生产销售  N80地热井用石油套管  支撑井壁用J55石油套管  煤田地质J55石油套管 含税吨价，

 Casing is easy to be corrosive in severe salinity formations,and the basic characteristics of corrosion is pitting,and corrosion shapes are mostly ellipsoid shape.After corrosion the casing wall is thinning,pitting will produce stress concentration,reduce the intensity of the casing,causea serious impact on oil production.By taking P110casing as the research object,elastic-plastic finite element method is used for static analysis of model after casing corrosion.Research shows that after the casing

corrosion to internal pressure and external pressure,the maximum stress and strain occur in the casing corrosion pit wall,two kinds of pressure stress and strain values are little different.As the change of casing corrosion degree,subjected to internal pressure and external pressure,the changing rule of casing maximum Von-Mises stress and the strain are similar.The main factors influencing the strength of casing are corrosion pit depth,namely with the increase of corrosion depth,casing compressive capacity is reduced obviously,and casing cracking pressure is more and more smaller,and the cracking pressure of internal pressure and external pressure is very close.

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