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在室内环道上进行了胶凝原油再启动过程的试验。在试验分析的基础上解决了以下几个问题:首先,试验证实管内凝油屈服过程存在三个阶段,以弹性变形理论分析初始屈服段,用有时效的流变方程描述屈服值裂降段,用无时效的流变方程描述残余屈服段;其次,证实压力在管内凝油中传递与声波传播机理不同,压缩管内凝油系统“孔隙”是影响再启动凝油管道压力传递速度的关键因素,多“孔隙”凝油的阻尼作用和管内凝油屈服的径向滞后是两个重要因素。建立了启动凝油管道压力传递速度的新模式,在实验室基础上以动态的热力分析与动态水力分析相结合的方法建立了再启动压力的数学模型,计算结果与试验数据吻合。计算预测到启动凝油管道出现两次压力高峰及“流动半径”的分布。
A trial of the gelling crude restart process was carried out on the indoor circuit. On the basis of the experimental analysis, the following problems are solved: Firstly, the test proves that there are three stages in the yielding process of the condensate in the pipe. The initial yielding section is analyzed by the theory of elastic deformation and the yielding value descending section is described by the aging rheological equation. The residual yielding section is described by the rheological equation without aging. Secondly, it is proved that the pressure in the tube is different from that of the acoustic wave propagation. The “pore” of the condensate system in the tube is the key factor that affects the pressure transmission rate of the tube. The damping effect of multiple “pore” pour-ons and the radial hysteresis of tube pouring are two important factors. The new mode of starting the pressure transmission of the pouring pipeline was established. Based on the laboratory, a mathematical model of the restarting pressure was established by the combination of dynamic thermal analysis and dynamic hydraulic analysis. The calculated results were in good agreement with the experimental data. The calculation predicts two peaks of pressure and “flow radius” distribution in the start-up pipelines.