Increasing desulphurisation of the metal of welded joints in oil pipelines

Макаренко, В. Д.; Shatilo, S. P.

doi:10.1080/09507119909452086

Cited by 5 publications

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“…Main and industrial pipelines are the most cost-effective ways of oil and gas transportation in Ukraine. The system of gas and oil pipelines has entered a period of intensive aging and wear as evidenced by the technical condition analysis based on the data of diagnostics and technical examination of these objects [1]. Their resource depends on the characteristics of the material, deteriorating during operation, medium impact, operating conditions and modes, available initial defects and the ones formed during operation, etc.…”

Section: Introductionmentioning

confidence: 99%

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Neural network analysis of safe life of the oil and gas industrial structures

Vynnykov,

Kharchenko,

Manhura

et al. 2024

Min. miner. depos.

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Purpose is to study safe life of industrial (metal) structures under long-time operation in the corrosive-active media of oil and gas wells with the help of neural network analysis. Methods. The MATLAB system (MATrix LABoratory) was selected as the tool environment for interface modelling; the system is developed by Math Works Inc. and is a high-level programming language for technical computations. Of the three existing learning paradigms, we used the “with teacher” learning process, as we believed that a neural network had correct answers (network outputs) for each input example. The coefficients were adjusted so that the network gave answers being as close as possible to the known correct answers. Findings. An artificial neural network has helped obtain a generalized diagram of the expected areas of high viscoplastic characteristics of carbon steels used to manufacture metal structures in the oil and gas industry. While applying the trained neural networks, generalized dependences of the corrosion rates of structural steels on the parameters of media with different concentrations of chlorine ions, sulphate ions, hydrogen sulphide, carbon dioxide, carbon dioxide, and oxygen ions were obtained; they were the basis to predict corrosion behaviour of steels. Originality. For the first time, the possibility of applying neural network modelling to predict local corrosion damage of structural pipe steels has been shown in terms of the “steel 20 – oxygen and chloride-containing medium” system. For the first time, the technological possibility has been demonstrated to use neural network analysis for engineering predictive assessment of corrosion activity of binary systems of simulated solutions, which are most often found under industrial conditions of the oil and gas sector of the economy. Practical implications. The proposed technology of using the neural network analysis will make it possible to expand a range of predicted values beyond experimental data, i.e. to predict the value of Vcor in very dilute or concentrated salt solutions within the acidified and neutral pH ranges. It should be noted that the error of the prediction results shown by the neural network will increase along with distancing from the scope of experimental data.

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Section: Introductionmentioning

confidence: 99%

“…Their resource depends on the characteristics of the material, deteriorating during operation, medium impact, operating conditions and modes, available initial defects and the ones formed during operation, etc. [1], [2].…”

Section: Introductionmentioning

confidence: 99%

Neural network analysis of safe life of the oil and gas industrial structures

Vynnykov,

Kharchenko,

Manhura

et al. 2024

Min. miner. depos.

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“…On the average, rod temperature is 20-22°С. Such a temperature gradient factors into varying graininess of structural components in HAZ as well as into 20% decrease in plastic characteristics and impact strength [6] causing micro stress gradient origination in the HAZ.…”

Section: Introductionmentioning

confidence: 99%

Analysis of corrosion fatigue steel strength of pump rods for oil wells

Vynnykov¹,

Kharchenko²,

Manhura³

et al. 2022

Min. miner. depos.

