春光油田携砂液对防砂过程中近井地带渗流特征影响实验研究

Experimental study on the influence of sand-carrying fluid on seepage in near-wellbore area during sand control in Chunguang oilfield

春光油田稀油储层为泥质胶结且胶结疏松、出砂严重,泥质和粉细砂含量较高,防砂难度大。针对春光油田防砂施工后含水迅速上升的情况,使用现场取样的携砂液、地层水、原油进行实验,研究防砂工艺对近井地带渗流的影响特征。实验表明,携砂液对储层岩心有一定伤害,油相相对渗透率下降,水相相对渗透率上升;对应的含水率上升,幅度小于10%。防砂作业携砂液会导致含水上升,但不是主要原因。实验相渗曲线分析显示,春光高渗储层随着含水率升高,油相渗透率显著降低,将会对产量产生比较大的影响。

Light oil reservoirs in Chunguang oilfield are characterized by fine lithology,argillaceous cementation,loose cementation,serious sand production,high content of argillaceous and fine sand,and there is great difficulty in sand control.In view of the rapid increase of water cut after sand control construction in Chunguang oilfield,sand-carrying fluid,formation water and crude oil sampled in the field were used to carry out experiments to study the influence of sand control technology on seepage in near-wellbore area during sand control in Chunguang oilfield.The results show that the sand-carrying fluid has certain damage to the reservoir core,the relative permeability of the oil phase decreases,and the relative permeability of the water phase increases.The corresponding water-cut increases,but the range is less than 10%.Sand-carrying fluid in sand control operation may cause water cut to rise,but it is not the main reason.The experimental phase permeability curve analysis shows that with the increase of water content,the oil-phase permeability of the high-permeability reservoir in Chunguang decreases significantly,which will have a great impact on the production.