宁东油田ND26井区长期关停后开发动态特征研究

Development dynamic characteristics of ND 26 well block in Ningdong oilfield after a long-term shutdown

针对宁东油田ND26井区长期关停后地层能量恢复、压力分布及产能变化等问题,综合运用油藏工程等方法开展关停期间地层能量恢复程度、压力分布规律及试采特征等研究。研究表明,油田关停期间地层压力逐渐恢复,影响压力恢复的主要因素有储层物性、构造部位以及井型;关停期间地层流体重新分布,剩余油向构造高部位富集,油水界面较原始状态已抬升10.0m,构造高部位的复产油井产量恢复快、含水上升幅度小;油井关停再复产不仅能够节能降耗、不改变油田最终采收率,而且有利于地层能量恢复,延长油田的开发寿命。

In view of the problems of ND 26 well block in Ningdong oilfield after a long-term shutdown,such as the formation energy recovery,the pressure distribution and the productivity change,the research on the formation energy recovery degree,the pressure distribution regularity and the trial production characteristics during the shutdown period was carried out by comprehensive application of reservoir engineering and other methods.The results show that the formation pressure gradually recovers during the shutdown period.During the shutdown period,the formation fluid was redistributed and the remaining oil was enriched towards the high part of the structure.The oil-water interface had been raised by 10.0 m compared with the original state.The output of the reproducing wells at the high part of the structure recovered quickly and the water cut increased by a small margin.The shutdown and re-production of oil well not only save the energy and reduce the consumption,but also not change the final recovery rate of oil field.Besides that,it is helpful to restore the formation energy and prolong the development life of oilfield.