The medium pressure and EOR result from the alternateinjection of gas and liquid. The consuming time of simultaneous injection is the shorter than that of alternate of gas and the liquid.
气体、表面活性剂与聚合物三种物质完全分开交替分段塞注入时压力升幅最小，耗时最长，采收率最小。
2
The ability to alternate rock wettability is studied for 4 commercial surface modified lipophilic nanometric silica (LNS) used for stimulating water injection Wells.