Study On Temperature Interpretation Model In Multilayer Wells

With the development of intelligent well monitoring technology,distributed temperature sensing(DTS)has been widly used.DTS is installed into the production well as apart of the completion,which can provide real-time,continuous and accurate wellbore temperature data,it is likely to get fluid profile through the interpretation of real time temperature data measured by DTS.Distributed fiber temperature test provides a new approach for reservoir dynamic monitoring.However,there is little of the current interpretation method of real-time temperature monitoring data.Therefore,the paper establishes a temperature interpretation model for multilayer reservoirs:(1)This paper starts with reservoir percolation law and wellbore flow mechanism,based on material balance equation,momentum balance equation and energy balance equation,take a single-phase oil well as the object of the research,establishes the steady-state and transient temperature prediction models of multi-layer reservoirs;(2)Based on the solution of the transient temperature prediction model,the temperature sensitive factors of single-layer reservoirs and multi-layer reservoirs are studied.The results show that reservoir physical properties and oil rate are the main influencing factors to the temperature distribution of wellbore;(3)Based on the study of temperature forward model,this paper also studies the transient temperature interpretation model of multi-layer reservoirs.The inversion model defines the objective function of the measured value and predicted value of the production,temperature and pressure data of the wellbore,and analyzes the weight of the observed value in the objective function.Finally,the inversion model is solved by Levenberg-Marquardt algorithm;(4)The main factors influencing the temperature of the wellbore in the multi-layer reservoir are obtained through the study of the transient temperature prediction model of the multi-layer reservoirs.The study of the transient temperature interpretation model of the multi-layer reservoir is carried out by fitting the wellbore temperature and pressure profile data,The calculation of stratified flow data of multilayer reservoir is realized,and the reliability of the model is verified.The multi-layer reservoir temperature test interpretation model is applied to field examples and achieved good application results.