摘要
本文根据大庆油田历年来密闭取心油水饱和度与残余油物理化学性质分析资料,研究了注水开发油田储层残余油物理化学性质变化特征与变化因素,初步探讨了储层不同含水饱和度与残余油含量变化与分布,并提出了残余油物理化学性质与变化因素的研究方法。 本文认为储层残余油性质变化很大程度上决定于水洗程度、注入水的性质及水中各种金属元素含量变化。由于注入水的长期冲刷,必然造成残余油中轻组分的减少,重组分富集,而使储层残余油的相对密度,平均分子量,非烃和沥青质含量发生变化。本文研究结果表明,残留在微细孔隙中受毛细管力束缚及未水洗到夹层内与低渗透带的残余油物理化学性质稳定。
<ABSTRACT> The physicochemical properties of residual oil in the reservoir rocks are studied according to the analytical data of oil-water or residual oil saturation obtained from Daqing oilfield with pressure-tight coring over the years. The changes and distributions of water or residual oil saturation in the reser voirs are discussed and a method has been advanced to research them as well.
It is suggested that the physicochemical properties of reservoir residual oil are varied with the.flushing effect and metallic elements of injected water. Owing to the long-time flushipg of injected water, the light and heavy components of
the residual oil are bound to decrease and concentrate respectively, so that the relative density, average molecular weight, nonhydrocarbons and bituminous matters are changed. The experiment results indicate that the phvsicochemical properties of residual oil in the microporous nonflushed interlayers and low permeability zones are stable because of the effect of capillary force acting on it.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
1990年第1期53-62,共10页
Petroleum Geology & Oilfield Development in Daqing
关键词
油田
残油
开发
注水
物理化学
: water flooded, residual oil, physicochemical property,character istic change, variation factor
