【摘要】 现场测定测试井的土壤环境,发现大庆地区土壤中Cl-含量、SO24-含量均较高,地下土壤电阻率变化较大,在土壤纵向深度上对钢质设备构成强腐蚀影响环境.采用地下参比电极"接触测试"法,对套管实施保护后的纵向深度套管保护电位进行定量测试.结果表明,套管保护电位曲线光滑,电位均负于-850mV,套管保护电流可极化到地下100m.手镯阳极与套管同时下入作业井内,不增加现场作业难度及作业成本,具有实际推广应用价值.更多还原

【Abstract】 By chemical examination in laboratory and test in situ, we found that the Cl- content and SO2-4 content are higher in Daqing oilfield,and the variation of the soil resistivity is bigger.The soils show strong corrosivity along longitudinal depth to steel equipments.By means of contact test with a reference electrode underground,we measured the distribution of casing protection potential along vertical depth.The results indicate that the casing protection potential curve is smooth,and the protection potential is lower than -850 mV.The casing protection current can polarize up to 10000 cm in depth.The bracelet anode and the casing can installed or repaired simultaneously in the fied with no additional troubles and cost to the conventional field operation,therefore, it is of applicable value.更多还原