气驱点滴水改变渗流阻力驱油实验研究

Experimental Study of Droping Water in Gas Drive to Influence Filtrational Resistance

低渗透油藏注气开发极容易发生气窜,导致采收率降低。研讨一种新型驱替方法,在注入气体的同时,点滴注入水,从而增大驱替相的渗流阻力,减少气窜。随气液比的降低,压力上升无量纲值增加。点滴频率越快,压力上升无量纲值越大,即渗流阻力越大。

The breakthrough of gas usually occur during low permeability reservoir development,that lead to recovery efficiency fall.A new displacing technique is worked over,which droping water on rock core when gas is proceed drive.The new displacing technique will increase the filtrational resistance of injected phase,reduce breakthrough of gas.The air pressure dimensionless parameter will increase as long as the gas fluid ratio decreasing.The rising of frequency of droping water will result in air pressure dimensionless parameter increased,so does filtrational resistance.