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REMNANT LIFE ESTIMATION OF PIPELINES WITH INTERNAL CORROSION

机译：具有内部腐蚀的管道的剩余寿命估算

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Situations can arise where the condition of a pipeline system is poorly known. This may be due to a variety of operational or commercial reasons. Failures will eventually occur if time dependent degradation mechanisms are active. While an appropriate response may be to inspect or hydrotest, this is generally not feasible within a short time frame and integrity assessments or replacements must therefore be prioritized.rnThis paper looks at an ageing upstream pipeline system subject to internal corrosion. A case study is presented in which a system approaching its original design life is required to carry fluids from reservoirs now forecast to be productive for another 50 years. Fluids include sweet or sour gas, crude oil and injection water. Design data are available but inspection information is sparse with less than 10% of lines inspected by ILI; coupon data and well production forecasts are available. The challenge was to prioritize line replacements according to the remnant life of each pipeline, based on the limited available data.rnCurrent condition was measured for lines where ILI data were available. A corrosion risk assessment was conducted to identify credible degradation mechanisms. The pipelines were then grouped according to the fluids being transported. This enabled an estimate of current condition for all pipelines based upon the limited inspection and coupon data.rnIn order to predict the remnant life it was necessary to estimate the future corrosion rates, again for all lines. A number of approaches could be used for estimating future corrosion rates. These include basing the rates on historical inspection data or using corrosion modeling techniques. The paper describes a hybrid method that synthesises these two approaches to allow a corrosion rate distribution to be postulated for calculating remnant life. In addition, the options for future corrosion rate estimation are described and the advantages and disadvantages of each one discussed.
机译：可能会出现管道系统状况知之甚少的情况。这可能是由于各种操作或商业原因。如果时间相关的降级机制处于活动状态，则最终将发生故障。尽管适当的响应可能是检查或水压测试，但这通常在短时间内是不可行的，因此必须优先进行完整性评估或更换。本文研究了遭受内部腐蚀的上游管道系统。提出了一个案例研究，其中需要一种接近其原始设计寿命的系统来从现在预测可再生产50年的储层中输送流体。流体包括甜酸或酸性气体，原油和注入水。有可用的设计数据，但检查信息很少，ILI检查的管线不到10％；可提供优惠券数据和油井产量预测。面临的挑战是，根据有限的可用数据，根据每条管道的剩余寿命来优先安排管线更换。■测量可获得ILI数据的管线的当前状况。进行了腐蚀风险评估，以确定可靠的降解机理。然后根据所输送的流体对管道进行分组。这样就可以基于有限的检查和试件数据来估计所有管道的当前状况。为了预测剩余寿命，有必要再次估计所有管道的未来腐蚀率。许多方法可用于估计未来的腐蚀速率。其中包括根据历史检查数据或使用腐蚀建模技术得出费率。本文介绍了一种混合方法，该方法综合了这两种方法，可以假定腐蚀速率分布以计算剩余寿命。此外，还介绍了未来腐蚀速率估算的方法，并讨论了每种方法的优缺点。

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