中文摘要：

修井/压裂作业中,油管上多个接箍导致环空流动压耗难以精确预测。按照油田油管和套管的实际尺寸,设计加工一套实验装置,分别改变油管上接箍数量、接箍直径、油管外径、环空排量等参数,测试不同参数组合条件下环空出口和入口的压差,该压差即为当前实验条件下的流动压耗。结果表明：流量较大时,油管接箍数与环空压耗呈线性关系;泵入流量与环空压耗呈二次函数关系。

英文摘要：

In well workover or fracturing operation,annulus pressure loss is difficult to calculate exactly because of the tubing coupling on tubing. An experimental equipment was designed according to actual size of the tubing and casing in oilfield. The pressure difference between annulus outlet and inlet,which is the pressure loss at current experimental conditions,was measured by changing the number and diameter of collars,as well as the external diameter of tubing and annulus flow. The results indicate that when the flow rate is comparatively higher,the number of tubing coupling presents a linear relationship with annulus pressure loss. The annulus pressure loss shows a quadratic function relationship with the flow rate.