Application of in-seam directional drilling technology for gas drainage with benefits to gas outburst control and greenhouse gas reductions in Daning coal mine, China

2014 ◽  
Vol 73 (3) ◽  
pp. 1419-1437 ◽  
Author(s):  
Shouqing Lu ◽  
Yuanping Cheng ◽  
Jinmin Ma ◽  
Yuebing Zhang
Keyword(s):  
Greenhouse Gas ◽  
Coal Mine ◽  
Directional Drilling ◽  
Gas Drainage ◽  
Gas Outburst ◽  
Drilling Technology

scholarly journals Study on Optimization of Gas Drainage Methods in High-burst Mines

2019 ◽  
Vol 118 ◽  
pp. 03034
Author(s):  
Fengfeng Yang ◽  
Dongfang Gao ◽  
Jufeng Zhang ◽  
Kezhen Zhao ◽  
Tai Xu ◽  
...  
Keyword(s):  
Coal Mine ◽  
Extraction Method ◽  
Gas Extraction ◽  
Gas Emission ◽  
Gas Drainage ◽  
Composition Ratio ◽  
Gas Outburst ◽  
Actual Production ◽  
Extraction Parameters ◽  
Production Conditions

After the mechanization upgrade of Yongjing Coal Mine, the original extraction method cannot solve the problem of gas. According to the actual production conditions of the mine, the source and composition ratio of gas emission are analyzed.By combining with the gas extraction method before upgrading and transformation, it is of great importance to determine the appropriate comprehensive gas extraction method and optimize the gas extraction parameters for improving the gas extraction effect and eliminating the risk of gas outburst.

scholarly journals Reasonable Scope of Kilometer Drilling in Lower Layer of Extrathick Coal Seam: A Case Study of Tingnan Coal Mine, China

2021 ◽  
Vol 2021 ◽  
pp. 1-17
Author(s):  
Delong Zou ◽  
Xiang Zhang
Keyword(s):  
Coal Seam ◽  
Coal Mine ◽  
Lower Layer ◽  
Maximum Depth ◽  
Support Pressure ◽  
Directional Drilling ◽  
Pressure Relief ◽  
Gas Drainage ◽  
Working Face ◽  
Fracture Development

When stratified mining is adopted in high-gas and extrathick coal seam, a large amount of pressure-relief gas of the lower layer flows into the upper layer goaf along the cracks in the layer, resulting in upper layer working face to frequently exceed the gas limit. And ordinary drilling can no longer meet the requirements of the pressure-relief gas drainage of the lower layer. The 205 working face of Tingnan Coal Mine is taken as the test background in this paper, and based on the “pressure-relief and flow-increase” effect of the lower layer under the action of mining stress during the upper layer mining, the gas drainage of kilometer directional drilling in lower layer is studied. According to the distribution characteristics of support pressure before and after the working face, the pressure-relief principle, fracture development characteristics, and gas migration law of the lower layered coal body are analyzed in the process of advancing the upper layered working face in the extrathick coal seam with high gas. The maximum depth of goaf damage is calculated theoretically, and the Flac3D numerical simulation of the failure deformation of the 205 working face floor is carried out. It is found that the maximum depth of plastic failure of the lower layer is about 13 m. According to the plastic deformation of the lower layer under different vertical depths and the movement of coal and rock mass, it is determined that the reasonable range of kilometer directional drilling in the lower layer is 6–9 m below the floor vertical depth. From 15 m to 45 m in the two parallel grooves, there is no fracture failure with a sharp increase or decrease in the displacement in the local range. Meanwhile, in this part, the roof falling behind is not easy to compaction, and the displacement of the floor is large, which does not cause plastic damage. The degree of pressure relief is more sufficient, and the permeability of the lower layer is good. Therefore, drilling should be arranged as much as possible along the working face in this tendency range. The determination of reasonable arrangement range of kilometer directional drilling in extrathick coal seam provides reference index and theoretical guidance for industrial test of working face and also provides new ideas for gas control of stratified mining face in high-gas and extrathick coal seam.

scholarly journals Status and Development of Directional Drilling Technology in Coal Mine

2014 ◽  
Vol 73 ◽  
pp. 289-298 ◽  
Author(s):  
Yao Ningping ◽  
Zhang Jie ◽  
Jin Xing ◽  
Huang Hanjing
Keyword(s):  
Coal Mine ◽  
Directional Drilling ◽  
Drilling Technology

