scholarly journals Experimental Study on Coal Permeability Variation during Microwave Radiation

2020 ◽  
Vol 2020 ◽  
pp. 1-18
Author(s):  
Yulin Ma ◽  
Yao Cheng ◽  
Wenlong Shang ◽  
Dong Zhao ◽  
Xianggang Duan
Keyword(s):  
Microwave Radiation ◽  
Effective Stress ◽  
Microwave Power ◽  
Coal Sample ◽  
Clean Energy ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Radiation Technology ◽  
Coal Permeability ◽  
The Relationship

Coal-bed methane (CBM) is a new type of clean energy, which is abundant in China. Rational development and use of CBM can not only reduce the occurrence of mine disasters but also alleviate energy shortages. However, the “high storage capacity and low-permeability” characteristics of China’s CBM have hindered the realization of industrialized CBM production. To study the effect of microwave radiation on the permeability of coal reservoirs, a seepage experiment under different stress and microwave radiation conditions was carried out by using the seepage experiment system of gas-bearing coal under microwave radiation developed by the authors. The relationship among different microwave powers, different irradiation times, different energy inputs, and coal permeability was explored. The results show that the microwave power effect and the temperature effect promote coal permeability. Under microwave radiation, the relationship between permeability and effective stress followed a negative exponential function, and all R-squared values were greater than 0.97. The permeability increased monotonically with increasing microwave power and irradiation time, and the linear fitting slope of the rate of increase in the low-effective-stress area was greater than in the high-effective-stress area. Under the same energy input, permeability increased with rising microwave power. The peak temperature of the coal sample also increased with increasing power. When the microwave power increased to a certain range, the permeability growth of the coal sample was the greatest, and the temperature gradient of the coal-sample temperature field was the steepest. The coal sample experienced the optimum microwave radiation power under the action of microwaves to achieve the permeability enhancement effect of microwaves on the coal sample. The experimental results provide a theoretical reference for applying microwave radiation technology in coal-bed methane extraction.

Numerical Simulation Study on Feasibility of Coal-Bed Methane Reservoir Commingling in Qinduan Block

2014 ◽  
Vol 694 ◽  
pp. 359-363
Author(s):  
Yi Kun Liu ◽  
Yan Yan ◽  
Jin Ming Wang ◽  
Li Hua Xia ◽  
Ting Li ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Clean Energy ◽  
Coal Industry ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Development Costs ◽  
Geological Conditions ◽  
Control Production ◽  
Safety Production ◽  
Target Block

Coal-bed methane (CBM) is clean energy which owns currently the best prospects for development, its efficient development is conducive to the safety production of the coal industry. Commingling can effectively reduce the development costs of coal-bed methane, while improving the methane production. Aiming at the actual geological conditions in Qinduan block, using numerical simulation technology, establish the ideal model based on the actual geological data to make feasibility study of commingling respectively from the permeability and the initial reservoir pressure. The results show that, under the condition of reasonable control production system, the target block can be commingling.

scholarly journals Permeability Prediction in Deep Coal Seam: A Case Study on the No. 3 Coal Seam of the Southern Qinshui Basin in China

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Pinkun Guo ◽  
Yuanping Cheng
Keyword(s):  
Coal Seam ◽  
Effective Stress ◽  
Axial Stress ◽  
Gas Pressure ◽  
Coal Bed ◽  
Stress And Strain ◽  
Qinshui Basin ◽  
Coal Permeability ◽  
Permeability Prediction ◽  
Southern Qinshui Basin

The coal permeability is an important parameter in mine methane control and coal bed methane (CBM) exploitation, which determines the practicability of methane extraction. Permeability prediction in deep coal seam plays a significant role in evaluating the practicability of CBM exploitation. The coal permeability depends on the coal fractures controlled by strata stress, gas pressure, and strata temperature which change with depth. The effect of the strata stress, gas pressure, and strata temperature on the coal (the coal matrix and fracture) under triaxial stress and strain conditions was studied. Then we got the change of coal porosity with strata stress, gas pressure, and strata temperature and established a coal permeability model under tri-axial stress and strain conditions. The permeability of the No. 3 coal seam of the Southern Qinshui Basin in China was predicted, which is consistent with that tested in the field. The effect of the sorption swelling on porosity (permeability) firstly increases rapidly and then slowly with the increase of depth. However, the effect of thermal expansion and effective stress compression on porosity (permeability) increases linearly with the increase of depth. The most effective way to improve the permeability in exploiting CBM or extracting methane is to reduce the effective stress.

