Solution to the problem of interference testing of horizontal wells is a major step forward in understanding the fluid flow behavior of horizontal wells and, therefore, to the efficient implementation of the horizontal well technology. These tests provide valuable information about reservoir characteristics such as areal average transmissibility, storage, and degree of communication between wells.

Due to the larger radius of influence and larger contact area of a horizontal well with the formation than its vertical counterpart, this paper suggests that the transmissibility and storage obtained from interference testing of horizontal wells would be much more representative of the formation than the ones obtained from interference testing of vertical wells.

This paper provides the dimensionless pressure and dimensionless pressure derivative type curves for interference testing of horizontal wells and the appropriate equations to be used in conjunction with the type curves in order to determine transmissibility and storage from field data. Solutions were also obtained for interference testing between horizontal and vertical wells. In addition, this paper recommends that the determination of dimensionless pressure at the horizontal wellbore requires calculating the PD function at small values of both YD and ZD

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