薄互层状普通稠油油藏注热水开发可行性研究——以辽河曙光油田杜66块下层系为例

A feasibility study of hot-water injection development for thin-interbedded reservoir with heavy oil: a case of Lower Interval of Du66 block in Shuguang oilfield,Liaohe area

杜66块位于辽河断陷盆地西部凹陷西斜坡中段,为一典型的薄互层状普通稠油油藏。经过近20年的蒸汽吞吐开发,杜66块下层系目前已进入吞吐开发后期,地层压力低,吞吐开发效果差。根据杜66块下层系油藏条件及地层流体性质,从注热水开发油藏适应性、吞吐后期剩余油分布规律和注热水开发潜力等3个方面,利用数值模拟技术对杜66块下层系注热水开发可行性进行了系统研究。结果表明,注热水开发可在蒸汽吞吐开发基础上提高采出程度15.69%。这些研究成果对于同类油藏今后进一步改善开发效果具有一定的指导意义。

In Liaohe rifted basin, Du66 block is situated on the middle part in the western slope in the western depression, and is a typical thin-interbedded reservoir with heavy oil. After almost 20 years of development, Lower Interval of Du66 block has come to a later stage of steam stimulation, with the formation pressure lower and the steam stimulation effects poorer. According to the reservoir conditions and fluid properties, a systematic feasibility study of hot-water injection development is conducted by using a numerical technique for Lower Interval of Du66 block in three aspects： （1） adaptability of hot-water injection development; （2） distribution of residual oil in a later stage of steam stimulation; and （3） potential of hot-water injection development. The results have indicated that the recovery efficiency of hot-water injection can be increased by 15.69% over that of steam stimulation. This study is helpful to future improvement of similar reservoir development.