Experimental Study Of Hot Water Flooding Of Extra Heavy Oil Reservoirs After Steam Huff And Puff

Heavy oil reservoirs reserve and distribute in many countries and it has become a research hotspot for the development of these kinds of reservoirs at home and abroad.These kinds of reservoirs get huge difficulty to develop because of its special characteristic,especially for extra or super heavy Oil.After a long time of development with steam huff and puff,the oil production declines rapidly,so it is necessary to work on improving exploitation effects under the condition of low oil price.According to the oilfield P601-20 situation,the paper set up a sand filling tube model.Studies on development effect of different injection parameters among hot water flooding and steam injection was made,then the mechanism was inferred on the basis of the remaining oil distribution laws.It shows that it could enhance oil recovery about 22.51%~34.46%with steam injection for the oilfield P601-20 with characteristic of high-permerbility and highporosity.The most efficient injection parameter is 200? and 2mL/min.The best time of changing development method to hot water flooding is that the EOR reaches about 20% with steam injection.The cumulative recovery rate is 31.95%~45.79% with the method of hot water flooding after steam injection,which was better than that of steam injection.The most efficient injection parameter of hot water flooding is 120? and 2mL/min.By analyzing the distribution of the the remaining oil distribution of different improvement methods could prove that hot water flooding after steam injection improves the spread scope and displacement efficiency,then the mechanism were gotted.The experimental study shows that hot water flooding after steam injection can improve the oil recovery,it is conducive to the balanced development of the reservoir,and this development method is relatively effective way to work under the condition of low oil price.