目的 建立一种全尺寸腐蚀模拟放大试验装置。 方法 针对 CO2 驱油现场的实际情况,综合考虑影响 CO2 驱油腐蚀的各个因素,设计并研制更有效的高温高压 CO2 腐蚀模拟试验装置。 对该装置开展模拟 CO2 腐蚀环境下,多种材料腐蚀特征及缓蚀剂防腐性能的实验研究,并将评价数据与室内高压釜实验、现场腐蚀监测的数据进行对比分析。 结果 该装置可实现液态 CO2 流量 0 ~0. 9 m3 / h、温度-25 ~120 ℃ 、最高压力 32 MPa 下各种矿场腐蚀环境的模拟,能够模拟常规室内研究设备无法模拟的低温-高温高压条件下的多相流动状态,与现场流态更为接近,模拟结果可有效指导 CO2 驱油与埋存工程防腐工艺的制定。 结论 表面矿场条件下的 CO2 腐蚀模拟数据接近矿场实际腐蚀监测数据,实现了井筒、地面设备管道材料和防腐工艺技术的矿场模拟评价。

Objective To set up a test unit for full-size corrosion simulation. Methods According to the comprehensive consideration of various factors affecting CO2 corrosion in CO2 flooding oil field, an advanced simulation test device was designed and developed for high-temperature and high-pressure CO2 corrosion examination. A variety of experimental studies focusing on the corrosion characteristics of materials and anticorrosion properties of corrosion inhibitors were carried out under different simulation conditions using this device, and the evaluation data were comparatively analyzed with the data obtained in indoor autoclave experiment and by field corrosion monitoring. Results Various field site corrosion conditions could be simulated with the conditions of liquid CO2 flow rate of 0 ~ 0. 9 m3 / h, temperature of -25 ~ 120 ℃ , and the max pressure of 32 MPa. The device developed in this work could more effectively simulate the multiphase flow state of CO2 flooding both at low temperature and high temperature and high pressure conditions, which was not able to be accomplished by the usual test devices. The flow state obtained was closer to the field flow state, and the simulation result could effectively guide the establishment of anticorrosion technology for CO2 flooding oil and buried storage projects. Conclusion The CO2 corrosion simulation data obtained in the device under the surface field site condition was close to the actual corrosion monitoring data in the field site. A combined field site evaluation could be set up based on these simulating tests on corrosion and anti-corrosion behavior of wellbore, ground equipment and / or pipe materials.