Experimental Study on the Influence of Adsorption Equilibrium Pressure on the Fractal Characteristics of Briquette Drilling Cuttings
This work is aimed to establish a correlation between the fractal dimension of the microstructure of coal shavings and the pressure of coal seam gas,and to develop an efficient and convenient method for measuring the pressure of coal seam gas.The self-developed coal seam drilling simulation experiment system was employed to investigate the impact of adsorption equilibrium pressure on the fractal characteristics of drilling cuttings.The findings indicate that as the adsorption e-quilibrium pressure increases,the non-uniformity coefficients of the perimeter diameter,area diameter,long diameter and short diameter of drilling cuttings exhibit a decline.The perimeter diameter is the largest,followed by the long diameter and short diameter,and the area diameter is the smallest.As the adsorption equilibrium pressure increases,the particle size distri-bution range of drilling cuttings gradually narrows,resulting in a more uniform particle size distribution and a concentration of particles into a smaller size range.A linear negative correlation exists between the fractal dimension of drilling cuttings and the adsorption equilibrium pressure.In practical working settings,the use of a laser particle size analyzer and the box count-ing method to determine the fractal dimension of drilling cuttings allows for rapid and precise estimation of gas pressure with-in a coal seam.
gas pressuredrilling cuttingsfractal theorynon-uniformity coefficientfractal dimension
万方数据
维普
