对于地层非均质性的影响，通过注入聚合物段塞调驱，能起到防止气窜，增加注入气驱扫效率。
Prepositive polymer slug displacement can decrease the effect by the formation heterogeneity, prevent the gas breakthrough and improve the displacement sweep efficiency of the injective gas.
具有游离气顶的油藏。气顶供给驱扫能量，使油经储层岩石流入井内。
An oil reservoir with a free gas cap that supplies the energy to sweep the oil through the reservoir rock into the Wells.
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