Abstract It is often desirable to know patterns created after a number of wells in reservoir have been fractured. Interference testing is one of the best techniques that can be used for estimating some of the important formation properties (transmissibility and storativity) and fracture orientation. Generalized correlations are presented relating (a) the dimensionless pressure response, PD, inter, at the intersection point of the pressure and the pressure derivative to the compass orientation, θ, and (b) the quotient of the dimensionless pressure and the ratio of dimensionless time to the square of the dimensionless radial distance, (tD/rD2)inter, at the intersection point to the compass orientation. The correlations can be used for analyzing interference test pressure response at an unfractured shut-in well caused by a production of a vertically fractured well with a uniform flux, infinite or finite conductivity fracture provided that the half fracture length is known a priori. Detailed procedures for the analysis of interference testing of a vertically fractured well are presented and demostrated through a simulated example.