Severe Sour Gas Testing of a High Strength, Corrosion Resistant Ni-Cr-Mo Alloy

摘要

This paper will present the results of a severe sour gas test program on a new high strength, corrosion-resistant alloy for oil and gas applications. This alloy is capable of yield strengths from 160 to 200 ksi (1100 to 1380 MPa) or more through either cold working or cold work + age-hardening. This high strength is achieved while leaving the material with excellent ductility and toughness - far surpassing alloys strengthened through traditional precipitation hardening. Alternatively, the alloy can be produced in the annealed + age-hardened condition, which though providing a somewhat lower yield strength (-120 ksi/830 MPa) has even higher ductility. In addition to these desirable mechanical properties, the alloy exhibits exceptional sour gas resistance. In this paper, we will present the results of sour gas testing (both SSR and 90-day C-ring tests) at temperatures ranging from 401 to 550℉ (205 to 288°C). Tests were conducted both with and without the presence of elemental sulfur. The results of these tests have been used to successfully incorporate high-strength N07022 alloy into the MR0175/ISO 15156 standard.