Abstract: A calculation of formation capacity in QK oilfield was carried out to identify the distribution of main water injection layers. A comprehensive core flowing test based on orthogonal design with 15 core samples (2 000 mD approximately) was carried out and the core permeability damage rate indicated that the damage degree was caused by particle size distribution, concentration and oil concentration. Take all these factors into consideration, the impact on the damage degree in decreasing order was oil concentration, particle concentration and particle size. Meanwhile damage rate was predict applying statistical analysis under other conditions then the error range between the predictive value and the true value, was obtained and verified. The results can be concluded that when particle size, concentration and oil concentrations were of 4 μm, 3 mg/L and 18 mg/L or 4 μm, 7 mg/L and 15 mg/L, damage rate were 22.5% and 25%.

Key words: Formation damage,    , Water injection,    ,  Orthogonal design,    ,  Statistical analysis,     , Prediction

摘要： 通过对地层系数的计算统计明确了 QK油田主力注水层位分布。综合考虑, 取渗透率约为20 0 0mD 的1 5块岩心进行了模拟注水实验, 以岩心渗透率伤害率为指标, 采用正交试验法, 考察了颗粒粒径、 颗粒质量浓度以 及含油质量浓度等因素对伤害率的影响。各因素效应计算表明, 对伤害率影响从大到小依次为含油质量浓度、 颗粒 质量浓度、 颗粒粒径。同时应用统计分析方法对其余条件下的伤害率做了预测, 得到了真实值与预测值之间的误差 范围, 并得以验证。结果显示注水最优条件: 颗粒粒径、 颗粒质量浓度与含油质量浓度分别为4μm、 3m g / L和1 8 m g / L或4μm、 7m g / L与1 5m g / L, 伤害率分别为2 2. 5%及2 5. 0%。

关键词: 储层伤害,  , 注水, 正交设计, 统计分析, 预测