| abstract |
The invention provides a kind of efficient flushing fluid suitable for low-permeability sandstone oil reservoir, the efficient flushing fluid includes Waterproof lock agent 0.1%~1.0%, expansion-resisting agent 0.5%~3.0%, and cosolvent 5.0%~10.0%, surplus is water.The efficient well-flushing liquid energy of the present invention by low-permeability sandstone reservoir wettability by strong water it is wet to change into weak water wet, eliminate reservoir self-priming capillary force；With ultralow oil water interfacial tension and very strong anti-emulsion ability, water lock, Jia Min injuries can be effectively reduced；With excellent anti-clayswelling performance, water fire extinguishing can be effectively reduced, farthest reservoir protec-tion. |