海底雙層混輸管道內(nèi)管外腐蝕原因與行為研究
[Abstract]:Oil fields are shut down due to submarine pipeline damage, and a large number of pollution incidents in the sea area are increasing day by day. Corrosion is an important cause of submarine pipeline damage. The (SPM) pipeline from B platform to single point mooring system in M oilfield is a double layer pipe, but the corrosion defects of the inner and outer wall of the pipeline are increased from 732 to 4618 in two times of internal detection. In order to provide theoretical basis for the safe operation of submarine pipelines and the prevention of corrosion failure accidents, the causes and behaviors of external corrosion are analyzed. In this paper, the reasons for the corrosion of the inner tube and the outer tube are determined by the internal inspection and the field sample analysis. The mechanical properties and metallographic structure of the welded joint are analyzed by testing the material properties of the welded joint, and the corrosion test of the hanging sheet is carried out. The corrosion law of internal and external corrosion factors and the galvanic corrosion of welded joints were studied by electrochemical corrosion test and micro-area electrochemical corrosion experiment. The residual strength of pipeline and the prediction of residual life are used to judge whether the inner pipe can continue to be in service. The research contents and conclusions of this paper mainly include the following five aspects: (1) through the analysis of the condition of the inner tube, the composition of corrosion products in the field, the corrosion of carbon steel in seawater, the appearance and shape of the insulation layer sample in the field, etc. It is determined that the corrosion of inner tube is caused by weld cracking of outer tube and electrochemical corrosion between seawater and outer wall of inner tube. (2) Radiographic inspection results of welded joint of outer tube show that the welded joint is defective and does not meet SY/T 4103 standard; The tensile test results show that the mean tensile strength of 1-3 welded joints is lower than 490 MPA and does not meet the API Spec 5L standard, while the impact test results show that the average impact energy is more than 50 J, which meets the requirements of engineering acceptance standard. The hardness test results show that the hardness of weld is higher than that of base metal and heat affected zone. The results of slow tensile test show that seawater increases the stress corrosion sensitivity of welded joints of outer tubes. (3) the experimental results show that the corrosion rate of welded joints of outer tubes is higher than that of base metal and heat affected zone. The polarization curve and AC impedance spectrum test and fitting results show that the welding seam has the largest corrosion current density and the smallest capacitance arc diameter, and the galvanic corrosion test results show that the weld-heat-affected zone has the largest galvanic current. The results of scanning Kelvin probe (SKP) test show that there is a galvanic corrosion effect on weld and base metal of welded joint of outer tube, and the weld is accelerated as anode corrosion. (4) the corrosion test results of inner tube hanging sheet show that the corrosion rate increases with the increase of soaking time. The corrosion rate of the sample shows a decreasing trend and the corrosion product film on the surface of the sample is divided into two layers according to the (SEM) results of scanning electron microscope. Electrochemical corrosion experiments show that different factors have different effects on the corrosion law of inner tubes. The corrosion behavior of inner tube X65 steel at different temperatures was obtained by electrochemical corrosion experiments. The results of scanning Kelvin probe test showed that the local corrosion of X65 electrode samples increased with the increase of immersion time within 24 hours. (5) the predicted residual life of pipeline after the first detection was 5.47 years: within the second time. After testing, the pipeline has no residual life. This paper puts forward the maintenance measures to replace the welded joint of outer pipe and the seriously corroded inner pipe.
【學(xué)位授予單位】:西南石油大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TE988.2
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