A study of applicability limits of Double Q&T P110/Q125 for casing and tubing in low H2S environments is
presented. The study adopted an interdisciplinary approach that combines chemical modeling, material
characterization and fracture mechanics. Chemical modeling calculates H2S solubility in aqueous phase in HTHP
wellbore environments. Characterization of material quantifies materials’ susceptibility to hydrogen sulfide stress
cracking in the simulated H2S environments. Fracture mechanics based FAD analysis using the tested material
data to calculate Pressure Limit for preventing sulfide stress cracking. In the paper, the approach is discussed
first. The applicability limits of Double Q&T P110/Q in various low-concentration H2S well environmental
conditions are presented. Tables that can be used for material selection, design and inspection are illustrated and
discussed.