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首页> 外文期刊>Corrosion Engineering, Science and Technology >Investigation of pH(2)S influence on 3% Cr tubing steel corrosion behaviours in CO2-H2S-Cl- environment
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Investigation of pH(2)S influence on 3% Cr tubing steel corrosion behaviours in CO2-H2S-Cl- environment

机译：pH（2）S对CO2-H2S-Cl-环境中3％Cr钢管腐蚀行为的影响研究

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A series of experiments were conducted in autoclave to investigate corrosion properties of low Cr oil country tubular goods in CO2/H2S saturated brine solution (3 wt-% NaCl) at 90 degrees C. Test material is 3Cr-80, which is gradually accepted in oil and gas industry, especially for downhole tubing and casing. The CO2 partial pressure was fixed at 4.0 bar in all experiments, and the H2S partial pressure was varied from 0, 2, 4, 8, 20, 40 and 800 mbar to 4000 mbar (4 bar). The results show that when the pH(2)S varied at a lower range (2-40 mbar), 3Cr-80 materials' corrosion rates were restricted, and coupons' surface morphologies became glossy compared to the pure CO2 corrosion. Under the condition of pH(2)S=800 mbar, H2S no longer have a retardation effect on CO2 corrosion but acceleration. The average corrosion rate was higher than pure CO2 corrosion. When the pH(2)S rise to 4000 mbar (equal to the CO2 partial pressure), 3Cr corroded much more severe and serious mesa attack was observed.
机译：在高压釜中进行了一系列实验，研究了低铬油管材在90°C的CO2 / H2S饱和盐水溶液（3 wt％NaCl）中的腐蚀性能。试验材料为3Cr-80，并逐渐在Cr中被接受。石油和天然气工业，尤其是井下油管和套管。在所有实验中，CO2分压均固定为4.0 bar，H2S分压从0、2、4、8、20、40和800 mbar变化至4000 mbar（4 bar）。结果表明，当pH（2）S在较低范围（2-40 mbar）内变化时，与纯CO2腐蚀相比，3Cr-80材料的腐蚀速率受到限制，并且试样的表面形态变得光滑。在pH（2）S = 800 mbar的条件下，H2S不再对CO2腐蚀产生阻滞作用，而具有加速作用。平均腐蚀速率高于纯CO2腐蚀。当pH（2）S升高至4000 mbar（等于CO2分压）时，3Cr腐蚀更加严重，并且观察到严重的台面攻击。

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