CO_2驱油田注采井油套管腐蚀速率控制值  

Control Value of Corrosion Rate for Tubing and Casing of Injection-production Well in CO_2 Flooding Oilfield

作　　者：王世杰[1] 

机构地区：[1]中石化胜利油田分公司采油工艺研究院,东营257000

出　　处：《腐蚀与防护》2015年第3期218-220,280,共4页Corrosion & Protection

基　　金：国家科技支撑计划(2012BAC24B03)

摘　　要：腐蚀控制是CO2驱的关键技术,国内外CO2驱油田普遍采用普通碳钢(J-55、N-80等)油套管通过添加缓蚀剂的措施来控制腐蚀。国内普遍采用0.076mm/a作为腐蚀速率控制值,而国外则没有统一的标准。0.076mm/a来自于标准《碎屑岩油藏注水水质推荐指标及分析方法》,从测试环境、腐蚀源和腐蚀环境来看,直接把它作为CO2驱油田腐蚀环境条件下的选材与腐蚀控制衡量指标是不合理的。通过最危险工况条件下油套管的强度计算所获得的寿命周期内允许的平均腐蚀速率可以作为发生均匀腐蚀材料的选材依据。没有必要设定一个平均腐蚀速率标准值来作为CO2驱油田腐蚀环境条件下优选和评价缓蚀剂的衡量指标。Corrosion control is the key technology of CO2 drive, the measure of adding some corrosion inhibitor into the tubing and casing of ordinary carbon steels （J-55, N-80, etc. ） was used to control CO2 corrosion in tubing and casing for CO2 drive oilfield. 0. 076 mm/a is taken as the control value of corrosion rate in China according to the standard named as “Recommended Index and Analysis Method of Water Quality Injected in Clastic Rock Reservoirs”. And there is no unified standard abroad. From the point of view about test environment, corrosion source and corrosion environment, using 0. 076 mm/a as the control value of corrosion rate for material selection is unreasonable. Under the most dangerous conditions, the average corrosion rate allowed during life cycle calculated by the strength of tubing and casing is reasonable for material selection. There is no need to set an average standard corrosion rate for corrosive environment in CO2 drive oil field as measurement index for optimization and evaluation of corrosion inhibitors.

关 键 词：CO2腐蚀 腐蚀速率 缓蚀剂 

分 类 号：TG172.9[金属学及工艺—金属表面处理]