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Natural gas pipelines are subject to internal corrosion. Internal corrosion of steel pipelines can cause natural gas leakage, leading to wasted energy, explosion hazards, and methane emissions. The U.S. Department of Transport reported numerous case histories of corrosion problems and failures in wet gas pipelines. The National Energy Technology Laboratory (NETL) performed an incident survey from 2010 through 2018 and found that 112 (12%) of these incidents in the U.S. transmission lines were caused by internal corrosion.
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Corrosion and corrosion inhibitor qualification testing has been the subject of many publications over the years, with various guidelines and in-house protocols produced. This has led to a rather large set of test approaches for the qualification of corrosion inhibitors (CIs) for application in oil and gas production facilities.
For challenging conditions, including severe downhole conditions, final testing is often performed via specialized autoclaves or high-pressure flow loops to allow tests to be conducted under conditions as close to those pertaining in the field: T, P, pCO2 and pH2S (or more realistically, fugacity of CO2 and H2S), and as close as can be achieved to the field hydrodynamics.
Over the years there have been several different corrosion modelling software packages developed to provide predicted (estimated) corrosion rates for use in the oil & gas industries. Many are based on the original work of DeWaard & Milliams which provided a best-fit statistical model to corrosion rates measured in flow loop laboratory tests conducted at the IFE (Institutt For Energiteknikk) in Norway ; covering (initially) just partial pressure of CO2, temperature, liquid flow velocity and pH (typically as bicarbonate and dissolved CO2).
It is well known that the hydrodynamics of fluid flow directly influences the corrosion process, as shownin various experiments utilizing rotating electrodes and flow loops to measure corrosion withinturbulent flow. However, when fluid is flowing through a pipe, there is a phenomenon known as the ‘noslipcondition’ which causes the velocity of the fluid to tend to zero as it reaches the wall. For straightpipe flow, this follows the ‘universal law of the wall’ (Figure 1) which separates flow into 3 domains: fullyturbulent flow, the buffer layer, and the viscous sublayer (also known as the boundary layer) which is thebeing modelled here.
HISTORICAL DOCUMENT. THIS RECOMMENDED PRACTICE HAS BEEN WITHDRAWN BY NACE INTERNATIONAL. This NACE standard recommended practice is a guide for selecting corrosion-resistant materials for the supply, storage, pumping, and injection of water encountered in oilfield operations where external or subsea exposure to salt water is not a consideration.
This recommended practice is made available for reference only.
Previous versions:
RP0475-1991
RP0475-1975
Unbonded flexible pipes used for transporting process fluids in offshore oil and gas production systems have a complex structure, with alternate polymer and metallic layers. Tensile armors are metallic layers constructed by the helical wrapping of high strength carbon steel wires, and they are responsible for the integrity of the pipe. These armors provide axial strength and torsion resistance to the pipe so that it can sustain its own weight and resist to stresses associated to environmental conditions and vessel motion.
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.
Pre-salt carbonate reservoirs in the Santos Basin are a challenge for offshore well design andconstruction. Located under a salt layer of around 2000 m, they generate large amounts of carbon dioxide associated with oil and gas production. To avoid releasing millions of cubic meters of CO2 into the atmosphere, the gas is reinjected or used for artificial lift purposes, where its fraction can reach up to 80% of the total composition.
The use of carbon steel pipelines lined or clad with corrosion resistant alloys (CRAs) is increasing in the O&G industry. These pipelines combine the mechanical properties of carbon steel with the corrosion resistance of CRAs. Some CRAs such as AISI 316L (UNS 31603) are not pre-qualified according to ANSI/NACE MR0175/ISO 15156 part 3. The potential for corrosion and cracking of carbon steel in some applications can require a CRA liner/clad layer to resist corrosion but this can introduce the possible risk of stress corrosion cracking of some CRAs.