开发高镁合金成分,制造用于石油工业的临时密封件

A. Rakoch, N. A. Predein, A. A. Gladkova, A. Koltygin, V. V. Vorozhtsova
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引用次数: 2

摘要

研究人员开发了合金成分,并选择了热处理条件,以获得一种强溶解镁合金,用于油井预调试条件下的球塞,即在短时间内(最多11小时)密封各个井段,进一步几乎完全破坏这些桥塞。研究发现,与高强度ML6相似成分的镁合金的高溶解率的原因是镍含量较高(高达0.19%)。这种元素的化合物沿晶界分布,在含氯离子的介质中导致合金的强烈晶间腐蚀。结果表明,在含110 g/l商用水玻璃的水溶液中,通过等离子体电解(PET)在镁合金表面合成不同厚度的涂层是控制镁合金溶解速度的有效方法。该方法可以在较短的时间内(10 ~ 20 min)以较低的交流电流密度(4 a /dm2)在实验镁合金上合成厚度为10 ~ 41 μm的涂层,镍浓度增加(~ 0,19 %)。腐蚀研究在93±2°C的3% KCl水溶液中进行。利用电容单元在镁合金表面制备了PET涂层。油井密封球塞材料的腐蚀试验条件与国外研究相似。
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Development of high-magnesium alloy composition to create a temporary seals used in oil industry
Alloy composition was developed and heat treatment conditions were selected to obtain an intensively dissolving magnesium alloy to be used as a ball plug under oil-well precommissioning conditions, i.e. to seal various well sections with further near-complete destruction of these plugs for a short time (up to 11 h). It was found that the reason of high dissolution rate of Mg alloy with a composition similar to high-strength ML6 is a higher nickel content (up to 0,19 %). The compounds of this element are located along the grain boundaries, and it leads to intense intercrystalline corrosion of the alloy in a medium containing chlorine ions. It is shown that an effective method for controlling the Mg alloy dissolution rate is to synthesize coatings on its surface with various thicknesses by plasma electrolytic treatment (PET) in aqueous solution containing 110 g/l of commercial water glass. This method allowed synthesizing coatings with a thickness from 10 to 41 μm on the experimental magnesium alloy with increased nickel concentrations (~ 0,19 %) in a short period of time (from 10 to 20 min) with low set AC current density (4 A/dm2) – galvanostatic mode of PET processes. Corrosion investigations were carried out in 3 % KCl aqueous solution at 93 ± 2 °C. PET coatings were obtained on the magnesium alloy using a capacitive unit. Corrosion tests conditions for materials used as ball plugs in oil well seals were similar to that cited in foreign researches.
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