超酸性油气田水的腐蚀特性及缓蚀剂研究

Study on Corrosive Characteristics and Corrosion Inhibitor of Extra-Acidic Water from Oil and Gas Fields

针对我国特高硫油气田开发过程中可能遇到的回注水系统腐蚀问题、高含Ｈ＿２Ｓ盐水的腐蚀特性，以及应采取的相应防腐措施等进行了论述，推荐了一种缓蚀剂配方。试验结果表明：这种缓蚀剂配方，在模拟条件下，仅用５０ｍｇ／ｌ的剂量就能将污水的腐蚀速率从０．８３１０ｍｍ／ａ降低到０．０７６ｍｍ／ａ以下，且具有抑制或延缓氢渗透和硫化物应力腐蚀破裂发生的能力。

The poper discussed the recirculated water system corrosive problems which might be encountered during the development of oil and gas fields with extra-high H_2S content in our country,the corrosive characteristics of salt water with high H_2S content as well as the corresponding anti-corrosive measures should be taken,and a kind of new corrosion inhibitor formulation was recommended. The experimental results under simulated field conditions showed that only 50 mg/L of the corrosion inhibitor could decrease the corrosion rate of waste water from 0.8310 mm/a down to 0.076 mm/a and below,with an additional ability in inhibiting or retarding the hydrogen penetration and accurrence of sulphide stress corrosion cracking at the same time.