Corrosion fatigue of carbon steel (CS) in drilling fluids was studied using a self-made rotary bending corrosion fatigue testing apparatus under simulated drilling conditions. Mechanisms of the effects of cyclic stress, chloride (Cl–), sulfide (S2–), and pH of drilling fluids on corrosion fatigue of CS as well as the inhibiting action of the imidazoline inhibitor and oxygen (O2) scavenger sodium sulfite (Na2SO3) on corrosion fatigue were studied. Results showed Cl– and S2– promoted corrosion fatigue crack initiation and growth. Fatigue life was lengthened after reducing subjected stress, increasing the pH of the drilling fluids, or adding the inhibitor and O2 scavenger.

Subject
Pits, Scanning electron microscopy, Corrosion fatigue, Corrosion rate, Sodium chloride, Crack propagation, Drilling fluid, Acidity, Stress, Sodium chloride solution, Corrosion inhibitors, Oxygen, Fracture
Keywords:
drilling fluid, fatigue, imidazoline, inhibitor, oxygen scavenger, pH, stress, type 45 carbon steel
NACE International
1998
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