Studies to the Coal Gas Draining Feasibility and Potential Evaluation

2011 ◽  
Vol 63-64 ◽  
pp. 728-731
Author(s):  
Chun Wei Hui
Keyword(s):  
Coal Mine ◽  
General Analysis ◽  
Gas Explosion ◽  
Gas Drainage ◽  
Mine Area ◽  
Coal Gas ◽  
Gas Outburst ◽  
Coal Mine Gas ◽  
Mine Production ◽  
Potential Evaluation

The coal mine gas can cause gas explosion and gas outburst, which is a direct threat to the safety of coal mine production. The gas drainage technology is the highlights in the research of highly gassy mine and coal and gas outburst. Coal gas drainage in the coal mine area includes ground gas development and underground gas drainage. Therefore, the evaluation to the draining feasibility of the coal gas should also be divided into ground coal gas development and underground gas drainage. Draining feasibility of the gas refers to the draining extent in a certain area and the possibility of the development under existing economical situations. By general analysis to the geological parameter that influences the draining feasibility, the drainage area will be optimized in this paper. With the reservoir bed data analog technology, the draining feasibility of the coal gas in the DaFosi field and its draining protential will the evaluated in this paper.

scholarly journals Advanced directional drilling technology for gas drainage and exploration in Australian coal mines

2011 ◽  
Vol 26 ◽  
pp. 25-36 ◽  
Author(s):  
Fangtian Wang ◽  
Ting X Ren ◽  
Frank Hungerford ◽  
Shihao Tu ◽  
Naj Aziz
Keyword(s):  
Coal Mines ◽  
Directional Drilling ◽  
Gas Drainage ◽  
Drilling Technology ◽  
Australian Coal

Study on the Drilling Formation Selection and Risk Analysis of the Directional Drilling

2012 ◽  
Vol 461 ◽  
pp. 652-655
Author(s):  
Ying Wu ◽  
Peng Zhang ◽  
Xiao Li
Keyword(s):  
Site Investigation ◽  
Construction Site ◽  
Construction Process ◽  
Directional Drilling ◽  
Selection Methods ◽  
Related Literature ◽  
Literature Research ◽  
Geological Conditions ◽  
Drilling Technology ◽  
Pipeline Crossing

Directional drilling technology is an important and very promising trenchless pipeline crossing technology. On the basis of the related literature research at home and abroad and our pipeline construction site investigation, focuses on several common soil properties are introduced, and then the formation adaptability of directional drilling is analyzed. The drilling selection methods are made when drilling in the specific geological conditions, and the possible risks of the construction process have been classified in the directional drilling.

scholarly journals Prediction Model for Spontaneous Combustion of Coal around Boreholes Using Bedding Gas Drainage

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Youxin Zhao ◽  
Qingjie Qi ◽  
Xinlei Jia
Keyword(s):  
Coal Seam ◽  
Coal Mine ◽  
Negative Pressure ◽  
Spontaneous Combustion ◽  
Orthogonal Test ◽  
Gas Drainage ◽  
Positive Linear Correlation ◽  
Drainage Hole ◽  
Spontaneous Combustion Of Coal ◽  
Fractured Coal

To accurately and reliably predict the time of spontaneous combustion of fractured coal around a borehole induced by gas drainage along the seam, this study performed an orthogonal test taking the No. 10 Coal Mine of Pingdingshan as the research object, in terms of the suction negative pressure and coal seam buried depth. COMSOL Multiphysics was used to model the orthogonal test results, and a multielement statistical analysis of four factors and their relationships with the spontaneous combustion of coal around the borehole and a single-factor analysis in line with the site conditions were performed on the modeling results through multiple regression. The results showed a nonlinear regression relationship between the sealing hole length, sealing hole depth, negative pressure, and coal seam depth and the spontaneous combustion of the coal around the gas drainage borehole; the prediction regression model is significant. Taking the field gas drainage in the No. 10 Coal Mine of Pingdingshan as an example, the relationship between the time of spontaneous combustion of gas drainage and the drainage pressure follows a power of two. When the drainage negative pressure is less than 45 kPa, the coal around the borehole is more likely to undergo spontaneous combustion with increasing pressure, and the sealing hole length has a positive linear correlation with the time of spontaneous combustion of the coal around the borehole. When the sealing hole length is 23 m, the time of spontaneous combustion of the coal around the gas drainage hole is >500 days, and the coal around the borehole does not easily undergo spontaneous combustion. When the sealing depth is 15 m, the time of spontaneous combustion of the coal around the gas drainage hole is 76 days, which is most likely to cause spontaneous combustion.

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