Abstract: In this paper we studied the two一dimensional steady state flow problem of a horizontal well in a reservoir with bottom water or edge water, and obtained the flow rate formula of a horizontal well by using mirror image superposition principle of the potential function. We also discussed the effects of the thickness and permeability anisotropy of a reservoir, and the
distance between edge water and well, on the productivity of the horizontal well.

Key words: Horizontal well Flow rate Permeability anisotropy