![]() The characteristics of different reservoir flow regimes can be observed from the plot. #PARAMETER ESTIMATION BY SEQUENTIAL TESTING MANUAL#Manual interpretation uses the pressure derivative plot introduced by Bourdet et al. Traditional methods of well test interpretation are usually based on a combination of manual and automated techniques, although both techniques are usually computer based. The initial estimates of reservoir parameters from the neural network were found to be reasonably close to the eventual estimates from the sequential predictive probability method. ![]() The algorithm written to interpret the neural network signals into flow regimes required special procedures to take care of the misclassification from the neural network. The trained neural network was able to identify the characteristic components of the derivative curve in most cases. The method discriminates between the candidate models and simultaneously performs nonlinear regression to compute the best estimates of reservoir parameters. Reservoir parameters are then computed using the data in the identified range of the corresponding behavior.Īs a final step, the candidate models and their initial estimates are evaluated using the sequential probability method. We use the neural network to identify the characteristic components of the pressure derivative curve corresponding to the flow regimes known to be in each candidate model. ![]() This method is dependent on obtaining good initial estimates for the parameters governing the candidate reservoir models, which is achieved by applying the artificial neural network approach. The sequential predictive probability method considers all possible reservoir models and determines which candidate model or models best predict the well response. We propose a robust way of achieving a well test interpretation by combining the sequential predictive probability method with an artificial neural network approach. ![]()
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