ANALYSIS AND APPLICATION OF CONCAVE PRESSURE-RESTORING CURVES FOR OIL WELL

A basic formula for concave pressure-restoring curve and two methods of linear analysis are proposed, applying the theory of non-Darcy low speed seepage flow. The results from the two analytical methods are entirely consistent, and several reservoir parameters, i.e the primary stratigraphic essure, permeability, initial pressure gradients and flow coeficient, can be obtained by using the two methods in the analysis of concave pressure-restoring curve. They are simple and convenient.