螺杆泵井下油水分离系统设计及地面试验

Design and ground test of downhole oil-water separation system with screw pump

将地面驱动螺杆泵与井下油水分离系统相结合,设计出一种地面驱动螺杆泵井下油水分离系统,介绍系统的结构组成、工作原理,双流道单螺杆泵衬套工作部分长度及双级串联式水力旋流器设计方法。选择X井进行双级串联式水力旋流器的地面实际介质分离性能试验。结果表明:在一定范围内,分流比越大底流含油质量分数越小,底流含油质量分数随入口流量的增大先减小后增大;当分流比大于0.3、入口流量为24～42 m3/d时,底流含油质量分数小于200×10-6;系统关键装置的设计方法是合理的。

An innovative system of downhole oil-water separation with surface driving screw pump was designed by combina- tion of the surface driving screw pump and downhole oil-water separation system. The structure compositions and working principle of this system, the design method of the bushing effective length of the single screw pump with double flow channels and the dual-class hydrocyclone in series were introduced. The X well was used to the separation performance test of the du- al-class hydrocyclone in series with actual media on the ground. The results show that in a certain range, the oil mass fraction of the underflow decreases with the increase of the split ratio and it increases firstly and then decreases with the increase of the inlet flow rate. When the split ratio is larger than O. 3 and the inlet flow rate is between 24 m3/d and 42 m3/d, the oil mass fraction of the underflow is below 200x10-6. The design method of the key devices is reasonable.