通过高温、高压腐蚀模拟试验和腐蚀理论分析，研究了某气田气井井筒材料80SS钢在不同H₂S分压（0.005~0.1 MPa）、CO₂分压（0.1~1.0 MPa）及温度（30~90℃）下的腐蚀规律。结果表明：在CO₂分压为1.5 MPa，温度为80℃条件下，随着H₂S分压的增大，80SS钢的腐蚀速率由1.69 mm/a降低至0.12 mm/a，当H₂S分压为0.1 MPa时，试样表面出现细小的点蚀坑；当H₂S分压为0.01 MPa，温度80℃时，随着CO₂分压的增大，80SS钢的腐蚀速率增大，发生极严重腐蚀；当温度由30℃升高至90℃，80SS钢的腐蚀速率由0.24 mm/a逐渐增大至0.98 mm/a，腐蚀产物晶粒变大，试样表面腐蚀产物覆盖不完全，逐渐出现局部腐蚀风险。

The corrosion laws of wellbore material 80SS steel in a gas field under different conditions of H₂S partial pressures (0.005-0.1 MPa), CO₂ partial pressures (0.1-1.0 MPa) and temperatures (30-90 ℃) were studied by high temperature and high pressure corrosion simulation experiment and corrosion theory analysis. The results show that under the condition of CO₂ partial pressure of 1.5 MPa and temperature of 80 ℃, with the increase of H₂S partial pressure, the corrosion rate of 80SS steel decreased from 1.69 mm/a to 0.12 mm/a. When the partial pressure of H₂S was 0.1 MPa, there were tiny pits on the surface of the sample. When the partial pressure of CO₂ increased, the corrosion rate of 80SS steel increased under the condition of H₂S partial pressure of 0.01 MPa and temperature of 80 ℃, and extremely serious corrosion occurred. When the temperature rose from 30 ℃ to 90 ℃, the corrosion rate of 80SS steel increased from 0.24 mm/a to 0.98 mm/a, the grain size of corrosion products increased, and corrosion products could not cover the surface of sample completely, and the risk of localized corrosion gradually appeared.