As. Odeh et Dk. Babu, A GENERALIZED EQUATION FOR CALCULATING THE PRODUCTIVITY OF VERTICAL AND HORIZONTAL WELLS IN HOMOGENEOUS AND STRATIFIED RESERVOIRS, Arabian journal for science and engineering, 19(2B), 1994, pp. 355-369
An equation for calculating the productivity of a horizontal well prod
ucing under pseudo steady-state flow is presented. It is easy to use a
nd is identical in form to that used for a vertical well. With the pro
per changes in variables, the equation can be generalized to cover ver
tical wells. The drainage volume is assumed to be box shaped, and perm
eability anisotropy in the x, y and z-directions is accounted for. Thi
s feature is novel to the Industry. The productivity of a horizontal w
ell in a stratified reservoir with cross flow is also given in an equa
tion form, similar in structure to that of a one layer reservoir. Thes
e equations were derived from very complex general solutions. Example
calculations illustrating the use of the equations are given.