非牛顿原油结构恢复特性试验研究

Experimental Study on Structure Recovery of Non-Newtonian Crude Oil

通过小振幅振荡剪切试验，对经历预剪切的非牛顿原油在静置条件下的结构恢复性进行了研究。试验结果表明，在静置条件下，反映非牛顿原油结构强度大小的参数Ｇ＾＊等随时间单调增加，但在静置的初始时刻，原油的结构恢复最快。原油经受的预剪切速率越大，其结构恢复速率越大，但相应的准平衡结构强度越小。

The experiment of static structural recovery on pre-sheared non-Newtonian crude oil has been performed by small amplitude oscillatory shear. The results display that structural parameter G reflecting the structure strength of non-Newtonian crude oil increases monotonously with time at static state. The rate of structural recovery is largest at primary moment. The large the pre-shear rate experienced by non-Newtonian crude oil,the large the rate of structural recovery,but the small the structural strength at corresponding psudo-equilibrium state.