Gas Fractal Seepage Properties Research in Soft-Slicing Coal with Triaxial Pressure System

Abstract:

Pore structure of soft-slicing coal (SSC) is analyzed with physical adsorption method. Several experiment schemes are designed to carry out the tests of gas seepage characteristics of soft-slicing coal at the different confining pressures, gas pressures and axial pressures, with the self-developed gas seepage triaxial pressure experimental system. The typical coal from TianFu coal mine is especially sampled with different designed surface area parameters. The experiment results demonstrate the relations between the seepage velocity, the effective axial feed, and gas pressure. Under the conditions of the constant axial and confining pressure, the seepage velocity increases in an exponent way with gas pressure increasing, the permeability coefficient decreases in negative exponent, and this seepage process shows capacity fractal properties.

• Periodical: Advanced Materials Research (Volumes 805-806)
• Pages: 1494-1501
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.805-806.1494
• Online since: September 2013
• Authors: Fu Kai Zhang, Long Jun Xu, Fen Hua Yue, Xiao Qin Zhang, Yu Zhao Feng, Zhi Li Chen, Peng Cheng Xie
• Keywords: Fractal Characteristics, Seepage Process, Soft-Slicing Coal, Triaxial Pressure System

References

[1] ZHOU Junping, XIAN Xuefu, JIANG Yongdong, LI Xiaohong, JIANG Deyi. A permeability model considering the effective stress and coal matrix shrinking effect[J]. Journal of Southwest Petroleum University(Science & Technology Edition) , 2009, 31(1): 4-8. (in chinese).

[2] LI Zhiqiang, XIAN Xuefu, LONG Qingming. Experiment study of coal permeability under different temperature and stres s[J]. Journal of China University of Mining & Technology, 2009, 38(4): 523-527(in chinese).

[3] Yi Jun, Jiang Yongdong, Xian Xuefu. An experimental research on the characters of methane seepage in stress field and temperature field[J]. China Mining Magazine, 2007, 16(5): 113-116. (in chinese).

[4] LIU Baoxian, XIONG Deguo, XIAN Xue-fu. Adsorption and seepage characteristics of coal to methane under electric field[J]. Journal of Chongqing University(Natural Science Edition), 2006, 29(2): 83-85(in chinese).

[5] Yao Yanbin, Liu Dameng, Tang Dazhen et al. Fractal characterization of seepage-pores of coals from China: An investigation on permeability of coals[J]. Computers & Geosciences, 2009, 35: 1159–1166.

DOI: 10.1016/j.cageo.2008.09.005

[6] HAO Jisheng , YUAN Chongfu, ZHANG Zixu. The tectonic coal and its effects on coal and gas outburst[J] . Journal of Jiaozhuo Institute of Technology, 2000, 19(6): 403-406. ( in chinese).

[7] CAI Feng, LIU Zegong, LIN Boquan, I Wei. Analysis research on fissure test of borehole in No. 8 seam deposit of Qinan Mining Area[J]. Coal Science and Technology, 2008, 36(5): 31-34. ( in chinese).

[8] Li Peichao, Kong Xiangyan, Zeng Qinghong and Lu Detang. Sumarizing and analyzing the factors affecting the coefficient of permeability of copal beds[J]. Natural Gas Industry, 2002, 22(5): 45-49.

[9] Sun Peide. Testing study on coal specimen permeability during solid deformation process[J]. Chinese Journal of Rock Mechanics and Engineering, 2001, 20(S1): 1801-1804.

[10] Xu Longjun, Wang Xingmin, Qu Ge, Zhou Zhengguo, and Yue Fenhua. Fractal kinetic characteristics for dissolving and leaching processes of strontium residue. Chin. J. Geochem., 2010, 29(4): 393-397.

DOI: 10.1007/s11631-010-0471-5

[11] Kaiser H, Gethner J S. Proc. of the 1983 International Conf. On Coal Sci. Pittsburgh Pa. 1983, P301.

[12] Fairbridge C, Ng S H, Palmer A D. Fractal analysis of gas adsorption on Syncrude coke [J]. Fuel, 1986, 65 (12): 1759.

DOI: 10.1016/0016-2361(86)90282-6

[13] HUANG Qixiang, IN Guangzhi, JIANG Yongdong, YI Jun. Gas seepage characteristics of briquette samples in a stress field[J]. Journal of Chongqing University, 2008, 33(12): 1436-1440.

[14] Wu Yanqing， Zhang Zhuoyuan. An application of generalized double porosity media model for coupled stress and grounwater flow analysis in fractured rock mass[J]. Journal of Engineering Geology, 1996, 4(2): 40-46.

[15] LU Bo, CHEN Jianping, GE Xiurun, WANG Shuilin. Fractal geometry study on structure of jointed rock mass [J]. Chinese Journal of Rock Mechanics and Engineering, 2005, 24(3): 461-467.

[16] Hanbo S. Influence of mobile particles in sof t clay on permeability [C]. Proceedings of the International Symposium on Soil Structure. Gothernberg : [ s. n. ] , (1973).

[17] ZHANG Yanhong, CHAI Junrui. Study on fractal property of fractured rock mass considering seepage characteristics[j]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(S2): 3423-3429(in chinese).

[18] Long Qingmimg, ZHAO Xusheng, MUJingshan. Experimental study on Influence of Pore Gas Pressure upon Gas Permeability of Coal Seam [J]. Mining Safety & Environmental Protection, 2008, 35(1): 10-12.