摘要
双驴头抽油机是在常规型游梁式抽油机的游梁后端安装一个曲率半径按一定规律变化的后驴头，在一个冲程过程中，游梁后臂长度和连杆长度不为常数的游梁式抽油机。它既保留了常规游梁式抽油机皮实耐用、工作可靠的特点，又克服了常规游梁式抽油机不易获得长冲程和因平衡效果不佳而能耗大的不足，是一种长冲程，高效节能抽油机。目前，双驴头抽油机已系列化研发、规模化生产，广泛应用于国内各大油田，尤其受到中、低粘度及高含水油田用户的认可。
Abstract
THe double horse head pumping unit is based on the conventional beam pumping unit where a rear horse head is installed at the end of the beam of which the radius of curvature is changing according to certain law,and in a stroke process,the length of the beam back boom and the pitmen are not constant values for this type of pumping unit. The double horse head pumping unit has conquered the disadvantage of the conventional one which can't easily achieve long stroke and power-wasting from bad balance performance,meanwhile,it remains the advantage of the conventional one which is stable and reliable. So far,the double horse head pumping unit has become a serialized and large-scale production,applied in the main domestic oilfieds,it is especially popular with the oildfiends that produc low or medium viscosity and high water-cut crude.
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