Study on Seepage Field of Horizontal Well Pattern in Anisotropic Reservoirs

In order to visually reflect the characteristics of pressure distribution and flowing tracks of reservoir fluid in anisotropic reservoirs, By means of the source-sink theory, Newman´s product method and potential superposition principle, the transient flow pressure distribution equation of horizontal well pattern is obtained, the calculation method of seepage field streamline is presented, and the distribution law for seepage field is studied. It is shown that the seepage field of horizontal well pattern is sensitive to the reservoir anisotropic, the production time and the injection-production ratio. In the pattern of well, in order to form liner water flooding and enhance the effect of displacement, the horizontal well should be vertical to the direction of maximum principal permeability. The longer the production time is, the bigger the pressure propagation area is, and the higher the degree of reserve recovery is. The higher the injection-production ratio is, the bigger the sweeping area of injected fluid is, and the higher the sweeping efficiency is. The seepage field plots generated by this method can provide a scientific basis for the design of horizontal development well pattern and the optimization of injection strategy in anisotropic reservoirs.