Study on the Migration Performance of Oily Sludge Particle Plugging Agent in Reservoir Pores
According to the characteristics of sludge particles,the migration law of oily sludge particle plugging agent in reservoir pores was investigated,which could be used for profile control of water injection wells,blocking water flow channels,expanding the swept volume of water injection,and achieving enhanced recovery.The experimental results shown that particle plugging agent could break-through the porous channel and move to the depth when the injection pressure was increased during migration process.The artificial core was filled with quartz sand of different particle sizes,and the permeability level was 300-500 μm2.During the injection process,the injection pressure rose steadily to a certain extent,and then suddenly dropped.The sludge driven by the external force gradually moved to the depth of the formation.With the increase of the injection amount,the sludge particles accumulated in the formation pores,and the resistance and the injection increased.This phenomenon indicated that the oily sludge particle plugging agent had good migration performance in pores,and could enter deep formation,achieving deep plugging.When contrast experiment between oily sludge and gel system was carried out,comparing to the conventional profile control system(0.2％polymer+0.2％phenol formaldehyde resin cross linking agent),the sludge particle plugging agent had better advantages.and the injection pressure and enhanced oil recovery range of particle plugging agent were better than that of gel system.The injection pressure of sludge plugging agent reached to 1.32 MPa,and the oil recovery reached to 50.9％,and the plugging strength increased by 0.42 MPa(gel pressure was 0.9 MPa,sludge plugging agent pressure was 1.32 MPa).Oily sludge particle plugging agent had good injection performance in fractured reservoir,and could achieve deep migration in reservoir and the role of deep reservoir plugging pores by entering deep formation.
万方数据
维普
