Study On Distribution Characteristics Of Remaining Oil In P7 Well Area And Design Of Deep Profile Control And Drive Scheme

P7 well block belongs to low and medium permeability reservoir,which has strong heterogeneity and poor physical properties.Since it was put into production in the late last century,the overall water cut of P7 well block has been increasing year by year.As of October 2018,the well block has entered the late stage of high water cut,and the heterogeneity within and between layers has become increasingly prominent,and the distribution of remaining oil is uneven.If water flooding or polymer flooding continue to be used,it will not achieve better expected results.Refer to the development experience of other similar well blocks,select the suitable reservoir The gel flooding system with strong adaptability,strong injection capacity,strong retention capacity and good scouring resistance can be used for deep profile control and flooding in this well area,which can not only satisfy the large dose injection of the profile control agent,but also achieve the side adjustment and drive.Finally,the effective development of the block can be realized.In this paper,the distribution characteristics of remaining oil in P7 well area and the design of injection scheme for deep gel flooding are studied by numerical simulation.Firstly,threedimensional geological model of P7 well block simulation area is established by using petrel software.On this basis,water drive numerical simulation model is established by using CMG numerical simulation software,and water drive history fitting is carried out.The types of remaining oil after water drive in this block are analyzed,including: fault edge type remaining oil,thin difference layer type remaining oil,plane heterogeneous type remaining oil,well network detention area type remaining oil The distribution characteristics of various types of remaining oil are studied quantitatively,and the potential of remaining oil after waterflooding is determined.Then,based on the numerical simulation of water drive,the numerical simulation model of P7 well block is established by using CMG software.According to the concentration of polymer,cross-linking agent,stabilizer and the amount of water control and drive system,five kinds of injection schemes are designed,and the best scheme of water control and drive is finally selected(pre slug: 1000-1800-300 mg / L;main slug: 900-1600-200 mg / L;post slug: 1000-1800-300 mg / L)-1800-300mg/L)? Finally,the development indexes of the optimized injection plan are predicted,and it is predicted that when the water cut reaches 98%,the maximum water cut will be reduced by 6.94%,the oil recovery will be increased by 4.53%,and the final recovery will be 47.86%.