No abstract

Staggered line-drive patterns are widely used in oilfi elds. In this paper, to optimize a staggered pattern of horizontal wells, a 3D problem was divided into two 2D (x-y plane and y-z plane) problems with the pseudo-3D method, conformal transformation and superposition principle. A productivity equation for a horizontal well was deduced, which can be used to optimize the well pattern. A relationship between the length of horizontal wells and the shape factor of well patterns was established. The result shows that optimized well patterns can improve oil production from horizontal wells. This provides a theoretical basis for horizontal well applications to the development of oilfi elds, especially for overall development of oilfi elds by horizontal wells.

In recent years, many people have made some research in horizontal wells of low permeability oil reservoirs. In order to further refinement of the existing research, this paper utilized conformal transformation and Potential superposition principle method to optimize and analyze the productivity of rhombus inverted nine-spot horizontal well pattern in low permeability reservoirs.On the basis of other parameters are given, by analyzing the relationships of dimensionless length and shape factor, dimensionless length and dimensionless output of horizontal well, he optimal shape factor and optimal dimensionless output under different well net area, reservoir thickness, and dimensionless length in low permeability reservoirs was got. The results show that it is suitable for using little well net area in low permeability reservoirs.