Meikuang Anquan (Jul 2024)
Experimental study on automatic docking technology of grouping screen pipe for hydraulic transportation in drill pipes
Abstract
It is an effective hole protection measure to ensure the effect of gas drainage in the mining process of the working face by using the screen pipe to complete the borehole after the directional long hole drilling in the coal seam roof. In order to study the feasibility of using the large-diameter drill pipe re-entered into the drill hole and the hydraulic transportation of the grouping screen pipe automatic docking in the drill pipe to complete the full-hole section screen pipe protection, the hydraulic transportation and automatic docking simulation tests of the grouping screen pipe in the drill pipe were carried out using the designed hydraulic transportation screen pipe testing device and the grouping screen pipe docking device, and the hydraulic transportation differential throttling pressure and transportation force of the grouping screen pipe under different pump volumes were obtained, and compared with the theoretical calculation results. At the same time, the docking reliability of the grouping screen pipe docking device and the automatic docking success rate of the grouping screen pipe are analyzed and tested. The test results show that the measured values of differential throttling pressure and hydraulic transportation force are close to the theoretical values and show an exponential growth trend under different pump volumes. When the pump volume is 390 L/min, the measured differential throttling pressure and hydraulic transportation force of the grouping screen pipe with ϕ82 mm throttling booster pipe in the ϕ102/ϕ83 mm large-diameter drill pipe reach 1.29 MPa and 6 860 N respectively, and the single docking success rate of the grouping screen pipe docking device and the automatic docking success rate of the grouping screen pipe are not less than 94.18% and 82.23% respectively.
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