Method for interpreting and evaluating production profile of multi-layer gas reservoir based on downhole distributed temperature monitoring

A method for interpreting and evaluating production profile of multi-layer gas reservoir based on downhole distributed temperature monitoring, comprising the following steps:

• Step S1:
• obtaining a downhole distributed temperature monitoring data of a target well;
• Step S2:
• preprocessing the downhole distributed temperature monitoring data to obtain a temperature monitoring data of normal trend at different times;
• Step S3:
• segmenting the temperature monitoring data obtained in Step S2 according to a test curve characteristics of the target well and logging interpretation results;
• Step S4:
• using a multi-layer gas reservoir seepage pressure field—temperature field coupled model to calculate temperatures of each layer in the borehole production profile of the target well by a numerical simulation method;
• and
• Step S5:
• comparing the temperatures calculated in Step S4 of each layer of the borehole production profile with the temperature monitoring data after segmentation in Step S3, obtaining an optimal flow rate of each production layer with optimization theories, and obtaining the production profile of the target well based on the optimal flow rate of each production layer.