Experimental Study of Mechanical and Seepage Characteristics of Two Kinds of Coal Samples

2014 ◽  
Vol 1073-1076 ◽  
pp. 2098-2101
Author(s):  
Wen Pu Li
Keyword(s):  
Coal Sample ◽  
Axial Strain ◽  
Volumetric Strain ◽  
Quadratic Function ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Intensity Level ◽  
Methane Recovery ◽  
Gas Seepage ◽  
Seepage Characteristics

Mechanical and seepage characteristics of raw coal samples are the most important research contents of enhancing coal bed methane recovery, but the produce of raw coal sample is very difficult. Based on gas seepage instrument, mechanical and seepage characteristics were performed on normal briquette coal samples and coal samples containing gypsum. The results show that it can increase the cohesion and intensity level by adding gypsum in briquette coal. Porosity and permeability of coal containing gypsum is less than ordinary briquette coal sample. Permeability with axial strain curves of two kinds of coal samples can be fitted with a quadratic function well. In expansion stage, volumetric strain of ordinary coal sample is much smaller than the coal samples containing gypsum. The research has an important guiding significance on enhancing coal bed methane recovery and gateway supporting.

scholarly journals PERHITUNGAN GAS IN PLACE DAN RECOVERY FACTOR PADA LAPANGAN CBM SUMUR X

PETRO ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 131
Author(s):  
Yusraida Khairani Dalimunthe ◽  
Def Marshal ◽  
Ratnayu Sitaresmi
Keyword(s):  
Coalbed Methane ◽  
Coal Sample ◽  
Curve Analysis ◽  
Volumetric Method ◽  
Recovery Factor ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Field Development ◽  
Methane Gas ◽  
Coalbed Methane Reservoir

<em>The Coal Bed Methane well X is a field developed by company A where 5 CBM test wells have been drilled. This CBM field development in 2004 by drilling wells to a depth of 3000ft, then in 2006 drilling was carried out for three test wells with an average depth of 3000ft. The research conducted at LEMIGAS aims to calculate coalbed methane reservoir reserves, calculation of reserves per seam, recovery factor, from each coal sample. The volumetric method is used in this research to calculate the methane gas reserves and Langmuir curve analysis is used to calculate the recovery factor. The target of this research is the CBM field in well X, where the well has 3 seams, namely seam-2, seam-3, and seam-4. In addition to calculating the value of methane gas reserves for each well, the methane gas reserves for each seam are also calculated. From the results of the calculation, it can be concluded that the largest value of gas in place is on seam 4 which is 573.2 MMscf and the smallest is on seam 2 which is 176.1 MMscf, then the largest recovery factor value is owned by seam 3 which is 91%.</em>

Coal Bed Methane Resources: Hazard and Exploitation

2011 ◽  
Vol 225-226 ◽  
pp. 315-318 ◽  
Author(s):  
Wei Yang ◽  
Bai Quan Lin ◽  
Yong An Qu ◽  
Wu Qiang Zhao ◽  
Yong Ming Jiang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Stress Distribution ◽  
Clean Energy ◽  
Simulation Method ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Coal Face ◽  
The Core ◽  
Stress Drops ◽  
Important Significance

This paper points out that the coal-bed methane can not only cause gas outburst and explosion, but is also the greenhouse gas. At the same time, methane is un-renewable clean energy. In order to exploit methane effectively, the numerical simulation method was used to investigate the stress distribution and evolution during the process of mining the upper protective coal seam. The results match well with the filed experiment. The result revealed that the stress drops significantly and the cracks are much more developed in the “core stress relieved area” within 10 m in front of the coal face and -30 m behind the coal face, where the methane extraction concentration is usually more than 60%. The results have important significance on methane exploitation.

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