【摘要】 为探究在CO₂和H₂S共存体系下顺北油气田井下温度、含水率、■分压比对P110S钢腐蚀速率的影响规律,利用高温高压微型反应釜开展了腐蚀模拟试验,并采取失重法计算腐蚀速率。利用JSM-IT300型扫描电子显微镜（SEM）与X射线衍射技术（XRD）对P110S钢材进行了腐蚀表征并对其生成物进行了深入的探究与剖析。研究结果表明:在1 MPa CO₂分压和10 kPa H₂S分压（■）分压比为100),含水率为15%时,P110S钢的腐蚀速率随着温度的上升先上升后降低,当温度达到70℃时,腐蚀速率达到极值0.658 mm/a;在1 MPa CO₂分压和10 kPa H₂S分压,温度为70℃时,P110S的钢腐蚀速率与含水率成正比,其腐蚀速率逐渐上升,直到含水率100%时腐蚀速率出现峰值1.730 mm/a;当温度为70℃,含水率为15%时,P110S钢腐蚀速率随着■分压比的增大先增大后减小。更多还原

【Abstract】 In order to investigate the effects of downhole temperature,water content,and ■ partial pressure ratio on the corrosion rate of P110S steel under the coexistence system of CO₂ and H₂S,corrosion simulation experiments were carried out by using high-temperature and high-pressure microreactors,and the weightlessness method was adopted to calculate the corrosion rate.Using JSM-IT300 scanning electron microscope（SEM） and X-ray diffraction（XRD） technology,the corrosion characterization of P110S steel and its generators were deeply explored and analyzed.The results show that,under the condition of1 MPa CO₂ partial pressure and 10 kPa H₂S partial pressure（■ partial pressure ratio of 100）,and the moisture content of 15%,the corrosion rate of P110s steel first increased and then decreased with the increase of temperature,when the temperature goes to 70 ℃,the corrosion rate reaches an extreme value of 0.658 mm/a;under the condition of 1 MPa CO₂ partial pressure and 10 kPa H₂S partial pressure,and the temperature of 70 ℃,the corrosion rate of P110S steel is proportional to the moisture content,its corrosion rate gradually increased to the peak of 1.730 mm/a until the the moisture content reaches to100%;when the temperature goes to 70 ℃,and the water content reaches to 15%,the corrosion rate of P110s steel first increased and then decreased with the increase of ■ partial pressure ratio.更多还原