Production data analysis in a tight gas well in multilayer reservoir

Tight gas wells often produce gas commingled from multiple layers that are hydraulically fractured with multi-stage treatments. Estimation of fracture properties and formation permeability for individual layers is the key for evaluating fracture treatment effectiveness and forecasting future production for these wells.;In this paper, we applied an analytical elliptical flow solution to analyze production data from hydraulically fractured tight gas wells producing from multilayer reservoirs. We were able to estimate the fracture half-length, formation permeability, and minimum drainage area of each layer. This study considered variations in completion details, initial reservoir pressures, reservoir temperatures, and other reservoir parameters in layers producing simultaneously.;The technology we developed includes the following components used in analysis: flow rate allocation using available production logging test data, deconvolution to convert variable rate-pressure data into constant-rate pressure responses, identification of the elliptical flow regime, and analysis of elliptical flow data. We developed and present a new technique to identify the elliptical flow regime. We present results of validation of our method with synthetic cases.