摘要
注入水中的固相颗粒直接影响低渗透砂岩油藏的注入压力和储层伤害程度。研究了3种注入水(所含固相颗粒累积粒度分布达到90%时所对应粒径分别为1.24,5.05,9.91μm)的注入性和对油相渗透率的伤害程度,并考察其对采收率的影响。结果表明:渗透率小于1.000 mD的岩芯,注入水中固相颗粒的累计粒度分布达到90%(D90)的粒径大于1.00μm时,严重影响了其注入性;在渗透率大于1.000 mD的岩芯中,3种注入水均具有较好的注入性。随着固相颗粒D90粒径的增大,岩芯油相渗透率的伤害程度增大,水驱采收率降低;随着岩芯渗透率的增加,较大粒径的颗粒堵塞岩芯中小孔隙的油流通道,降低了水驱波及能力。结合固相颗粒D90粒径的渗透率伤害率图版,岩芯渗透率大于10.000 mD时,注入水中的颗粒D90粒径可以适当放宽到5.00μm。
The solid particles in the injecting water directly affect injection pressure and the degree of formation damage in low permeability sandstone reservoir. The paper studied the injection of three different sizes of solid particle, whose D9o （the cumulative panicle size distribution of solid particle in the injecting water exceeds 90%）is 1.24, 5.05,9.91μm. and we studied three kinds of inj ectivity water for the degrees of damage on oil phase permeability, and investigate the impact on the recovery. The results show there are problems on injectivity in core of permeability less than 1 mD when particle size, D90, is larger than 1 vm. However, when the permeability of core is larger than 1 roD, the problem goes away. As D90 increases, the degrees of oil permeability damage increases and the water flooding recovery reduces. As the permeability grows, the solid panicle of larger panicle size plugs the flowing channel in small and medium-sized pores, reducing water-flood sweeping ability. Seen from chart of permeability damage, when the core permeability is greater than 10 mD, the particle size, D90, can be 5μm.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2014年第1期134-138,共5页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
中央财政支持地方高校发展专项资金“石油与天然气工程国家一级学科”(P014)
关键词
固相颗粒
粒径
渗透率
注入性
渗透率伤害图版
solid particle
particle size
permeability
inj ectivity
chart of permeability damage
