Corrosion mechanism and corrosion control of slotted liners

石油和天然气工业是加拿大西部重要的经济支柱。在影响高效采油的众多技术和经济因素中，腐蚀问题长期以来一直是加拿大石油工业面临的一大挑战，尤其是在阿尔伯塔。石油开采过程中的极强腐蚀性物质造成了恶劣的使用条件，并且腐蚀损坏显著缩短了设备部件（例如蒸汽辅助重力泄油（SAGD）系统中的割缝衬管）的寿命，导致生产成本高、生产效率低、安全和环境问题。修理/更换损坏割缝衬管的费用很高，对作业的技术和财务方面造成双重影响。因此，有必要系统地研究割缝衬管的失效机理和影响材料降解的因素。深入了解潜在的控制因素将使我们有效地解决腐蚀问题。该研究旨在提高割缝衬管用碳钢的耐腐蚀性。这可以通过研究腐蚀机制和不同割缝工艺对腐蚀和堵塞行为的影响来实现，然后开发耐腐蚀和堵塞的涂层，技术上简单，能够延长割缝衬管的使用寿命。拟议研究的成果将为阿尔伯塔和加拿大石油工业提供直接的经济效益。更具体地说，新的材料选择技术标准，更好的槽制造工艺和有效涂层的开发将为RGL提供一套实用的设计标准，以优化其SAGD系统的运行性能并延长设备的使用寿命。该项目还将为培训HQP提供极好的机会，他们将成为RGL或该国其他地方石油公司的宝贵工作人员。毫无疑问，知识型劳动力将大大加强加拿大的全球竞争力。

The oil and gas industry is an important economic backbone in western Canada. Among many technical and economic factors that affect efficient oil recovery, corrosion problems have long been a big challenge in the Canadian oil industry, especially in Alberta. The extremely corrosive substances in the oil recovery process create severe service conditions, and corrosion damages significantly shorten the lifetime of equipment components, such as slotted liners in the Steam Assisted Gravity Drainage (SAGD) systems, resulting in high production costs, low production efficiency, safety and environment issues. The high cost of repairing/replacement of damaged slotted liners results in dual impacts on technical and financial aspects of the operation. Therefore, it is imperative to systematically investigate the failure mechanisms of slotted liners and the factors affecting the material degradation. A thorough understanding of the underlying controlling factors will lead us towards solving corrosion problems effectively. The proposed research aims to improve corrosion resistance of carbon steels for slotted liners. This can be achieved by investigating corrosion mechanisms and the effect of different slot cutting processes on corrosion and plugging behavior, and then developing a coating that is resistant to corrosion and plugging, technically simple to apply and able to extend service life of the slotted liners. The outcomes of the proposed research will provide direct economic benefits to Alberta and Canadian oil industries. More specifically, the new technical criteria for materials selection, a better slot manufacturing process and the development of an effective coating will provide RGL with a set of practical design criteria for optimizing operational performance of their SAGD system and extending equipment service life. This project will also provide excellent opportunities for training HQPs who will become valuable staff-to-be for RGL or oil companies elsewhere in the country. The knowledge based workforce will, no doubt, greatly strengthen the global competitiveness of Canada.