摘要
为了认识孔隙中油水两相流动规律,设计了可视化微观玻璃仿真模型水驱实验,直观观察了不同级别孔隙中油水的流动情况;并对不同渗透率级别的岩心样品进行了水驱油实验及核磁共振分析,定量研究了岩心水驱过程中不同孔隙中油的动用规律。结果表明:①水驱油在孔道中主要是以活塞式及非活塞式进行驱替。在部分大中孔道中,由于孔隙的不规则,发生非活塞式驱替,产生膜状残余油或者卡断油滴;而经由小孔道时,则极易形成绕流,从而导致小孔道形成段塞式剩余油;②在同类渗透率的岩心中,大、中孔隙对采出程度作主要贡献,而在不同类渗透率的岩心中,渗透率越大的岩心,其占有大中孔道的比例就越大,则其水驱采出程度越高,最终采收率也越高。
In order to understand the oilwater two phase flowing law in the pores, water flooding experiment in the visual and micro simulation glassmodel is designed, and directly observed oilwater flowing in the differentlev el pores, and designed the oilwater displacement experiment and NMR analysis for some core samples which had different permeability levels, quantitatively researching the oil flowing performance in different pores during the wa ter flooding process. The results showed that： water flooding is always going by the way of piston and nonpiston in the pores. In some large or middle level pores, it developed nonpiston displacement for the irregular pores, pro ducing membranelike residual oil or interrupted dropletoil. But through a small channel, it formed plug type re sidual oil for cross flow; For the same permeability rock cores, the large or middle level pores have major contri bution for the recovery degree. But for the different permeability rock cores, the bigger core＇ s permeability, the larger proportion the large or middle level pores had, so the contribution is bigger for the recovery degree, and wa terflooding recovery is higher.
出处
《科学技术与工程》
北大核心
2014年第10期26-30,共5页
Science Technology and Engineering
关键词
水驱油
微观模型
剩余油
孔隙
核磁共振
water flooding microscopic model residual oil pore nuclear magnetic resonance
