Abstract During oil production from stratum to wellbore, to prevent the asphaltene precipitation, the rules of the changes of the onset of asphaltene precipitation under different temperature and pressure are systematically studied by laboratory experiment. The results show that the AOPP of the oil samples at 30 °C, 50 °C, and 70 °C are 20 MPa, 17.7 MPa, and 15.5 MPa, respectively. Combined with the temperature and pressure curve of the sampling wellbore, it is predicted that the depth of asphaltene precipitation in the wellbore is 1200–1400 m, which is extremely important for the prevention of asphaltene precipitation during oilfield exploitation.

中文翻译：

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采油过程中沥青质沉淀开始时间变化的试验研究

摘要 为防止沥青质沉淀，从地层到井筒采油过程中，通过室内试验系统研究了不同温度和压力下沥青质沉淀开始的变化规律。结果表明，油样在30℃、50℃和70℃下的AOPP分别为20 MPa、17.7 MPa和15.5 MPa。结合采样井筒的温度和压力曲线，预测井筒中沥青质沉淀深度为1200～1400 m，这对于油田开采过程中防止沥青质沉淀具有极其重要的意义。