Experimental determination method for sand-carrying critical flow velocity of shale gas well

The invention provides an experimental determination method for the sand-carrying critical flow velocity of a shale gas well, and belongs to the technical field of gas well drainage and mining process.The method comprises the steps that the yield and well bore structure data of the shale gas well in the full life cycle are collected, the parameter ranges of the gas flow velocity and the liquid flow velocity under the experimental condition are calculated based on the fluid mechanics similarity criterion and the Gray model, and the gas flow velocity and the liquid flow velocity are calculated; a shale gas well sand-carrying physical simulation experiment is carried out, the wellbore sand holdup under different experiment conditions is obtained, and the sand holdup is calculated; small wellbore sand holdup indicates that sand occupies a small area of a gas well production channel and has small influence on gas well production, and large sand holdup affects gas well stable production; by observing the change cur