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该文以轮南油田LN2TⅠ油藏为例,统计了水洗作用对早期取样岩石物性的影响,利用取自该油田的流体和岩心进行了高温高压下的水洗模拟实验。统计及模拟实验表明:水洗后未形成大孔道,造成水提前突破的主要原因可能是TI层内存在平面与纵向非均质性;现场生产过程中注入水量较小,对储集层物性影响微弱;多倍水洗后束缚水饱和度均略有升高,残余油饱和度略有降低,变化幅度随渗透率降低而变大;岩心渗透率在水洗100倍孔隙体积范围内时变化很小,在100～450倍之间随倍数增加而略有下降,超过450倍后之后几乎保持不变;岩心润湿性向亲水方向转化。
Taking LN2TⅠ reservoir in Lunnan Oilfield as an example, the effect of water washing on petrophysical properties of early sampling rocks was calculated. The experiments of water washing under high temperature and high pressure were carried out by using fluids and cores taken from this oilfield. The statistical and simulation experiments show that the main reason for water breakthrough in advance is that there is no planar and longitudinal inhomogeneities in the TI layer due to no large pore channels formed after water washing. The injected water in the field is small and has little effect on the physical properties of the reservoir ; The irreducible water saturation slightly increased after several times of washing and the residual oil saturation decreased slightly and the change range became larger with the decrease of permeability. The permeability of core changed little when the pore water volume was 100 times, 100 ~ 450 times with the fold increase slightly decreased, more than 450 times after almost unchanged; core wettability to the hydrophilic direction of conversion.