CO_2腐蚀预测及其在井下管柱寿命预测中的应用  

CO2Corrosion Model and IT Application in the Prediction of Column Lifespan in Gas Wells

作　　者：李彦龙[1] 董长银[1] 陈新安[1] 隆佳佳[1] 许拓拓 

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266555

出　　处：《内蒙古石油化工》2014年第7期19-22,共4页Inner Mongolia Petrochemical Industry

摘　　要：腐蚀是影响气井井下管柱寿命的重要因素,正确预测井下管柱的腐蚀速率是提高防腐效果的关键。CO2腐蚀是富CO2气井管柱可靠性寿命的最关键制约因素。笔者通过调研,对目前国内外油气田常用的腐蚀速率预测模型进行了分类和剖析,此基础上提出了气井井下管柱的可靠性使用寿命的预测方法,并建立了相应的模拟程序。通过对比研究发现在低温低压条件下不同预测模型的预测结果相近,但是高温高压条件下的预测结果则相差较大,因此需要根据不同的矿场条件优选相应的腐蚀速率预测模型。将腐蚀速率预测结果与井下管柱的安全使用厚度结合可以有效预测气井井下管柱的可靠性寿命。研究结果对现场生产有一定的指导意义。Correct prediction of corrosion rate is so important by the reason of it critical impact on lifetime of casing and tubing,especially under the wells with high level CO2content.Different kinds of CO2 corrosion rate predictive models were presented and analyzed and a new way to predict column lifespan in gas wells was provided in this paper.It was found that the results predicted by different models is close to each other in case of low-temperature low-pressure conditions but poles apart in case of high-temperature high-pressure conditions.A program package was used to study the predictive results、merit and demerit and application conditions and that supplies a direction to oilfield design.

关 键 词：管柱寿命 CO2腐蚀 腐蚀速率 预测模型 井下管柱 

分 类 号：TE98[石油与天然气工程—石油机械设备]