Water - drive and nitrogen - drive experiments are performed to compare their displacement effects and study the displacing mechanism of ultra - low permeability reservoirs.
文中进行了水驱油和氮气驱油试验，以比较驱替效果，探究超低渗油藏的驱替机理。
The fluid flow properties and mechanism of fluid flow in low-permeability reservoir with fractured sandstones are complicated. The spontaneous imbibition of water is very important for oil recovery.
低渗透裂缝性油田开发比较复杂，其中水的自发渗吸对原油的开采十分有利。
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