Abstract
The scarcity of oil and gas resources made High Pressure and High Temperature (HPHT) reservoir attractive to be developed. The sour service environment gives an additional factor in material selection for HPHT reservoir. Austenitic 28 Cr and super duplex stainless steel 2507 (SS 2507) are proposed to be a potential materials candidate for such conditions. C-ring tests were performed to investigate their corrosion behavior, specifically sulfide stress cracking (SSC) and sulfide stress cracking susceptibility. The C-ring tests were done under 2.55 % H2S (31.48 psia) and 50 % CO2 (617.25 psia). The testing was done in static environment conditions. Regardless of good SSC resistance for both materials, different pitting resistance is seen in both materials. The pitting resistance did not follow the general Pitting Resistance Equivalent Number (PREN), since SS 2507 super duplex (PREN > 40) has more pitting density than 28 Cr austenitic stainless steel (PREN < 40). SS 2507 super duplex pit shape tends to be larger but shallower than 28 Cr austenitic stainless steel. 28 Cr austenitic stainless steel has a smaller pit density, yet deeper and isolated.
Highlights
The amount of oil and gas reserves in Indonesia is currently declining
Regardless of good stress cracking (SSC) resistance for both materials, different pitting resistance is seen in both materials
The surface cracks indications in 2507 duplex stainless steel did not penetrate to the subsurface of the metal, and there is no sign of propagation from the base of the pits
Summary
The amount of oil and gas reserves in Indonesia is currently declining. Various reservoirs in the main zone have been produced, so that for the sustainability of new oil and gas sources the future direction of developers are High-Pressure and High Temperature (HPHT) wells. With the active geological conditions in Indonesia, the existence of reserves with HPHT well types are very big. High Pressure (HP) typically refers to borehole pressures between 10,000–20,000 psi, while High Temperature (HT) refers to borehole temperatures between 300–400 ̊F (149–204 ̊C). HPHT operating conditions are exacerbated by the presence of corrosive gases such as H2S and CO2, as well as brine fluids that contain a lot of chlorides. To support the success of this project, corrosion-resistant materials are needed for Oil Country Tubular Goods (OCTG)
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