特低渗透储层活性水驱实验研究

Experiment study on surfactant flooding for ultra-low permeability reservoir

通过室内实验研究了活性水、地层水在低渗岩心的渗流规律,拟启动压力梯度随渗透率变化的关系,对比了相同渗透率下的两种流体启动压力梯度的大小。利用稳态"压差—流量"法驱替实验,研究了活性水、地层水在低渗岩心的非线性渗流特征。当压力梯度小于某一值时,地层水渗流出现偏离达西定律的现象,活性水(添加表面活性剂的地层水)也有类似的渗流规律,拟启动压力梯度与渗透率成幂函数关系,活性水的拟启动压力梯度小于地层水。为低渗储层水井降压增注提供了理论依据,对建立有效压力系统和油田高效开发有一定借鉴意义。

The percolation of formation water and aqueous surfactant solution in low permeability cores was investigated in laboratory.The nonlinear flow was investigated in displacement of formation water and active water respectively,meanwhile their TPG(threshold pressure gradient) was measured with the method of stable 'pressure difference–flow capacity'.It was found that TPG was powered with permeability;and the TPG of active water is smaller than formation water.This will give a theory exploration for injection pressure reduction by active water;also have a meaningful guidance for establishing effective displacement system and oilfield development.