Present Situation of Repairing Technology of Used Oil Field Tubings and Suggestions for Standardization

Analyzed in the paper are various types of and causes for the failures of oil tubings，such as paraffin precipitation，scaling，eccentric wear，galling and corrosion.The repairing technology for used oil tubings is summerized as 3 stages，i.e.the sorting+cleaning+detecting stage，the re-threading stage，and the re-producing stage.It is recommanded to establish a relevant industry standard by integrating the current repairing methods for used oil tubings，so as to provide a standardized guidance to the repairing of used oil tubings，the manufacturing process，and the field application.