Reasons for Erosion-Corrosion of Blowout Pipeline in a Well

Serious leakage and fracture occurred in the blowout pipeline in a well. In order to determine the cause of pipeline failure, the physical and chemical properties, macroscopic morphology, microscopic morphology and corrosion products of the pipeline were measured and observed. The results show that the physical and chemical properties of the failed pipeline did not meet the requirements of company standard. Brittle fracture easily occurred in the pipeline due to the great brittle tendency of the pipeline. The main corrosion product was iron oxide, and the corrosion morphology was characterized by erosion-corrosion. The main cause of corrosion failure of the pipeline was the relative movement between the high-speed flowing corrosion medium and the metal surface, which resulted in erosion-corrosion and final accelerated damage of pipeline metal.