Automatic well test interpretation based on convolutional neural network for a radial composite reservoir

作者：LI Daolun,LIU Xuliang,ZHA Wenshu,YANG Jinghai,LU Detang

摘要：An automatic well test interpretation method for radial composite reservoirs based on convolutional neural network(CNN) is proposed, and its effectiveness and accuracy are verified by actual field data. In this paper, based on the data transformed by logarithm function and the loss function of mean square error(MSE), the optimal CNN is obtained by reducing the loss function to optimize the network with "dropout" method to avoid over fitting. The trained optimal network can be directly used to interpret the buildup or drawdown pressure data of the well in the radial composite reservoir, that is, the log-log plot of the given measured pressure variation and its derivative data are input into the network, the outputs are corresponding reservoir parameters(mobility ratio, storativity ratio, dimensionless composite radius, and dimensionless group characterizing well storage and skin effects), which realizes the automatic initial fitting of well test interpretation parameters. The method is verified with field measured data of Daqing Oilfield. The research shows that the method has high interpretation accuracy, and it is superior to the analytical method and the least square method.

发文机构：Hefei University of Technology Daqing Well Logging Technology Service Company University of Science and Technology of China

关键词：radialcompositereservoirwelltestinginterpretationconvolutionalneuralnetworkautomaticinterpretationartificialintelligence

分类号： TE353[石油与天然气工程—油气田开发工程]TP183[自动化与计算机技术—控制理论与控制工程]