Experimental research on settlement migration law of pulverized coal in shaft of coalbed gas vertical well

A lot of pulverized coal is produced in the process of coalbed gas mining. In order to solve the problem,the static settlement and dynamic settlement and migration experiment of pulverized coal in shaft of coalbed gas well were carried out. The static settlement final velocity of pulverized coal particles with different particle sizes was measured by static settling experiment. Based on the characteristics of pulverized coal production in on-site coalbed gas wells,the dynamic settlement and migration experiment shows that when the drainage velocity is 0. 020 m / s,the pulverized coal particles with a particle size of 0. 20 mm to 0. 30 mm can be carried and transported. When the drainage velocity is 0. 010 m / s,the pulverized coal particles with a particle size of 0. 15 mm to 0. 20 mm can be carried and transported. All of them are greater than static settlement final velocity of pulverized coal particles. When the drainage velocity is 0. 035 m / s, the pulverized coal solution with mixed particle size of 0. 038 5 mm to 0. 450 0 mm can carry the pulverized coal well.