Study on Stress Corrosion Characteristics of Different Grade H Sucker Rods

Abstract

In order to obtain the stress corrosion resistance of the different grade H ultra-high-strength sucker rods in high water-bearing fluids and their adaptability to typical well fluids, this paper takes orthogonal stress corrosion test method to research the stress corrosion cracking properties of 30Ni2CrMnMoVA and 30CrMoA under different corrosion conditions, including Cl-, HCO3-, Ca2+ and Cl--HCO3- based on the corresponding provisions of NACE TM 0177 and GB/T15970.1. In this paper, the stress corrosion susceptibility of 30Ni2CrMnMoVA and 30CrMoA materials in different corrosion conditions were investigated and the typical working conditions of different grade H sucker rods are clarified to provide the basis for selection and string design of grade H sucker rods.