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Abstract. The length, number of layers, plane and longitudinal heterogeneity of injection wells of the second class reservoir are serious. The fractures are used to relieve the contradiction between the plane and the strata, and the channel edge and get the remaining oil potential difference between site type. In this paper, the parameters related to fracturing are studied, such as the decline of fluid production, the decrease of water cut and the connectivity of river channel. The pressure of polymer flooding stage is determined by the combination of fine reservoir description and logging and well test data. The principle of choosing wells and selecting layers in fracturing wells at each stage of polymer flooding is summed up. After practice, the effect of increasing oil and precipitation is obtained, and an effective way is found for the efficiency of polymer flooding.

Abstract. The length, number of layers, plane and longitudinal heterogeneity of injection wells of the second class reservoir are serious. The fractures are used to relieve the contradiction between the plane and the strata, and the channel edge and get the remaining oil potential difference between site type. In this paper, the parameters related to fracturing are studied, such as the decline of fluid production, the decrease of water cut and the connectivity of river channel. The pressure of polymer flooding stage is determined by the combination of fine reservoir description and logging and well test data. The principle of choosing wells and selecting layers in fracturing wells at each stage of polymer flooding is summed up. After practice, the effect of increasing oil and precipitation is obtained, and an effective way is found for the efficiency of polymer flooding.With the development of polymer flooding in the second type reservoir, the influence of the interlayer and the plane contradiction on the polymer flooding effect of the second class reservoir is becoming more and more serious. Some problems can be solved effectively by the fracturing of the oil production well, but how to effectively improve the oil well fracturing effect, And further improve the efficiency of polymer flooding in the second class reservoirs. Therefore, the problems such as the timing of fracturing, the principle of selection of well selection layer and so on in the polymer flooding stage need further study. Fracturing TimeThrough the numerical simulation and field effect analysis, it is concluded that the main reservoir fracturing in polymer flooding production well should be carried out with the water cut and water cutoff period. The effect of water recovery period is obviously worse. At this time, the thin oil layers should be fractured , To change the low permeability reservoir seepage conditions, in order to improve the degree of its use [1][2].The results of numerical simulation show that the recovery range of fracturing oil recovery is 0.94% in water cut stage and 0.96% in low water cut, respectively, while that of fracturing oil recovery is 0.96% in low water cut. The recovery of the thin and poor reservoir in the water recovery stage can improve the recovery rate by 0.56%, and the recovery rate is higher than that of the main reservoir by fracturing (Table 1).