地层压力变化对低渗透油藏影响规律研究——以延长油田杏2005井区为例

Study on influence regularity of formation pressure variance on low-permeability reservoir——by taking Xing2005 well block of Yanchang oilfield as an example

通过对延长油田杏2005井区低渗油藏岩心渗透率实验,对比分析了不同的加压速度及方式对储层的影响,及降压生产与油藏压敏性之间的相关性,结果表明,对于低渗透油藏,控制采油速度,合理降低油藏生产压力,可减少渗透率损失,提高油藏最终采收率;地层压力下降太快造成的地层伤害很难得到恢复。

Through core permeability experiment of low permeability reservoirs in Xing2005 well block of Yanchang oilfield,by comparison and analysis of the influence of different compression speed and the manner on reservoirs,as well as the relationship between step-down production and the reservoir pressure sensitive resistance,the results show that for low permeability oil reservoir,the control of oil production rate and reasonable production pressure can reduce the permeability loss,improve the ultimate recovery of the reservoir.The formation damage caused by formation pressure falling so fast is difficult to be recovered.