scholarly journals The research of coal seam gas pressure and initial gas emission characteristics of borehole

2019 ◽  
Vol 7 (5) ◽  
pp. 1961-1969 ◽  
Author(s):  
Jianhua Zeng ◽  
Shixiang Tian ◽  
Guiyi Wu ◽  
Yunjun Zuo ◽  
Shiqing Xu ◽  
...  
Keyword(s):  
Coal Seam ◽  
Gas Pressure ◽  
Emission Characteristics ◽  
Coal Seam Gas ◽  
Gas Emission

Safety line method for the prediction of deep coal-seam gas pressure and its application in coal mines

2012 ◽  
Vol 50 (3) ◽  
pp. 523-529 ◽  
Author(s):  
Liang Wang ◽  
Yuan-ping Cheng ◽  
Lei Wang ◽  
Pin-kun Guo ◽  
Wei Li
Keyword(s):  
Coal Seam ◽  
Coal Mines ◽  
Gas Pressure ◽  
Coal Seam Gas ◽  
Line Method

scholarly journals A New Method for the Measurement of Gas Pressure in Water-Bearing Coal Seams and Its Application

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Xiao Cui ◽  
Jiayong Zhang ◽  
Liwen Guo ◽  
Xuemin Gong
Keyword(s):  
Coal Seam ◽  
Field Experiments ◽  
Water Pressure ◽  
Direct Methods ◽  
Gas Pressure ◽  
New Method ◽  
Well Testing ◽  
Coal Seams ◽  
Coal Seam Gas ◽  
Gas Disaster

Coal seam gas pressure is one of the fundamental parameters used to assess coal seam gas occurrence and is an important index in assessing the risk of gas disaster. However, the geological characteristics of coal seams become increasingly complex with increasing mining degree, thus decreasing the accuracy and success rate of direct methods for measuring gas pressure. To address such issues, we have developed a new method for direct measurement of gas pressure in water-bearing coal seams. In particular, we developed a pressure measurement device based on theoretical analysis and quantified the basic parameters of the device based on well testing. Then, we verified the applicability of our method based on comparative analysis of the results of field experiments and indirect measurements. Our results demonstrate that this new method can resolve the effects of water pressure, coal slime, and other factors on the estimation of gas pressure. The performance of this new method is considerably better than that of traditional methods. In particular, field test results demonstrate that our method can accurately and efficiently measure gas pressure in water-bearing coal seams. These results will be of great significance in the prevention and control of coal seam gas disaster.

scholarly journals Numerical Investigation of Complex Thermal Coal-Gas Interactions in Coal-Gas Migration

2018 ◽  
Vol 2018 ◽  
pp. 1-9
Author(s):  
Xiaoyan Ni ◽  
Peng Gong ◽  
Yi Xue
Keyword(s):  
Coal Seam ◽  
Variable Temperature ◽  
Gas Pressure ◽  
Gas Migration ◽  
Coal Seams ◽  
Coal Seam Gas ◽  
Coal Gas ◽  
Thermal Coal ◽  
Gas Seepage ◽  
Gas Interactions

Understanding the influence of temperature on the gas seepage of coal seams is helpful to achieve the efficient extraction of underground coal seam gas. Thermal coal-gas interactions involve a series of complex interactions between gas and solid coal. Although the interactions between coal and gas have been studied thoroughly, few studies have considered the temperature evolution characteristics of coal seam gas extraction under the condition of variable temperature because of the complexity of the temperature effect on gas drainage. In this study, the fully coupled transient model combines the relationship of gas flow, heat transfer, coal mass deformation, and gas migration under variable temperature conditions and represents an important nonlinear response to gas migration caused by the change of effective stress. Then, this complex model is implemented into a finite element (FE) model and solved through the numerical method. Its reliability was verified by comparing with historical data. Finally, the effect of temperature on coal permeability and gas pressure is studied. The results reveal that the gas pressure in coal fracture is generally higher than that in the matrix blocks. The higher temperature of the coal seam induces the faster increase of the gas pressure. Temperature has a great effect on the gas seepage behavior in the coal seams.