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Purpose is to perform analysis of corrosion durability (fatigue) of pump rod materials in terms of various chemically active simulation environments, and study influence of economically modified rare-earth impurity on corrosion fatigue strength of pump rod materials. Methods. 40 and 20N2M steel grades have been applied as well as experimental steel (ES). Steel of the conditinal ES grade has been melted within a pilot site of Institute of Electric Welding Named after E.O. Paton of the National Academy of Sciences of Ukraine. The steel was alloyed economically by means of a micro impurity of a rare-earth element (REE) being 0.03% of cerium; in addition, it contained comparatively low concentration of sulfur and phosphorus as well as minor concentration of dissolved hydrogen. The following has been used as simulation environments: 1) NACE environment (i.e. 5% NaCl solution which contained 0.5% СН3СООН, and saturated H2S; t = 22 ± 2°C; pH = 3.8-4.0); 2) 3% NaCl solution without hydrogen sulphide. Once every day, the environment was replaced to oxygenate it up to 8-10 mg/l concentration. Findings. Stability against sulfide stress-corrosion cracking (SSCC), hydrogen initiated cracking (HIC), and corrosion fatigue of steel of deep pump rods for oil industry has been studied. It has been defined that the experimental steel, modified economically by means of micro impurities of a REE, meets NACE MR0175-96 standard in terms of chemical composition as well as strength; in turn, 20N2M and 40 steel grades have high resistance neither to SSCC (threshold stresses are < 0.8 s) nor to corrosion fatigue attack; moreover, steel grade 40 has demonstrated low resistance to HIC (CLR > 6% and CTR > 3%). Originality. It has been identified that corrosion fatigue attack results from hydrogen penetration of steel initiating its cracking and hence destruction under the effect of alternating loads accelerated by the action of corrosive environment. Further, surface micro destructions, influenced by micro stresses, transform into large discontinuities and cracks with following macro destructions. Practical implications. It has been proved that high resistance to corrosion cracking can be achieved by means of refining of pump-rod steel of ferrite and perlite type using metallurgical methods, i.e. 0.01-0.03% REE microalloying.

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“…It is known that the problems of crack resistance and embrittlement of metals, which are exploited in corrosion media with hydrogen sulfide impurities in the fields of oil and gas fields, were dealt with as domestic [8][9][10] (A.G. Gumerov, K.M. Yamaleiev, O.I.…”

Section: Introductionmentioning

confidence: 99%

Study of Corrosion and Mechanical Resistance of Structural Pipe Steels of Long-Term Operation in Hydrogen Sulfur Containing Environments

Макаренко

Manhura

Kharchenko

et al. 2021

MSF

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Analysis of literature sources, as well as practical data indicate that the existing scientific, technical and technological developments to ensure reliable corrosion-mechanical resistance and durability of oil and gas pipelines and other shell metal structures of critical use and subordinate to the State Service for Mining Supervision and Industrial Safety of Ukraine largely find contradictions and uncertainty; there are no quantitatively substantiated recommendations for practical application in order to ensure corrosion and mechanical resistance of pipelines operating in technologically aggressive environments under alternating temperature and barometric conditions and loads; there is a need for a systematic study of the causes, conditions and mechanisms of corrosion and mechanical damage of long-term equipment, which will significantly increase the operational reliability of industrial equipment. Experimental studies have established the causes and substantiated the mechanisms of metal softening with increasing service life (from 0 to 25 years) that leads to its degradation, especially during long-term operation in corrosive environments. A method for forecasting the residual working (accident-free) life of pipeline metal structures has been developed, which makes it possible to purposefully regulate their operational condition. This allows the timely use of technical, design and technological measures to improve the performance of such structures. Numerous and diverse results of experimental tests of metal samples for various purposes have been obtained, which provide an opportunity to create a base for comparative analysis of steels in many parameters of crack resistance, which will become a reliable basis for scientific and practical substantiation of the equivalent replacement of some steel grades with other grades, taking into account technological loads, corrosive environments and others.

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Increasing desulphurisation of the metal of welded joints in oil pipelines

Cited by 5 publications

References 0 publications

Neural network analysis of safe life of the oil and gas industrial structures

Neural network analysis of safe life of the oil and gas industrial structures

Analysis of corrosion fatigue steel strength of pump rods for oil wells

Study of Corrosion and Mechanical Resistance of Structural Pipe Steels of Long-Term Operation in Hydrogen Sulfur Containing Environments

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