Ca2+/HCO-3比值对CO2腐蚀的影响
Influence of Ratio of Ca2+/HCO-3 on CO2 Corrosion
摘 要
研究了20＃钢半浸在65 ℃, 通入0.1 MPa压力的CO2气体, 含两种K值(K=Ca2+/HCO3-)的模拟油气田产出水中, 以及悬挂在该产出水气相中的腐蚀行为。结果表明, 在K值为193(高K值)下的平均腐蚀速率小于在K值为87(低K值)下的平均速率, 而高K值下的局部扩展速率高于低K值下的局部扩展速率, 表明K值是影响CO2腐蚀的重要参数之一。
CO2腐蚀
Ca2+/HCO3-比值
平均腐蚀速率
局部腐蚀速率
20＃ steel
CO2 corrosion
ratio of Ca2+/HCO3-
average corrosion rate
localized corrosion rate
Abstract
The CO2 corrosion behaviors of 20# steel half-immersed in simulated oilfield produced waters were studied. The waters with two K values (K is ratio of Ca2+/HCO3-) were aerated with 0.1 MPa CO2 gas at 65 ℃. The results showed that the average corrosion rate of the samples with K=193 was lower than that with K=87, but the localized corrosion rate of the samples with K=193 was higher than that with K=87, indicating that the K value is one of the key parameters infuencing the CO2 corrosion.
中图分类号 TG172.3
所属栏目 试验研究
基金项目
收稿日期 2010/12/8
修改稿日期 2010/12/31
网络出版日期
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联系人作者杜新燕(dxy8208@163.com)
引用该论文: DU Xin-yan,HUANG Shu-jü,WU Bo,ZHANG Jian-xun. Influence of Ratio of Ca2+/HCO-3 on CO2 Corrosion[J]. Corrosion & Protection, 2011, 32(8): 634
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参考文献
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【3】宋庆伟, 黄雪松, 岳淑娟, 等. 中原油田集输管线多相流腐蚀预测模型[J]. 钻采工艺, 32(4):130.
【4】王献昉, 陈长风, 白真权, 等. CO2腐蚀速率半经验预测模型研究[J]. 腐蚀与防护, 2009, 30(2):90-94.
【5】Crolet J L, Bonis M R. Prediction of the risk of CO2 corrosion in oil and gas wells SPE production engineering[C]//1991:449-453.
【6】姚晓. CO2对油气井管材腐蚀的预测与防护[J]. 石油钻采工艺, 1998, 20(3):44-49.
【7】王选奎, 洪霞. 户部寨气田腐蚀规律研究[J]. 断块油气田, 2005, 12(1):77-80.
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