Mathematical Formulation of Interference Tests Analyses Procedure for Horizontal and Vertical Wells Both in a Laterally Infinite Layered Reservoir

摘要

Analytical procedures, based on dimensionless pressures and derivative distribution of different com binations of vertical and horizontal wells in the layers of a crossflow layered reservoir, are derived. Results show that analytical expressions for calculating fluid and reservoir properties depends on the type of well used as active well during interference test. If the wells are completed within the same layer, only regional permeability between the wells will determine the rate of interference apart from the rate of withdrawal from the active well. In this case, horizontal wells produce stronger interference than a vertical well given the same anisotropy and rate history. If the wells are located in different layers, then the degree of crossflow between the layers becomes the most important factor affecting interference.