stainless steel 17-4 PH (H1150D) is a cost-effective alloy for oilfield components due to its combination of high strength, toughness, and good corrosion resistance. Plasma nitriding improves the surface strength of the 17-4 PH and this work suggests that the nitrided can the resistance to SSC.
The decomposition process of ancient marine species in the seabed for millions of years coupled with the presence of specific geological conditions such as high pressures and temperatures led to the formation of what is known today as fossil fuels. For this reason, they can be found either on the earth's surface where ancient seas were located or beneath the seabed. Considering that the ocean covers three-quarters of the Earth's surface the offshore oil and natural gas exploration entail an enormous economic and strategic benefit.1
The formation of greigite and/or pyrite seems to correlate with onset of localized corrosion Experiments involving deposition of pyrite on the steel surface were conducted to investigate if localized corrosion occurs when pyrite is deposited on mild steel in an aqueous H2S environment.
This standard establishes a slow strain rate (SSR) test method for screening corrosion-resistant alloys (CRAs) (i.e., stainless steels and nickel-based alloys) for resistance to stress corrosion cracking (SCC) at elevated temperatures in sour oilfield production environments. The SSR test, which is relatively short in duration, incorporates a slow, dynamic strain applied at a constant extension rate. This results in acceleration of the initiation of cracking in susceptible materials, thereby simulating rather severe conditions.
The standard specifies reagents, test specimen, test equipment, determination of baseline material properties, environmental and mechanical test conditions, test procedure, and analysis and reporting of test results. It is intended for use by laboratory investigators for screening CRAs for resistance to SCC in sour oilfield service.
This revision extends the scope of the standard to address the screening of precipitation-hardened nickel-based alloys for resistance to hydrogen induced stress cracking (HISC) using the SSR test method.
Evaluating elastomeric materials for use in sour liquid environments. Accelerated aging procedure. Hyperbarics. For testing O-rings or elastomeric vulcanizates cut from standard sheets.