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| Corrosion Behavior of 110SS Steel in Supercritical CO2 Phase under Environment with Low H2S |
| Received:September 29, 2020 Revised:November 25, 2020 |
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| DOI：10.7643/issn.1672-9242.2021.01.010 |
| KeyWord:110SS steel supercritical CO2 H2S HTHP corrosion casing and tubing |
| Author | Institution |
| HE Song |
CNOOC Research Institute Co., Ltd., Beijing , China |
| WANG Bei |
University of Science and Technology Beijing, Beijing , China |
| XIE Ren-jun |
CNOOC Research Institute Co., Ltd., Beijing , China |
| WANG Yun |
University of Science and Technology Beijing, Beijing , China |
| GU Lin |
CNOOC Research Institute Co., Ltd., Beijing , China |
| XING Xi-jin |
CNOOC Research Institute Co., Ltd., Beijing , China |
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| Abstract: |
| To clarify the applicability and corrosion mechanism of 110SS steel in supercritical CO2 phase under environment with low H2S, HTHP reactor was adopted to simulate the HTHP low H2S environment at the bottom of gas well. The corrosion rate was measured by weight loss methods; the corrosion behavior was analyzed by the laser scanning confocal microscope (LSCM), the scanning electron microscope (SEM), energy spectrum (EDS), and X-ray diffraction (XRD). The results show that 110SS steel presents uniform corrosion characteristics in the supercritical CO2 phase containing saturated water, with corrosion rates of 0.017 mm/a at 141 ℃, 13.3 MPa CO2 partial pressure, and 1.33 kPa H2S partial pressure. CO2 controls the corrosion. The corrosion film is distributed unevenly in the shape of water beads and has a monolayer structure. The corrosion products are mainly FeCO3, containing a small amount of H2S, and H2S corrosion is mostly concentrated in the interior of the water-bead area. The corrosion film is composed of discontinuous grains, and some parts of the matrix are directly exposed to the corrosive medium, so the protection of the matrix is limited. Taking 0.125 mm/a as the casing and tubing material selection standard, 110SS steel can be selected as casing and tubing material for gas wells with only condensate water and without water accumulation (T≤141 ℃, ≤13.3 MPa, ≤1.33 kPa, Cl–≤4646 mg/L). |
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