Failure Analysis And Evaluation To Water Injection Well

After 40 years of development,shengli-oil- field has entered the high water stage.With the development of in-depth the impact of different factors on the casing,it becomes more and more serious and cause casing damage. It Seriously affected the normal production of oil fields. At a large extent, restricted the General Oilfield improve economic efficiency and the development of the production. So it is essential to get a comprehensive understanding of the factors about casing damage.The factors which caused casing damage can be divided into two categories, one is human factors ,the other is environmental factors. With the ongoing production, environmental factors become more complex ,especially the water injection, steam injection development. The stress which casing suffered was changed by the change of stratigraphy stress and the casing corrosion exacerbates by the change of material.The casing with corrosive effect and external forces, the damage accelerates significantly. During the construction processing, because of incorrect construction work, can easily cause damage to casing. Such failures could be strengthened solution by construction management.According to the analysis of safety systems and engineering methods, using the qualitative and quantitative analysis of the security problem, the casing was studied.Product failure was studied by using systems analysis methods and logical reasoning, finding the weak links, to improve product reliability. To identified the causes of the casing failure, throughout failure mode analysis and failure analysis. Firstly,according different damage forms to determine the basic preventive measures. Secondly,we should study casing protection technology research and Casing failure trend. From the prevention and management , we can ensure the normal operation of the casing.