P110油管钢在添加元素硫的CO2模拟油田地层水溶液中的腐蚀行为研究

Corrosion Behavior of P110 Tubing Steel in the CO2-saturated Simulated Oilfield Formation Water with Element Sulfur Addition

摘要:

随着油气需求的不断增长，促进了高酸性气田的不断开发，由于元素硫、CO2，以及地层水等腐蚀因素的耦合作用，给油气田生产带来了很大的腐蚀风险。在本工作中，通过浸泡试验和电化学测量研究了P110油管钢在含有元素硫和二氧化碳的模拟油田地层水中的腐蚀行为。结果表明，P110钢的腐蚀速率随着温度增加而增大，温度升高促进了硫化铁的形成，并且引起了严重的点腐蚀。然而， 不同温度范围内温度变化对腐蚀的影响主要归因于不同的腐蚀控制物质，如低温下的二氧化碳和高温下的元素硫。基于该结果，讨论了元素硫和二氧化碳的耦合效应。

Abstract:

With continuously growing oil and gas demand, exploitation of highly sour reservoirs brings large corrosion risks due to the coupling effects of corrosive factors including elemental sulfur, CO2, and formation water. In the present work, corrosion behavior of P110 tubing steel in simulated oilfield formation water containing elemental sulfur and CO2 was investigated by immersion tests and electrochemical measurements. The results indicated that increasing temperature accelerated the corrosion rate of P110 tubing steel, promoted the formation of iron sulfide, and caused serious pitting corrosion. However, influence of temperature varied at different temperature range mainly due to the different corrosion-controlling species like CO2 at low temperatures and elemental sulfur at high temperatures. Based on the results, the coupling effects of elemental sulfur and carbon dioxide were discussed.