The Experimental Research Of Metal Component's Fatigue Damage Repairing With Electric

Casing failure phenomenon exists in most of the world oil. With the increase years ofexploitation,it is becoming more and more serious. Casing failure has become animportant factor of limiting oil production. Major research topic of the subject is thatcasing has some deformation under several common external loads, and then we observethe changes of stress on the inner surface.At last can reache the purpose on detecting thecasing failure.Based on a large number of domestic and foreign research data, the types of thecasing failure are caught. According to the form casing failure and the rock strata activitiesof law, casing force models are established. With finite element analysis software, themodels are meshed as finite element model. loading and calculation, the main researchtopics are summarized as follows:When one side is added constraints and the other side is free, the casing becomesbending deformation after loading. It take several paths on the inner surface of the casing.According to the path, draw the stress curves and observe the changes of stress, studyvariation law. Circumferential stress is presented as wave type, the change of eachposition is consistent, the axial stress change as a straight line, but the direction is not thesame as a different path.It adds constraints in both ends of the casing when the rock slide,the casing becomes bending deformation. With the same method to take the stress pathand to draw the curve, circumferential stress is wavy, but the variations of the forceregional is different form nonforce regional. the axial stress is parabolic, the stress cavesof different path have different directions. Detection and prevention.can be achieved underthese laws.Under the effect of nonuniform loading the casing becomes necking and crowded flatdeformation. according to the type and mudstone water law, it create finite element modelunder different loads,with loading and calculation. several stress paths are selected foranalysis. In the non-uniform stress, damage to the casing always happens in those regionsof small force. This prevention and detection can be achieved by this way.