Cause analysis and preventive measures of casing damage in Punan Oilfield

South region of casing damage Wells based on the statistics of Portugal plane and vertical distribution characteristics, combined with dynamic production of oil and water Wells, drilling pressure, measures, Wells and water injection cycle switch formation pressure and oil and water Wells casing damage reason analysis and summarizes the classification, find out the main factors of influence of casing damage, and put forward the effective measures of casing to prevent, reduce the speed of casing damage and to improve oilfield development effect.