三低油藏水驱精细挖潜技术

FINE POTENTIAL TAPPING TECHNIQUE FOR WATER-FLOODED THREE-LOW OIL RESERVOIRS

大庆长垣外围油田具有低渗透、低丰度及低产量的特点,是典型的"三低"油藏。1982年投入开发,到2009年较早开发区块进入中高含水期,需要解决如何挖掘相对分散剩余油、控制递减、依靠老井精细水驱挖潜降本增效三大难题。通过创建5个示范区,历经3年试验研究取得了4方面技术成果:发展了更小尺度的构造、储层及剩余油空间定量表征的精细油藏描述技术;完善了多因素相匹配精细个性化注采系统调整技术;发展了多专业融合精细注采结构调整技术;形成了水驱精细挖潜效果评价方法。应用研究成果取得了前所未有的挖潜效果,为长垣外围油田及类似油田改善开发效果提供了保障与依据。

Peripheral oilfields of Daqing Placanticline are characterized by low permeability,low abundance and low production and can be called typical ＂three low＂oil reservoirs. Since they were put into production in 1982,the earlier developed block entered into mid and high water stages in 2009,there are three difficulties to be solved including how to tap the potential of the relatively dispersed remained oil,control the decline and reduce the cost by finely exploiting the potentialities of the water-flooded old wells. With the help of establishing 5 demonstrating blocks and 3-year experimental study,the following four technical achievements were obtained： fine reservoir characterizing technique was developed for quantitatively describe even more smaller size of the structure and reservoir,and furthermore the space of the remained oil; the fine personalized injection-production system adjusting technique with the multi-factor matching was perfected; the fine injection-production structure adjusting technology was developed with many-profession integration; the evaluating method of the fine water-flooded effects of the potential tapping was established. The unprecedented tapping effects have achieved for the research achievements,thus the guarantee and evidences have provided for the improvement of the oilfield development effects of Placanticline peripheral oilfields and similar ones.