液压反馈式增压抽油泵设计

Hydraulic feedback type boosting subsurface pump

针对常规有杆泵采油充满度低造成泵效低的问题，设计了一种新型液压反馈式增压抽油泵。叙述了新型泵的增压原理和结构特点；分析了增压柱塞上下行程所受的力、增压柱塞的行程、工作泵吸入口的压力及其与常规泵相比的增压值，以及使用增压装置后工作泵有效冲程的损失等参数的计算公式。设计实例表明，在泵挂深度不增加和油层动液面未改变的情况下，新型泵的充满度明显提高，特别适合在地层能量小、液面低的油井抽汲油液。与常规泵相比，这种泵能减轻驴头悬点载荷，降低能耗，并能提高抽油杆柱等采油设备的工作寿命。

In the light of low efficiency of conventional nd pumps, a new hydraulic feedback type boosting subsufore pump is developed. The working principle and design features of the new pump are described. The equations for calculating the foroes on the boost plunger, the plunger stroke, the pressure at the pump intake and the effective stroke loss of the pump are derived. Calculation shows that, under the condition of no increase of pump setting depth and no change of working liquid level, the fill factor of the new pump is increased remarkably, and the pump is especially suitable for using on wells with low formation energy. By using the new pump, the polished rod load can be decreased, the power consumption can be reduced, and the service life of the rod string can be improved.