scholarly journals Elimination of coal and gas outburst risk of low‐permeability coal seam using high‐pressure water jet slotting technology: A case study in Shihuatian Coal Mine in Guizhou Province, China

2019 ◽  
Vol 7 (4) ◽  
pp. 1394-1404 ◽  
Author(s):  
Xie Jun ◽  
Liang Yunpei ◽  
Zou Quanle ◽  
Li Lei ◽  
Li Xuelong
Keyword(s):  
High Pressure ◽  
Coal Seam ◽  
Coal Mine ◽  
Water Jet ◽  
Guizhou Province ◽  
Low Permeability ◽  
Gas Outburst ◽  
Pressure Water ◽  
High Pressure Water Jet

Application of High-Pressure Water Jet in Mine

2014 ◽  
Vol 1033-1034 ◽  
pp. 1323-1326
Author(s):  
Guang Wu ◽  
Jia Hui Song ◽  
Ke Bang Hou ◽  
Cong Dong Wang
Keyword(s):  
High Pressure ◽  
Coal Mine ◽  
Water Jet ◽  
Future Application ◽  
Gas Outburst ◽  
Ground Pressure ◽  
Mine Production ◽  
Pressure Water ◽  
High Pressure Water Jet

The principle of high pressure water jet technology and its unique characteristics and advantages were introduced in this paper, specific applications of the high pressure water jet technology in coal mine production and security aspects were analyzed. It was widely used in coal mine tunneling, preventing and controlling ground pressure and gas outburst, the application of the dedusting fan, cutting the coal mine machine and cleaning and descaling downhole equipment. Finally, the feasibility and safety of the high pressure water jet technology in coal mine was summarized, and the article made prospect for its future application.

scholarly journals Study on Pressure Relief Technology of High-Pressure Water Jet of Residual Coal Pillar in Overlying Goaf in Close Seam Mining

2022 ◽  
Vol 2022 ◽  
pp. 1-19
Author(s):  
Shang Yang ◽  
Xuehui Li ◽  
Jun Wang ◽  
Shuhao Yang ◽  
Zhen Shen ◽  
...  
Keyword(s):  
High Pressure ◽  
Coal Seam ◽  
Coal Pillar ◽  
Water Jet ◽  
Hydraulic Support ◽  
Working Face ◽  
Pressure Water ◽  
High Pressure Water Jet ◽  
Residual Coal ◽  
Close Distance

To solve the problem of strong ground pressure behaviour under a residual coal pillar in the overlying goaf of a close-distance coal seam, this paper proposes the technology of weakening and relieving the residual coal pillar in the overlying goaf by a high-pressure water jet. Based on the geological occurrence of the No. 3 coal seam and mountain No. 4 coal seam in the Yanzishan coal mine, the high-pressure water jet pressure relief technology of residual coal pillars in the overlying goaf of close-distance coal seams was studied by theoretical analysis and field industrial tests. First, the elastic-plastic zone of the residual coal pillar and the stress distribution law of the floor are obtained by theoretical analysis, and the influence degree of the residual coal pillar on the support of the lower coal seam working face is revealed. Then, a high-pressure water jet combined with mine pressure is proposed to weaken the residual coal pillar. Finally, through the residual coal pillar hydraulic cutting mechanical model and “double-drilling double-slot” model, the high-pressure water jet drilling layout parameters are determined, and an industrial field test is carried out. The single knife cutting coal output and 38216 working face hydraulic support monitoring data show that high-pressure hydraulic slotting can weaken the strength of the coal body to a certain extent, destroy the integrity of the residual coal pillar, cut off the load transmission path of the overlying strata, and reduce the working resistance of the hydraulic support under the residual coal pillar to a certain extent, which is beneficial to the safe mining of the working face.

Research and Apply the Technique of Dip Rock Cross-Cut Uncovering Serious Outburst Coal Seam Group

2013 ◽  
Vol 868 ◽  
pp. 356-360
Author(s):  
Jun Liu
Keyword(s):  
High Pressure ◽  
Coal Seam ◽  
Coal Dust ◽  
Water Jet ◽  
Pressure Relief ◽  
Dust Extraction ◽  
Pressure Water ◽  
High Pressure Water Jet ◽  
Outburst Coal Seam ◽  
Integrated Technique

