摘要
螺杆泵举升作为主要举升方式已得到广泛应用,但受举升介质及工作参数影响螺杆泵性能不能有效发挥,限制了其泵效最大化。针对螺杆泵采油存在的充不满现象,以螺杆泵泵下油管、吸入口和泵腔内液面为研究对象,分别建立相邻两截面间的伯努利方程,确定泵腔内液面高度;根据转子运动规律,建立泵腔打开体积模型和进入流体体积模型,结合泵腔内液面高度确定螺杆泵的动态充满程度;通过对不同参数的模拟计算分析,动液面、转速是影响螺杆泵充不满的主要因素。现场5口井实际生产效果证明,建立的计算模型误差小于10. 3%。
The poor cognition of progressive cavity pump characteristic limits its further development. In order to determine the mechanism of progressive cavity pump full level,three section( the section of the tube under the pump,the section of pump inlet and the interface between oil and gas in the opened cavity) were chosen,and Bernoulli equation were established between the adjacent sections. The height of the liquid in the opened cavity is confirmed combining gas state equations. According to the periodic reciprocating motion of the rotor,the numerical models for the opened cavity volume and the pumping liquid volume were established,and then the dynamic full level of progressive cavity pump was obtained combining the height of the liquid level in the opened cavity. The results indicate that the main factors upon the progressive cavity pump full level are the height of dynamic liquid level,revolving speed. Through the test of 5 wells,the calculation error of the model is less than 10. 3%.
引文
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