Analysis on Corrosion Sensitive Factors and Anti-corrosion Measures of Grade D Sucker Rods in Oil-Production Wells

The corrosion behavior of D-class sucker rod in the production well of CO2 flooding in Xinjiang oilfield is investigated by using weight-loss methods and surface analysis technology. The main sensitive factor affecting the D-class sucker rod is determined and the novel safe service life model is established to predict the finite service life of D-class sucker rod. The results show that the temperature and Cl- content is the main sensitive of the steel. D-class sucker rod must be replaced in time after 2 years to prevent the sucker rod from breaking. Three corrosion inhibitors suitable for D-class sucker rod are selected, which can extend the service life of D-class sucker rod to more than 30 years.

Automated summary

The corrosion behavior of D-class sucker rod in the production well of CO2 flooding in Xinjiang oilfield was investigated. The main sensitive factor affecting the rod was determined and a novel safe service life model was established. The study found that temperature and Cl- content were the main factors affecting the steel rod. It was recommended to replace the D-class sucker rod after 2 years to prevent breakage. Additionally, three corrosion inhibitors suitable for the rod were identified, enabling a service life extension of over 30 years.