Apply high pressure water jet drilling and reaming integrated technique to research the technique of dip cross-cut uncovering serious outburst coal seam group; numerical simulation by FLAC3D concludes that how much the diameters be after being reamed can get relief pressure well at different hole spacing; it shows that the technique expands pressure relief range, increases the permeability of coal and improves the drainage efficient at uncovering coal area in the experiment. Improve the craft and equipment of high pressure water jet drilling and reaming integrated technique, solve the problem of coal dust extraction difficultly at the dip hole, prolong high pressure and rotating joints life; the research indicates that high pressure water jet drilling and reaming integrated technique gets well effect on uncovering coals speed and outburst prevention effect, its of promotion application value to uncovering coal safely and efficiently in mine.

scholarly journals Design and Optimization of High-Pressure Water Jet for Coal Breaking and Punching Nozzle Considering Structural Parameter Interaction

Machines ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 60
Author(s):  
Lihuan Chen ◽  
Muzheng Cheng ◽  
Yi Cai ◽  
Liwen Guo ◽  
Dianrong Gao
Keyword(s):  
High Pressure ◽  
Coal Seam ◽  
Structural Parameters ◽  
Water Jet ◽  
Diameter Ratio ◽  
Divergence Angle ◽  
Pressure Water ◽  
High Pressure Water Jet ◽  
Contraction Angle ◽  
Length To Diameter Ratio

The technology of increasing coal seam permeability by high-pressure water jet has significant advantages in preventing and controlling gas disasters in low-permeability coal seam. The structural parameters of a nozzle are the key to its jet performance. The majority of the current studies take strike velocity as the evaluation index, and the influence of the interaction between the nozzle’s structural parameters on its jet performance is not fully considered. In practice, strike velocity and strike area will affect gas release in the process of coal breaking and punching. To further optimize the structural parameters of coal breaking and punching nozzle, and improve water jet performance, some crucial parameters such as the contraction angle, outlet divergence angle, and length-to-diameter ratio are selected. Meanwhile, the maximum X-axis velocity and effective Y-axis extension distance are used as evaluation indexes. The effect of each key factor on the water jet performance is analyzed by numerical simulation using the single factor method. The significance and importance effect of each factor and their interaction on the water jet performance are quantitatively analyzed using the orthogonal experiment method. Moreover, three optimal combinations are selected for experimental verification. Results show that with an increase in contraction angle, outlet divergence angle, and length-to-diameter ratio, the maximum X-axis velocity increases initially and decreases thereafter. The Y-direction expansion distance of the jet will be improved significantly with an increase in the outlet divergence angle. Through field experiments, the jet performance of the improved nozzle 3 is the best. After optimization, the coal breaking and punching diameter of the nozzle is increased by 118%, and the punching depth is increased by 17.46%.

Investigation of High Pressure Water Jet with Hydraulic Reaming Drainage Radius for Coal Seam Mining

2012 ◽  
Vol 577 ◽  
pp. 147-150 ◽  
Author(s):  
Yong Jiang Zhang ◽  
Xian Zheng Meng ◽  
Jian Jun Cao
Keyword(s):  
High Pressure ◽  
Coal Seam ◽  
Water Jet ◽  
Gas Pressure ◽  
Coal Extraction ◽  
Drainage Radius ◽  
Pressure Water ◽  
New Type ◽  
High Pressure Water Jet ◽  
Seam Mining

Test mine is a large modern mine, the 13-1 coal-seam original permeability coefficient was low, gas pressure and content were higher, coal seam outburst danger of serious, directly extracting coal gas is difficult. Using a new type of high pressure water jet reaming technology, can achieve the expansion of borehole diameter, increase coal seam exposed area and pressure relief range, thereby improving the coal seam permeability, increased coal seam drainage radius. Investigated on the basis of determination of the original coal seam gas pressure and content of the coal extraction radius after the hydraulic reaming. Provide the basis for the seam of the test area borehole design

The mechanism and application of high-pressure water jet technology to prevent compound dynamic disaster

2021 ◽  
Vol 14 (13) ◽  
Author(s):  
Zeng-qiang Yang ◽  
Chang Liu ◽  
Feng-shuo Li ◽  
Lin-ming Dou ◽  
Gang-wei Li ◽  
...  
Keyword(s):  
High Pressure ◽  
Water Jet ◽  
Pressure Water ◽  
Dynamic Disaster ◽  
High Pressure Water Jet

Subcutaneous emphysema following the use of a high-pressure water jet

2001 ◽  
Vol 54 (1) ◽  
pp. 87-88 ◽  
Author(s):  
P.G. Russell ◽  
M. Smith
Keyword(s):  
High Pressure ◽  
Subcutaneous Emphysema ◽  
Water Jet ◽  
Pressure Water ◽  
High Pressure Water Jet
Sign in / Sign up

Export Citation Format

Share Document