Abstract:
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.