Application of Well Test Interpretation in Oilfield Based on PDA Method in Tight Gas Reservoir

The reservoir characteristics of tight sandstone gas reservoirs are characterized by low porosity and low permeability, which brings difficulties to the conventional pressure recovery well test in oil fields. The lower porosity and permeability greatly extend the test time. Radial flow was not detected when the oil well was shut down for more than one month. The well test curve showed strong multi-solution characteristics and could not obtain accurate formation parameters. In this paper, based on the characteristics of tight gas reservoirs, the well test interpretation method (PDA method) is applied to the application of production data. A set of explanations for using the production data to explain tight gas wells and carrying out capacity evaluation and prediction are proposed. The interpretation of the production data of 1 is compared with the interpretation results of the pressure recovery test of the well. The two methods have good consistency, and the multiple interpretation methods can better reduce the multi-solution of the well test interpretation, and verify the PDA. The feasibility of the method applied on tight gas wells, and finally the correctness of the method was verified by the capacity prediction method.