Abstract: Uniform displacement of isotropic reservoirs can be established by means of even well spacing or well pattern, but that of anisotropic reservoirs depends on proper regulation of well spacing of different directions by permeability contrasts. This paper presents the theoretical equations for the latter through coordinate transformation and streamtube approaches. The results show that the ratio of well spacings in different directions equals the square root of the ratio of permeability in corresponding directions.

Key words: well pattern, well spacing, reservoir, anisotropy, isotropy