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温度是井下螺杆泵的工作性能的重要影响因素,过高的温度会降低其性能,减少泵的使用寿命,高温还会导致橡胶衬套的膨胀,增大螺杆泵运行时的扭矩。提出了一种橡胶生热计算模型:首先得到螺杆泵橡胶的应力应变,然后利用傅里叶级数拟合其应力应变,通过生热模型计算橡胶的生热率,最后建立了螺杆泵定子橡胶的温度场分析模型。常规螺杆泵和等壁厚螺杆泵的最高温度都在直线段橡胶衬套中点处,但等壁厚螺杆泵的温度分布更加均匀;转速对于螺杆泵定子橡胶衬套的最大温升的影响是成正比的;相同条件下,仅仅考虑橡胶衬套的许可的温度,等壁厚螺杆泵的许用转速比常规螺杆泵更高,这表明在流量变化范围大的领域里(比如煤层气排采),等壁厚螺杆泵更有优势。
Temperature is an important factor in the performance of downhole screw pumps. Excessive temperature will reduce its performance and reduce the service life of the pump. The high temperature will also lead to the expansion of the rubber bush and increase the torque when the screw pump is running. A calculation model of rubber heat generation was proposed. Firstly, the stress and strain of the screw pump rubber were obtained. Then the stress and strain were fitted by Fourier series. The heat generation rate of the rubber was calculated by heat generation model. Finally, Temperature field analysis model. The maximum temperature of the conventional screw pump and the wall thickness screw pump are all at the midpoint of the straight rubber bushing but the temperature distribution of the screw pump with the same wall thickness is more uniform. The influence of the rotation speed on the maximum temperature rise of the screw pump stator rubber bushing is Under the same conditions, the allowable rotation speed of the screw pump with the same wall thickness is higher than that of the conventional screw pump only considering the rubber bushing’s permission, which indicates that in the area where the flow rate changes a lot (such as the coalbed methane ), Such as wall thickness screw pump more advantages.