Experimental study on automatic docking technology of grouping screen pipe for hydraulic transportation in drill pipes
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摘要:
煤层顶板定向长钻孔成孔后采用筛管完孔是保障工作面回采过程中瓦斯抽采效果的有效护孔措施。为了研究利用钻孔内重入大通径钻杆并在其内水力输送分组筛管自动对接完成全孔段筛管护孔的可行性，利用设计的水力输送筛管测试装置和分组筛管对接装置，进行了钻杆内分组筛管水力输送力及自动对接模拟试验，得到了不同泵量下分组筛管的水力输送节流压差与输送力，并与理论计算结果进行对比分析，同时对分组筛管对接装置的对接可靠性和分组筛管自动对接成功率进行了分析试验。试验结果表明：不同泵量下，节流压差和水力输送力实测值与理论计算值相近且呈指数式增长趋势，在泵量390 L/min时，配套ϕ82 mm节流增压管的分组筛管在ϕ102/ϕ83 mm大通径钻杆内的实测节流压差、水力输送力分别达到1.29 MPa、6 860 N，且分组筛管对接装置的单次对接成功率和分组筛管自动对接成功率分别不小于94.18%、82.23%。
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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图 1 钻杆内水力输送筛管测试装置
Figure 1. Hydraulic transportation screen pipe testing device in drill pipe
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