Correction on Pressure Measured Results of Watery Seam Gas Based on Pressure Recovered Curve

In order to study the water in a downward borehole influenced to the measured results of the seam gas pressure, a correction method of the pressure m easured results of watery seam was provided based on gas pressure recovery curve.With the analysis on the gas pressure and water pressure curve distribution around the pressure measured borehole, it was found that the gas pressure recovery curve of the pressure measured borehole was a double curve shape and the water pressu re recovery curve was a straight line shape.According to the different shape recovery curve, the influence of the water in the borehole to the pressure measured results could be removed with the method and a real value of the seam gas pressure could be obtained.A site application was conducted in D6 seam of Pingmei No.1 mine.Acc ording to the Langmuir formula, a comparison analysis was conducted on the inversed gas pressure and corrected pressure.The results showed that the average error of two pressure was 0.08 MPa and could meet the accurate requirements of the actual application. The reliability of the method was verified.