scholarly journals Analysis of Coal Seam Gas Emission Based on Mine Gas Drainage Statistics

2019 ◽  
Vol 384 ◽  
pp. 012163
Author(s):  
Jufeng Zhang ◽  
Xuguang Li ◽  
Fengfeng Yang ◽  
Tai Xu ◽  
Chao Zheng ◽  
...  
Keyword(s):  
Coal Seam ◽  
Coal Seam Gas ◽  
Gas Emission ◽  
Gas Drainage ◽  
Mine Gas

Numerical Simulation on the Influence of Mining-Induced Fractures Field on Gas Drainage and its Application

2011 ◽  
Vol 90-93 ◽  
pp. 477-484
Author(s):  
Shu Jing Zhang ◽  
Yong Wei Peng ◽  
Yong Jiang Yu
Keyword(s):  
Numerical Simulation ◽  
Coal Seam ◽  
Gas Flow ◽  
Underground Mining ◽  
High Strength ◽  
Gas Pressure ◽  
Comsol Multiphysics ◽  
Coal Seam Gas ◽  
Gas Drainage ◽  
Induced Fractures

In order to study the influence of mining-induced fractures field on gas drainage,the paper adopts software of numerical simulation COMSOL Multiphysics to simulate gas drainage of coal seam under the condition of high-strength underground mining. The main aspects can be seen as the following: (1) In the case without considering the fractures, gas drainage in single hole, the gas pressure distribution showed a funnel-type distribution in space along the drainage holes around. (2) The orientation and direction of fractures play a major role on the flow field of gas. In the region that exits fractures, the distribution of gas pressure has a clear fluctuation and adjustment.(3) The numerical simulation of coal seam gas drainage that considered the fracture of coal mining, was closer to the true gas flow.

Study of Sealing Technology of Downward & Permeable Borehole

2012 ◽  
Vol 524-527 ◽  
pp. 351-354 ◽  
Author(s):  
Zu Xiang Hu
Keyword(s):  
Coal Seam ◽  
Wall Rock ◽  
Gas Pressure ◽  
Good Effect ◽  
Time Sharing ◽  
Coal Seam Gas ◽  
Local Practice ◽  
Prediction And Prevention ◽  
Geological Conditions ◽  
Pressure Measure

In gas prediction and prevention , it is important for the Mine-managers to know coal-seam gas-pressure. Because of the limitation of geological conditions,some seam can not use upward bore to measure gas pressure,so using downward bore is essential, but coal-seam gas-pressure measure is difficult on the this condition(QixiangYu. 1992) . In order to resolve this problem, the way of “subsection and time-sharing hole sealing” is propounded in this paper.by using this method, the crevice water of wall rock is blockaded effectively and the influence of measure gas pressure by crevice water is avoided. It can provide guarantee to measure gas pressure under the complicated condition.By the local practice,good effect is achieved.

The Research of Gas Drainage Technology in Daning Coal Mine

2014 ◽  
Vol 580-583 ◽  
pp. 2558-2563 ◽  
Author(s):  
Zhong Ming Zhao ◽  
Gang Wang
Keyword(s):  
Coal Seam ◽  
Coal Mine ◽  
Clean Energy ◽  
Gas Pressure ◽  
Emission Sources ◽  
Gas Emission ◽  
Gas Drainage ◽  
Drainage Rate ◽  
Safe Production

3# coal seam of Daning coal mine is outburst,thus severely restricting the safe production. Based on the analysis of gas emission sources and the logical drainage parameters, firstly, Daning coal mine arranged some drilling fields, then utilized the VLD-1000-type rig to drill boreholes, achieving the integrated gas drainage of the coal seam and goaf. Finally, there is a test on the drainage result. The results showed that, through this kind of integrated gas drainage technology, the highest value of gas pressure in the coal seam reduced to 0.63MPa from 1.95MPa after twelve months’ drainage, and the gas drainage rate of the whole mine reached 77.6%, achieving efficient use of gas clean energy.

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