A Novel Method for Borehole Blockage Removal and Experimental Study on a Hydraulic Self-Propelled Nozzle in Underground Coal Mines
Abstract
:1. Introduction
2. Analysis of Borehole Collapse
3. Method for Removing CBM Drainage Hole Blockage
4. Experimental Study and Parameter Optimization
4.1. Optimization of Nozzle Inlet Pressure
4.2. High-Pressure Resin Pipe Selection
5. Field Experiment
5.1. Field Experiment Site and Geological Conditions
5.2. Testing Equipment
5.3. Experimental Design and Drilling Parameters
5.4. Analysis of Experimental Results
5.4.1. Analysis of Drilling and Blockage Location in the Borehole
5.4.2. CBM Drainage Effect
6. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Properties | Value |
---|---|
Mean tilt angle | 55° |
Average propensity | 292° |
Thickness of M2-7 coal seam | 0.91 m |
Thickness of M8 coal seam | 2.29 m |
Thickness of M9coal seam | 0.4 m |
Methane content | 18.09–25.87 m3/t |
Number | Direction Angle/(°) | Elevation Angles/(°) | Length of Boreholes/(m) | Number | Direction Angle/(°) | Elevation Angles/(°) | Length of Boreholes/(m) |
---|---|---|---|---|---|---|---|
1 | −72.2 | 82.5 | 66.3 | 7 | 38.2 | 45.4 | 51.2 |
2 | 0 | 70.2 | 52.2 | 8 | −35 | 37.1 | 50.3 |
3 | 58.4 | 68.3 | 58.4 | 9 | 33.8 | 32.9 | 48.3 |
4 | −44.3 | 61.2 | 52 | 10 | −31.2 | 25.8 | 51.8 |
5 | 47.3 | 57.3 | 53.1 | 11 | 0 | 24.1 | 45.9 |
6 | 0 | 47.2 | 44.8 | 12 | 0 | 14.2 | 48.3 |
Number | Before Blockage Removal | After Blockage Removal | ||
---|---|---|---|---|
The Average Pure Volume of the Methane Drainage of a Single Borehole/(L/min) | The Methane Drainage Concentration of a Single Borehole/(%) | The Average Pure Volume of the Methane Drainage of a Single Borehole/(L/min) | The Methane Drainage Concentration of a Single Borehole/(%) | |
1 | ≈0.03 | <5% | 3.67 | 62 |
2 | ≈0.03 | <5% | 3.07 | 56 |
3 | ≈0.03 | <5% | 2.47 | 49 |
4 | ≈0.03 | <5% | 1.91 | 43 |
5 | ≈0.03 | <5% | 2.86 | 54 |
6 | ≈0.03 | <5% | 4.79 | 70 |
7 | ≈0.03 | <5% | 4.79 | 66 |
8 | ≈0.03 | <5% | 4.13 | 64 |
9 | ≈0.03 | <5% | 6.08 | 77 |
10 | ≈0.03 | <5% | 7.30 | 85 |
11 | ≈0.03 | <5% | 6.56 | 81 |
12 | ≈0.03 | <5% | 5.46 | 73 |
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Ge, Z.; Deng, K.; Lu, Y.; Cheng, L.; Zuo, S.; Tian, X. A Novel Method for Borehole Blockage Removal and Experimental Study on a Hydraulic Self-Propelled Nozzle in Underground Coal Mines. Energies 2016, 9, 698. https://doi.org/10.3390/en9090698
Ge Z, Deng K, Lu Y, Cheng L, Zuo S, Tian X. A Novel Method for Borehole Blockage Removal and Experimental Study on a Hydraulic Self-Propelled Nozzle in Underground Coal Mines. Energies. 2016; 9(9):698. https://doi.org/10.3390/en9090698
Chicago/Turabian StyleGe, Zhaolong, Kai Deng, Yiyu Lu, Liang Cheng, Shaojie Zuo, and Xingdi Tian. 2016. "A Novel Method for Borehole Blockage Removal and Experimental Study on a Hydraulic Self-Propelled Nozzle in Underground Coal Mines" Energies 9, no. 9: 698. https://doi.org/10.3390/en9090698