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CMG software was used to build an ideal model whose size ratio is 1:1:0.1, there are three completely closed interlayers whose dip angle is 10 o in the upper model, and the lower model is connected horizontal layer. The thickness ratio between the upper model with the lower model is 2:1, and the permeability ratio is 1:1.8.The water well and the oil well are arranged at the central position of the model's ends along the extending direction of lateral accretion layer, and the horizontal well is arranged at the top of lateral accretion layer on the line of water well to oil well. The angles of the main streamline to the extending direction of lateral accretion layer, the interlayer permeability and the deviation position of the horizontal well in two injection-two production mode are researched on the basis of conventional water flooding-polymer flooding and horizontal well-high concentration polymer flooding. The results show that, as the angle of the main streamline to the extending direction of lateral accretion layer increases, the overall recovery factor decreases. The factor decreases by 5.96% from the angle of 0 o to 45 o . As the horizontal well deviates to one side, the overall recovery factor is reduced. The factor decreases by 4.66% from the center position to the maximum deviation position. Finally with the reduction of the interlayer permeability, the recovery factor of the horizontal well-high concentration polymer flooding increases. The factor can reach 14% when the interlayer is completely closed, while the factor is 4.9%~ 4.5% when the permeability ratio between interlayer with lateral accretion layer is 0.2~0.3.

The Effect of Well Site and interlayer permeability on Recovery Factor of Horizontal Well-High Concentration Polymer Flooding in Lateral Accretion Layer