Abstract:

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℃.

Key words: completion fluid, organic salt, Tarim Oilfield, corrosion