Temperature Response Characteristics of the Production Profile for Multilayered Gas Wells Based on Distributed Temperature Sensing Monitoring

Abstract

The distributed temperature sensing (DTS) is used to overcome the defects of traditional production profile testing technology and realize the real-time and accurate temperature monitoring of complex underground reservoirs. However, the temperature response characteristics of the production profile for multilayered gas wells have not been studied clearly, which leads to technical problems of the production profile interpretation of such gas wells monitored by DTS. Therefore, considering the influence of the fluid heat convection, viscous dissipation, and heat conduction which are the involved mechanisms in this process, a model coupling pressure and temperature fields of a multilayered gas reservoir are established in the current study. Subsequently, the formation temperature variation for transient testing of a multilayered gas reservoir is solved by programming, and the effect of model parameters (e.g., gas production, permeability, and rock heat capacity ratio) on the temperature response characteristics of the production profile is analyzed. Finally, the accuracy and reliability of temperature response prediction are verified by fitting the actual DTS temperature test data of an offshore-multilayered gas well. The results of this study provide ideas regarding quantitative interpretation and analysis of DTS monitoring data for the production profile of multilayered gas wells.