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在实验室模拟新疆油气田复杂地质环境深井下P110套管典型腐蚀工况,通过腐蚀电位测定,极化行为测试和不同极化电位下交流阻抗谱分析,以其揭示腐蚀控制机制,来确定阴极保护参数。结果表明,井下温度升高对于P110套管的腐蚀影响显著,而矿化度及pH值改变对其腐蚀过程影响轻微;所模拟的新疆油气田复杂环境下P110套管的阴极保护最小电位确定为-900～-1100 mV(vs SSE),最大保护电位为-1200～-1400 mV(vs SSE)。
In the laboratory, typical corrosion conditions of P110 casing in deep geological conditions in Xinjiang oil and gas field are simulated. Through the corrosion potential measurement, polarization behavior test and AC impedance spectroscopy analysis under different polarization potentials, the corrosion control mechanism is revealed to determine the cathodic protection parameter. The results show that the downhole temperature has a significant influence on the corrosion of P110 casing while the salinity and pH change have little effect on the corrosion process. The minimum potential of cathodic protection for P110 casing simulated in Xinjiang Oilfield is - 900 ~ -1100 mV (vs SSE), the maximum protection potential of -1200 ~ -1400 mV (vs SSE).