榆树林油田提高抽油机系统效率矿场试验

Field testing of increasing system efficiency of pumping wells in Yushulin oilfleld

抽油机井的系统效率主要与地面和井下两大系统能量损失有关。其中井下能耗损失主要与抽油杆运动能耗和深井泵的容积效率有关。由于杯柱运动能耗及深井泵容积效率均与杆柱和抽汲参数设计有关,因此,井筒中杆柱和抽汲参数的优化设计成为影响抽油机系统效率的主要因素。以系统效率为优化目标,在低渗透油田,对于生产状况不合理的油井,及时优化抽汲参数、抽油杆柱等设备。在榆树林油田现场试验3口井,降低冲次、减轻杆柱重量后,系统效率平均提高2.13个百分点,降低了油田能耗、降低了设备投资、降低原油成本。

Energy efficiency of pumping unit is relevant to two parts of energy losses. One is the energy losses of the efficiency of surface pumping equipment, the other is the energy losses of the elficiencv of wellbore pumping equipment. The energy losses in the wellbore are mainly relevant to motion energy losses of sucker rod and volumetric efficiency of bottom hole pump. Both the sucker rod string motion energy losses and volumetric efficiency of bottom hole pump are relevant to the design of the sucker rod string and swab-bing parameter, so the optimum design of the sucker rod string and swabbing parameter in the well becomes the main factor impacting energv efficiency of pumping unit. In low permeability oilfield, it regards energy efficiency as goal of optimizing, optimizing swab-bing parameter and sucker rod string equipment for unreasonable producing state in time. It is of importance for the oilfield to save energy and reduce the cost, to reduce equipment investment, to reduce the crude oil cost. For example, three wells were tested in Yushulin oilfield, through slow down sucker rod speed, lighten sucker rod string, the, energy efficiency of the wells increased 2. 13 percentage points.