塔里木油田有机盐完井液腐蚀研究

模拟塔里木油田腐蚀环境考察了有机盐完井液密度、温度、pH值对P110、VM140和HP13Cr三种油管材质的腐蚀行为。结果表明：随完井液密度的增加，管材的腐蚀速率逐渐降低；温度越高腐蚀越严重，随温度逐渐升高，试片由均匀腐蚀变为坑点较多的局部腐蚀；pH值增加，腐蚀速率逐渐下降，这与完井液适宜在偏碱性环境中使用相一致；相同条件下，腐蚀速率大小为P110＞VM140＞HP-13Cr；P110和VM140在低密度完井液中存在严重的局部腐蚀，相同条件下VM140抗局部腐蚀的能力强于P110，但二者的差异不大，HP-13Cr基本无局部腐蚀。当完井液密度低于1.15g/cm³或温度超过80℃时，P110和VM140腐蚀严重，必须采取相应的防腐措施。

STUDY ON ORGANIC SALT COMPLETION FLUID CORROSIVITY IN TARIM OILFIELD

The influence of density of organic salt completion fluid,temperature,pH value and material on corrosion behavior of three types of tubings,which include P110,VM140 and HP-13Cr,is investigated under the condition of simulation corrosion in Tarim Oilfield.The results show that corrosion rate of materials decreases with density of completion fluid increase,coupons corrod more severely and are translated from uniform corrosion to local corrosion with many pits when temperature elevates gradually,corrosion decrease with pH value according with completion fluid adapting to be useed in alkaline environment,proportion of uniform corrosion rate of materials is P110＞VM140＞HP-13Cr in the same environment,P110 and VM140 show severely local corrosion,ability of anti-local corrosion of VM140 exceeds P110,nevertheless,difference of these is unobvious,while no local corrosion occurres to HP-13Cr.Corrosion control measures should be taken when density of completion fluid lows 1.15g/cm³ or temperature exceeds 80℃.