生物礁灰岩底水裂缝型油藏开采规律及技术对策

Production Regularity and Technical Countermeasures for Fractured Reef Limestone Reservoir with Bottom Water

大型块状生物礁灰岩底水裂缝型油藏非均质强、剩余油分布复杂、调整井位部署难、采出程度低。为了解决此类油田的开采问题,分析了底水油藏的产水特征。研究发现:在大裂缝发育部位,底水活动主要表现出"水窜"特征;在裂缝不发育部位,底水活动表现出"水侵"特征。针对大型块状生物礁灰岩底水裂缝型油藏剩余油较富集且分布复杂的特点,调研了国内外油田的开采措施,提出了2种开采技术对策:1注气开采技术;2控锥技术:包括化学堵水措施和采水消锥工艺进行。

Large massive fractured reef limestone reservoir with bottom water has characteristics of strong heterogeneity,complex residual oil distribution,difficulty in adjustment of well deployment,and low recovery. In order to resolve the above problems,characteristics of production water for bottom water reservoir was analyzed. Research reveals that bottom water activity behaves as water cut mainly in fracture developed zone and presenting as water influx in fracture undeveloped zone.For the richness in residual oil and complex distribution of the large bulk fractured reef limestone with bottom water,exploitation measures domestically and overseas was reviewed,proposing two countermeasures： 1gas injection technology; 2water coning control technology which including chemical water plugging and elimination of water cone technology.