英吉苏凹陷油气层保护及增产措施分析

ANALYZING ON MEASUREMENTS TO RESERVOIR PROTECTION AND PRODUCTION-INCREASE IN YINGJISU SAG IN TARIM BASIN

位于塔里木盆地英吉苏凹陷的英南 2井、龙口 1井在钻遇侏罗—志留系时获良好油气显示 ;英南 2井在侏罗系获高产工业气流 ,是英吉苏凹陷油气勘探的首次突破。但本区储层非均质性较强 ,地层污染严重。通过实验分析及岩心观察发现 ,水锁伤害是本区储层的主要伤害类型 ;物性越差 ,水锁伤害越严重。根据本区储层性质 ,建议采用相应的钻井工艺保层增产 。

It is the first breakthrough of petroleum exploration that the high production of hydrocarbon flow was obtained from the Jurassic reservoir beds in the wildcat well Yingnan 2 in Yingjisu sag in Tarim basin. The good hydrocarbon shows were acquired subsequently from the Jurassic and Silurian reservoir beds that were fairly heterogeneous and were seriously damaged in the wells Longkou 1 and Yingnan 2. Based on experimentation and micro examination of the cores, the conclusions are reached that the water locking is the main reason of the reservoir damage and that the poorer the physical properties of reservoir beds, the more seriously damaged the reservoir beds. The corresponding drilling techniques for reservoir protection and the nitrogen gas/sand stimulation treatment for production increase are proposed.