DIAGNS: An Interactive Workstation-Based System for Well Test Data Diagnostics and Inversion

Abstract

DIAGNS is a workstation-baed computer system intended ation, routine processing, analysis, interpretation, and inversionof pressure- transient test data from geothermal wells. The package contains four main modules: ( I ) the .Preprocessor.: an interactive graphical system evaluate, interpret. and .deglitch pressure and flowrate records for subsequent use by the other program modules. 1. the .Deconvoluter.. which may be used to intricate flow histories to obtain a .unit response function. to a single flow rate step, the .Type Curve. interactive module, for use in preliminary estimates of reservoir properties (useful for initiating the .Inverter .). and, the .Inverter. module, which performs nonlinear least-squares estimation of model parameters (such as permeability, porosity, boundary locations. skin, storage, for a variety of standard reservoir models. Confidence limits, correlation and covariance matrices are also estimated to help appraise the reliability of the reservoir model parameter values obtained.