Abstract: In order to study the yield-increasing effect of partially perforated deviated wells, the point sink solution in the infinite plate reservoir with closed top and bottom boundaries is obtained through mirror image inversion and then superposition of the spatial instantaneous point sink solution; then, the solution of the partially perforated deviated well is obtained by integration along the deviated well trajectory; finally, a new epidermal model of a partially perforated deviated well is acquired through the late approximation of the pressure solution. The validity of the new epidermal model is verified through comparison with previous models of deviated wells and a partially perforated well epidermis separately. The results show that the epidermal factor gradually decreases with the increase in the deviation angle and bore length of the well; the yield-increasing effect produced by the well deviation angle increase would be more obvious if the well bore length increases; the increase in the anisotropic factors of reservoir thickness and permeability would reduce the yield-increasing effect. Moreover, the well deviation angle increase would make the epidermal factor decrease significantly in the reservoir with smaller anisotropic factors of permeability, in which the partially perforated deviated well with a larger deviation angle and well bore length would have a better yield-increasing effect.

Key words: skin factor, well deviation angle, anisotropic factors, well bore length, reservoir thickness