Abstract: The cost of the scheme can be reduced by selecting the appropriate test method and result of wax appearance point (WAT).The WAT of high pour point oil in SY and KF oilfields under different conditions was measured by four test methods.The results showed that the WAT measured by microscopic observation,differential scanning calorimetry,laser and rheological methods decreased in turn. It can be divided into the crystallization temperature,critical wax deposition temperature and deposition influence temperature according to the test conditions.The WAT was independent of wax content,and was greatly influenced by high carbon paraffin.The WAT of live oil near saturation pressure was the smallest,which decreased by 9 ℃ compared with the degrassed crude oil.When the pressure of degrass crude oil increases from 0.1 MPa to 24 MPa,the wax evolution temperature increases by 3.1 ℃.The WAT decreased by 2.9 ℃ when the shear rate of live oil increased from 10 s-1 to 1 191 s-1 under the same pressure.Influenced by the asphaltene deposition, the deposition temperature is higher than the critical wax deposition temperature when the pressure was lower than 15 MPa.The rheological test results meet the engineering needs, and the activation energy method can be utilized to deal with the experimental results.This study can provide theoretical and technical support for the selection of WAT in engineering.

Key words: High pour point oil, Wax evolution temperature, Testing method, Influencing factors, Shear rate

摘要： 选择合适的析蜡点测试方法可降低方案成本。采用4种测试方法测定了SY油田和KF油田高凝油在不同条件下的析蜡点。研究发现，显微观测法、差示热量扫描法、激光法、流变法所测析蜡温度依次降低，根据测试条件可依次划分为析蜡结晶温度、临界蜡沉积温度、沉积影响温度；析蜡温度与含蜡量高低无关，受高碳数石蜡影响较大；饱和压力附近含气原油析蜡温度最小，与脱气原油相比下降9 ℃；脱气原油压力从0.1 MPa增至24 MPa析蜡温度增加3.1 ℃；含气原油相同压力下剪切速率从10 s-1增至1 191 s-1时析蜡温度下降了2.9 ℃；受沥青质沉积影响，压力低于15 MPa后沉积影响温度高于临界蜡沉积温度；流变法测试结果满足工程需要，结合实验结果建议采用活化能法处理。该研究可以为工程中析蜡温度的选取提供理论和技术支持。

关键词: 高凝油, 析蜡温度, 测试方法, 影响因素, 剪切速率