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首页> 外文期刊>ISIJ international >Corrosion Behavior Under Black Deposit On Low Cr Bearing Steels In Nacl Completion Fluid
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Corrosion Behavior Under Black Deposit On Low Cr Bearing Steels In Nacl Completion Fluid

机译：低铬轴承钢在Nacl完井液中黑色沉积物的腐蚀行为

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3% Cr steel has been developed as a tubing material for CO_2 oil well considering CO_2 corrosion resistance. However, an oil leakage problem occurred 6 months after the start of oil production in a CO_2 oil well which was completed by tubing of 3% Cr steel. 3% Cr steel was exposed to an alkaline NaCI completion fluid environment before exposed to the oil production environment. Corrosion under the black deposit, which developed locally on 3% Cr steel in the NaCI completion fluid, was identified to be a cause of oil leakage. The conditions of the black deposit formation on 1 % Cr and 3 % Cr steels were investigated by immersion test in a simulated NaCI completion fluid varying dissolved oxygen (DO) concentration, pH and temperature. 1 % Cr steel is a representative Cr bearing steel and used as a comparable material. If the fluid was alkaline and DO concentration was above 77ppb, the black deposit formed locally on 1 % Cr and 3% Cr steels. Localized corrosion was observed just under the black deposit. If the DO concentration was equal to or less than 33ppb, the black deposit did not form. Corrosion behavior of the specimens with the black deposit was also investigated in a simulated oil production environment. It is concluded that corrosion progress under the black deposit on 3% Cr steel in the production environment resulted in the oil leakage 6 months after the start of production. The black deposit was identified as Fe_3O_4 mainly by X-ray diffraction analysis. In order to prevent oil leakage on 3 % Cr steels in the oil production environment, it is necessary to control the DO concentration in the alkaline NaCI completion fluid to or below 33 ppb that prevents formation of the black deposit.
机译：考虑到CO_2的耐腐蚀性，已开发出3％Cr钢作为CO_2油井的管道材料。但是，在CO_2油井中开始采油后6个月出现了漏油问题，该井通过用3％Cr钢制成的油管完成。在暴露于石油生产环境之前，将3％Cr钢暴露于碱性NaCl完井液环境中。发现黑色沉淀物下方的腐蚀是在NaCl完井液中3％Cr钢上局部产生的腐蚀，是造成漏油的原因。通过在改变溶解氧（DO）浓度，pH和温度的模拟NaCl完井液中进行浸没试验，研究了在1％Cr和3％Cr钢上形成黑色沉积物的条件。 1％Cr钢是代表性的Cr轴承钢，并用作可比较的材料。如果流体是碱性的并且DO浓度高于77ppb，则黑色沉积物会在1％Cr和3％Cr钢上局部形成。刚好在黑色沉积物下方观察到局部腐蚀。如果DO浓度等于或小于33ppb，则不会形成黑色沉积物。在模拟的采油环境中，还研究了带有黑色沉积物的样品的腐蚀行为。结论是，在生产环境中3％Cr钢上的黑色沉积物在黑色沉积物下的腐蚀进展导致开始生产后6个月漏油。黑色沉积物主要通过X射线衍射分析鉴定为Fe_3O_4。为了防止在采油环境中3％Cr钢上漏油，必须将碱性NaCl完井液中的DO浓度控制在33 ppb或以下，以防止形成黑色沉积物。

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