Horizontal wells provide bilinear pressure signatures

A limiting equation may explain the unexpected pressure signatures that appear to indicate bilinear flow in horizontal-well pressure analysis.These pressure signatures often occur unexpectedly when testing horizontal wells in homogeneous reservoirs, but this phenomenon has received little attention in petroleum literature.The pressure signature of the vertical bilinear flow period is controlled by the distance between the well and the closest boundary, zw, the length of the well, Lw, and the directional permeabilities, kz and kx.The limiting equation for bilinear flow in the horizontal plane is more accurate than the corresponding equation for bilinear flow in the vertical plane. Its accu...

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