塔河油田地面集输管网碳钢管线材质实验研究

Experimental Study on the Carbon Steel Pipeline of the Surface Gathering and Transportation Network in Tahe Oilfield

塔河油田恶劣的腐蚀环境对地面集输管网碳钢管材的选用提出了更高的要求,现场服役管线失效分析表明,内腐蚀失效形式主要为腐蚀穿孔和沟槽腐蚀,硫酸盐还原菌(SRB)是造成管线失效的原因之一。选择塔河油田地面集输管网在用典型碳钢管材为研究对象,采用CORTEST高温高压反应釜模拟塔河油田典型工况条件并进行全浸腐蚀实验。实验结果表明:P、S、Mn等杂质元素恶化了管材的耐腐蚀性能;碳钢管线在SRB腐蚀环境下极易发生点蚀。因此,在塔河油田典型腐蚀环境下,地面集输管网应选用P、S、Mn等杂质元素含量低的碳钢管材;建议选用含铜抗菌碳钢来抑制细菌腐蚀,但含铜抗菌碳钢在塔河腐蚀环境下的适用性需做进一步研究。

The corrosion environment in Tahe Oilfield is adverse, which puts forward higher requirements for the carbon steel pipe selection of the surface gathering and transportation pipeline network. The failure analysis of field service pipelines shows that the internal corrosion failure patterns are mainly corrosion perforation and groove corrosion, and the sulfate reducing bacterial （SRB） is one of the causes for pipeline failure. The typical carbon steel pipe using in Tahe Oilfield surface gathering and transportation pipeline network is selected to be the studying object. Full immersion corrosion test is carried out by using COILTEST high temperature and high pressure reactor to simulate the typical working conditions of Tahe Oilfield. Experimental results show that the elements P, S, Mn and other impurity elements deteriorate the corrosion resistance of＂ the carbon steel pipeline, and the carbon steel pipeline is extremely prone to pitting corrosion in SRB corrosive environment. Therefore, under the typical corrosion environment of Tahe Oilfield, the carbon steel pipe with low content of-P, S, Mn and other impurity elements should be selected; the copper containing antibacterial carbon steel is suggested to be chosen to inhibit the corrosion of bacteria. However, the applicability of the copper containing antibacterial carbon steel in the corrosion environment of Tahe Oilfield needs to be further studied.