Abstract
The new frontier of oil and gas exploration will be with deep wells. Deep wells generally have higher temperature and pressure. Wells are categorized as being either sweet or sour. Sweet wells are only mildly corrosive, while sour wells are very corrosive. Thus, material selection is especially critical for deep sour wells which contain high concentration of hydrogen sulfide, carbon dioxide, elemental sulfur and chlorides. As these conditions become more severe, tubular material selection goes from stainless steel used for sweet wells, to duplex stainless steel, to nickel based alloy such as UNS N08028, UNS N06985 and UNS N08825, for sour well service. In this paper, Alloy TDJ-028 (UNS N08028) seamless pipe used for OCTG’s has been developed using hot extrusion and cold worked processing. The mechanical tests show that the minimum yield strength grade of TDJ-028 alloy pipe was higher than 110KSI. The hardness, flattening and impact properties of the pipe and coupling stock were very good. Furthermore, the corrosion data is also presented to show the performance of the Alloy TDJ-028 in sour well environment using SCC, SSC tests. The properties of Alloy TDJ-028 pipe met the specification of ISO 13680 and NACE MR0175. So far, Jiuli has the ability to produce massive Alloy TDJ-028 OCTG’s for sour oil and gas wells and the production diameter of the pipe can reach 8 inch.
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