Casing shapes and its workover technique for Casing Damage Wells

Casing damage will cause a big economic loss.To different casing damage wells, the appropriate workover technique should be chosen.Several serious casing damage wells include:casing diameter is less than 70 mm,falling matter is the same depth with casing fracture,sand input as serious cave-in,long section bend and shape change,and serious damage for many points.To above several type wells,combining the newest workover researching result in Daqing oilfield,the suitable workover technique is given.The better results are obtained through field application.