悬浮颗粒过滤线性解析模型研究

Study on linear analytical model for suspended particle filtration

为了研究产出水回注过程中固相颗粒与乳化油滴对吸水能力的影响,从深部过滤与外滤饼形成两个方面对悬浮颗粒过滤模型进行了研究,优化了模型参数——滤失系数λ与地层伤害系数β的求解方式。通过岩心驱替实验数据拟合求解曲线,并采用数值法求解超越方程获得模型参数,得出滤失系数λ、地层伤害系数β、阻抗斜率m在不同相态悬浮颗粒影响下的变化规律。通过实验数据分段拟合深部过滤与外滤饼形成阶段的阻抗,计算出岩心内的颗粒浓度在流动方向上的分布。

In order to study the influence of suspended particles and emulsified oil droplets on the water absorbing capacity in produced water reinjection process,we analyzed the suspended particles filtration model by the depth filtration and formation of the external filter cake,and optimized the solution of the model parameters(the filtration coefficientλand the formation damage coefficientβ).Based on the solution curves fitted by the core flooding experiment data,and by the numerical solution of the transcendental equation,we obtained the variation rule of filtration coefficient(λ),formation damage coefficient(β)and impedance slope(m)under the influence of different phase suspended particles.Then we got the impedance of the depth filtration and filter cake formation with piecewise fitting and calculated the particle concentration distribution of the core.