Analysis on Failure Mechanism of Sucker Rod Pumping System

Abstract

There is the higher fault probability under the bad work conditions of the rod pumping system.According to the failure of the sucker rod pumping installation, a comprehensive survey is carried out. There is many influence factors of deep well pump working downhole, not only influenced by the machine, wells, pumping equipment, but also by sand, wax, gas, water. Pump conditions can be diagnosed by surface dynamometer card, surface dynamometer card is the first-hand information collected in pumping well of oilfields. By analyze the Characteristics of the different fault dynamometer, Lay the foundation for the further fault diagnosis and prediction. The different pattern of the different dynamometer is important.

Study on Variable Stress Corrosion Susceptibility of Four Typical High-Strength Sucker Rods in High-Salinity Well Fluids

“…Among them, the grade D high-strength 4142 and 20CrMoA sucker rods are more affected by stress corrosion when the service strength is greater than 75% σ b. (4) The test results described by the weight-loss-based corrosion rate and plastic loss may be contradictory to the determination of the corrosion susceptibility of the material under working conditions.…”

“…Grade D and grade H highstrength sucker rods are widely used in oil production engineering due to their excellent mechanical properties and bearing capacity [2,3]. However, in their actual application in oil wells, the produced water reinjection in the middle and late period of the oil field causes an increase in the water content and the salinity of the well fluid, the working environment of the sucker rod worsens, and the corrosion failure of the sucker rod under variable tensile stress becomes increasingly serious, making the service life of the high-strength sucker rod generally shorter than its expected life [4][5][6][7][8][9][10]. At present, the used pumping rod is designed according to the requirements of an SY/T5029-2006 sucker rod [11].…”