存在扶正器条件下三元复合溶液环空流动实验与模型研究

基于自主研制的全尺寸井筒复杂流动实验模拟装置,考虑存在扶正器条件下的水平井三元复合驱非牛顿流体井筒流动的复杂特性,开展了抽油杆扶正器对三元复合溶液水平环空流动特性影响的实验研究。结果表明,当管路存在扶正器时,流动压降显著增大,且其随流量仍呈近似指数规律增加。运用非牛顿流体力学理论,结合水力当量长度的概念和实测压降数据,建立了存在扶正器条件下的三元复合溶液非牛顿流体水平同心环空流动的压降预测模型。采用VB.NET对模型进行了编程求解,其平均绝对百分误差在10%以内,性能良好且简单实用。研究成果为后续的存在扶正器条件下的三元复合溶液和原油两相环空流动压降模型的建立及扶正器的优化设计奠定了重要基础。

Experimental study and modeling of ASP flow in an annulus with existence of the centralizer

Considering the complex characteristics of non-Newtonian fluid flow in the horizontal wells with existence of the sucker rod centralizer during ASP flooding, a full scale experimental facility was designed and constructed to investigate the effect of sucker rod centralizer on the ASP flow in a horizontal concentric annulus. The result shows that while a centralizer is installed on the inner pipe of the annuli, the pressure drop increases significantly and yet has a exponential relationship with the volumetric flow rate. Based on non-Newtonian fluid mechanics theory, combining the concept of hydraulic equivalent length and the experimental data, a simple and useful model of ASP flow in a horizontal concentric annuli with existence of the centralizer was developed. The model was implemented using VB.NET and the result was compared to the experimental data. It is indicated that the model has a good performance with a mean absolute percentage error of below 10 %. The achievements obtained in this paper is an important foundation for the model development of ASP and oil two-phase flow in the horizontal wells, which is a significant criterion of the optimization design for real sucker rod centralizer.