Abstract: The invention discloses a digital imaging technology-based method for calculating relative permeability of tight core, comprising the following steps: step S1: preparing a small column sample of tight core satisfying resolution requirements; step S2: scanning the sample by MicroCT-400 and establish a digital core; step S3: performing statistical analysis on parameters reflecting the characteristics of rock pore structure and shape according to the digital core; step S4: calculating tortuosity fractal dimension DT and porosity fractal dimension Df by a 3D image fractal box dimension algorithm; step S5: performing statistical analysis on maximum pore equivalent diameter ?max and minimum pore equivalent diameter ?min by a label. The present invention solves the problems of time consumption of experiment, instrument accuracy, incapability of repeated calculation simulations and resource waste by repeated physical experiment.

Abstract: The present invention discloses a method for interpreting and evaluating production profile of multi-layer gas reservoir based on downhole distributed temperature monitoring, including: obtaining downhole distributed temperature monitoring data of target well; preprocessing the downhole distributed temperature monitoring data; segmenting the temperature monitoring data according to test curve characteristics of the target well and logging interpretation results; 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 numerical simulation method; comparing the temperatures of each layer of the borehole production profile with the temperature monitoring data after segmentation, obtaining the 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.

Abstract: The invention discloses a digital imaging technology-based method for calculating relative permeability of tight core, comprising the following steps: step S1: preparing a small column sample of tight core satisfying resolution requirements; step S2: scanning the sample by MicroCT-400 and establish a digital core; step S3: performing statistical analysis on parameters reflecting the characteristics of rock pore structure and shape according to the digital core; step S4: calculating tortuosity fractal dimension DT and porosity fractal dimension Df by a 3D image fractal box dimension algorithm; step S5: performing statistical analysis on maximum pore equivalent diameter ?max and minimum pore equivalent diameter ?min by a label. The present invention solves the problems of time consumption of experiment, instrument accuracy, incapability of repeated calculation simulations and resource waste by repeated physical experiment.