CAJ | 학술논문

为了弄清特高含水油藏微观剩余油类型及提高剩余油的动用效果，进行了微观水驱油特征试验研究。在分析剩余油的几何特征和建立孔喉特征分析方法的基础上，进行了剩余油分类。采用微观可视化驱替试验、图像识别与统计等方法，定量分析了改变液流方向对微观剩余油的影响。试验结果分析表明：不改变液流方向的水驱剩余油饱和度为20.90％；改变液流方向后，继续水驱后剩余油饱和度降为9.69％；改变液流方向后原油采收率可提高11.2百分点。研究表明，改变液流方向后，随着注水量增加，分支状和连片型剩余油饱和度呈指数递减，油膜状、柱状和滴状剩余油饱和度先增大后减小，符合二次多项式函数关系。研究结果为水驱提高剩余油采出程度提供了理论基础。
위료롱청특고함수유장미관잉여유류형급제고잉여유적동용효과，진행료미관수구유특정시험연구。재분석잉여유적궤하특정화건립공후특정분석방법적기출상，진행료잉여유분류。채용미관가시화구체시험、도상식별여통계등방법，정량분석료개변액류방향대미관잉여유적영향。시험결과분석표명：불개변액류방향적수구잉여유포화도위20.90％；개변액류방향후，계속수구후잉여유포화도강위9.69％；개변액류방향후원유채수솔가제고11.2백분점。연구표명，개변액류방향후，수착주수량증가，분지상화련편형잉여유포화도정지수체감，유막상、주상화적상잉여유포화도선증대후감소，부합이차다항식함수관계。연구결과위수구제고잉여유채출정도제공료이론기출。
To understand the type of remaining oil and the efficiency of enhance d oil recovery (EOR) in super‐high water‐cut oil reservoirs ,experiments were conducted on the characteristic of oil displacement by water in micro‐model .Based on analytical methods of geometric characterization of remaining oil and pore throats ,remaining oil was classified .Moreover ,flow direction effects on microscopic remaining oil were i‐dentified by using visible waterflooding test in micro‐model ,image recognition ,statistical calculation tech‐nology ,and other methods .Results showed that final oil saturation is 20.90% when flow direction remain unchanged .Nevertheless ,it drops to 9.69% in continuous waterflooding if flow direction is changed ,which could be raised by 11.2 percent of oil recovery .The research indicated that ,the saturation of contiguous and branched remaining oil declines in exponential function ,w hile the saturation of droplet ,columnar or oil film remaining oil increases then declines in quadratic polynomial function with water injection after flow direction change .The research provides a theoretical basis for improving the recovery of remaining oil through waterflooding .