Dynamic prediction method of residual gas content distribution for seam after gas pre-drainage

Accoding to the problen of a high dificult o measure the residual gas content of seam and unable to dynaniclly predict after the gas pre-drainage operation,with the anaysis on thegasreserves distrbuton ffected to the residual gasconment distibution.gas predrainage method,borehole layout paramneters,seam and ocal q lt features.,nderground producion activties and others factors a method to dynanically predict theresidual gas conent ditribution could be realied with theprediction unit dvided,the predicion index detemined,prediction model established and the dyamic predicion drawings of the residual gas content distribution drawn.Atynamic predicton model of the residual gas content in N0o.1123 coal mining face of Jhja Nine was established with the nethod. The underground site measured data showed that the max absoute error was 0.86 m13/t and the max relative eror was 18.08%.Finally.the Surertools was applie to drav the dynamic pred ctien drawing of the residual gas content distribution in No.11223 coal mining face and the dynamic prediction could be realized.