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For development of further high-strength low-alloy steel OCTG for sour service, effects of carbon content on the strength, microstructure, and sulfide stress cracking (SSC) resistance of low-alloy steel were fundamentally investigated.
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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.
High voltage direct current (HVDC) transmission results in a large direct current will into the earth. This may cause interference on a buried pipeline even though it is far from the earth electrode. In this work, numerical simulation was used to study the mechanism and influencing factors of HVDC interference.
Over 30 percent of the 607,000 bridges in the FHWA National Bridge Inventory have steel superstructures. Most of those are protected from corrosion damage by thin film coatings or paints. Those coatings have a finite life in relation to the steel they protect. Over time, they degrade, eventually requiring repair or replacement. When selecting this type of superstructure for a bridge, the operating agency incurs an obligation to maintain the coating on the steel to protect it from corrosion to obtain its full service life.
NACE TM0177 Method D corrosion test is used on low alloyed steels in sour environments. A DCB testing program has been performed on 125 ksi grade sour service casings and couplings in 0.07 bar H2S gas for solving these issues and for providing meaningful KISSC values.
The corrosion behaviors of pure titanium UNS R50250 and UNS R50400 were investigated and compared with electrochemical behavior of Ti-0.2Pd and Ti-0.3Mo-0.8Ni alloys (UNS R52400 and UNS R53400 respectively).
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.
Experimental work has demonstrated that novel combinations of the preservative 1,3-Dimethylol-5,5-dimethylhydantoin and tetrakis hydroxymethyl phosphonium sulfate (THPS).can provide synergistic biocidal performance against commonly found oilfield bacteria.
A system approach for cost-effective corrosion controls by incorporating corrosion management into a company’s existing systems. It will improve communication, resourcing, and funding allocation such that corrosion control investments result in positive returns while minimizing costly failures.
X-ray fluorescence microscopy (XFM) maps of corrosion products removed from corroded fasteners that had been in contact with preservative treated wood clearly show the presence of copper and confirm the mechanism of corrosion in treated wood.
Downhole injection of corrosion inhibitors in more mature fields is required to manage scale formation and corrosion within the wellbore completion components. Discussed herein are the physical properties of chemicals injected via capillaries should possess.
In this work, a specially made sample holder that can be fitted inside regular autoclaves was used for simulating sour TLC in the presence of methanol. The experiments showed that for 10 bar H2S + 10 bar CO2, the TLC mass loss rate was 0.2-0.3 mm/y of general corrosion without localized attacks.