正确评价排砂采油射流泵井百米吨液耗电及系统效率

Correct Evaluation of Power Consumption per 100 m Ton Liquid and System Efficiency of Sand-removing Oil-producting Jet Pump Well

用折算百米吨液耗电及折算系统效率来评价排砂采油射流泵井百米吨液耗电及系统效率的方法,推导出了其计算公式。油层排砂后,表皮系数降到一个绝对值较大的负值,作为油藏驱动力的生产压差减小,动液面升高。射流泵排砂采油往往不但降低了生产压差,而且产量也会增大。油藏驱动效率的增大相当于降低了传统意义上的百米吨液耗电,增加了传统意义上的系统效率。对于排砂采油,排砂前污染越严重以及排砂后表皮系数负值越大,折算系统效率越高。给出了胜利油田郑408-8井经过不排砂有杆泵开采及后来的排砂采油射流泵开采的实例。该井折算百米吨液耗电为7.97KW·h/(100m·t),折算系统效率为30.18%。这两个数据都与不排砂的有杆泵井处于同一数量级。

The power consumption per 100 m ton liquid and system efficiency of the sand-removing oil-producing jet pump well are evaluated by the converted power consumption per 100 m ton liquid and the converted system efficiency, and their formulas are derived. After the sand is released, the skin factor decreases to a negative value of large absolute value, the production pressure difference, which is reservoir driving force, decreases, and the dynamic liquid level rises. Sand-removing oil-producing by jet pump often ot only reduces production pressure difference, but also increases oil production. The increase of reservoir driving efficiency is equivalent to reducing the traditional power consumption per 100 m ton liquid and increasing the system efficiency in the traditional sense. For sand removal production, the more serious the pollution before the sand discharge and the larger the negative value of the skin coefficient after the sand discharge, the higher the converted systeme ffieiency. As an example, the converted power consumption per 100 m ton liquid and the converted system efficiency of well Zheng 408-8 of Shengli Oilfield were calculated, and they are 7.97kW. h/（100m·t） and 30.18% separately. These two data are in the same order of magnitude as those of rod pump well without sand discharge.