底水油藏提高采收率方法及其增油效果——以吐哈油田红连油藏为例

Experimental Study on Enhanced Oil Recovery Methods of Bottom Water Reservoir——Take Hong-Lian Oil Reservoir of Tuha Oilfeild as Example

底水油藏开发受到底水锥进的影响,具有无水采油期短、见水后含水率上升速度快甚至暴性水淹等特点,给油田开发带来不利影响。本文以新疆吐哈红连油藏地质特征和流体性质为实验平台,开展了底水油藏开发效果及其影响因素实验研究。结果表明,对于底水比较发育油藏,扩大水驱注入速度采收率仅为17.7%,采用两性离子聚合物凝胶调剖剂封堵底水后采收率增至28.4%。调剖后二元复合驱的驱油效果好于聚合物的驱油效果,在调剖剂用量相同条件下,单井封堵后二元复合驱采收率为25.9%,油水井同时封堵后二元复合驱采收率为29.5%,可见,与单独实施水井封堵相比较,同时对油水井底水实施封堵作业可以获得更好的水驱和化学驱增油效果。

Under the influence of bottom water coning,bottom water reservoir is characterized by short water free oil production period,the rapid increase of water cut after water breakthrough and even sudden water flooding,which have bad influence on exploitation of oilfield. Based on reservoir geological characteristics and fluid properties of Tuha Hong-lian oil field as the experimental platform and physical simulation technology as experimental method,experimental researches on enhanced oil recovery was conducted,in which influential factors also was investigated. The results showed that,as for bottom water reservoir,water flooding recovery was only 17.7% after improving injection speed;after blocking bottom water with the zwitterionic polymer gel profile control agent,the flooding recovery was increased to 28.4%;the effect of the binary compound flooding was better than that of the polymer flooding after blocking bottom water layer;at the same amount of profile control agent,the oil recovery of the binary compound flooding with blocking bottom water layer at both oil well and water well was 25.9%,3.6% more than binary compound flooding recovery with blocking bottom water layer at water well only,therefore,comparing with blocking bottom water layer at water well,blocking bottom water layer at both oil well and water well could get a better effect of water flooding and chemical flooding.