Study on Flow Model and Flow Equation of Shale Gas Based on Microflow Mechanism

Shale gas storage and permeability space is between nanometers micrometers has strong multiscale characteristics, resulting in highly complicated shale flow. Therefore, the development of needs to clarify seepage mechanism establish a flow model equation that can analyze In this paper, based on single nanotube model, combined with Weiyuan-Changning demonstration zone target layer Longmaxi formation core high-pressure mercury pore throat test results, contribution seepage, diffusion, transition flow, free molecular was calculated. The diffusion over 95%, are main pattern. Then, coupled were established. A method for calculating proposed using relationship pressure velocity. Finally, experiment analysis carried out verify established describe well. result shows rate composed rate. proportional pseudopressure difference proportionate low-pressure squared difference. velocity density, low proportional. As reservoir decreases, proportion increases. research results enrich understanding flow; it also particular reference significance reservoirs.