It is identified that the said early failure of the tubing resulted from the groove-like mechanical damage caused by the longitudinal abrasion by the sucker rod against the tubing inside surface and the joint corrosion by H 2 S,CO 2 and Cl.

• 指出了抽油杆沿管内壁纵向摩擦形成沟槽状机械损伤,以及H2S、CO2和Cl-共同腐蚀是造成油管早期失效的主要原因。