Advertisement

Experimental Study on the Microstructure Evolution Laws in Coal Seam Affected by Temperature Impact

  • Shumin Liu
  • Dengke WangEmail author
  • Guangzhi YinEmail author
  • Minghui Li
  • Xuelong Li
Original Paper
  • 332 Downloads

Abstract

The microstructure of coal has a significant influence on the permeability of the coal seam. To study the characteristics of microstructure changes in coal seam under temperature impact, we conducted temperature-impact experiments using a high–low temperature test system, and we studied the coal pores and fissure structure before and after the temperature impact using scanning electron microscopy, industrial micro-computed tomography, and mercury intrusion. Based on the digital image processing technology and thermal stress theory, we qualitatively and quantitatively analyzed the variation of crack width, specific surface area, and pore diameter, and deeply analyzed the failure mechanism of temperature impact on coal seam microstructure. The results showed that the temperature impact caused the macropores to interpenetrate and form macroscopic cracks in the coal sample, which resulted in a relatively small volume of macropores and increased the volume of mesopores and small pores. The maximum thermal stress generated during the temperature impact process was located in the tangential direction of the coal sample surface. The thermal stress generated by the temperature impact exceeded the tensile strength of the coal sample, which directly causes crack initiation, expansion, and mutual penetration. This study provided the technical support necessary for the efficient development of coalbed methane and the improvement of gas drainage rate in the coal seam.

Keywords

Temperature impact Pore and fissure structure Thermal stress Failure mechanism 

List of Symbols

E

Elastic modulus

J0 (gnr)

The first zero-order Bessel functions

J1 (gnr)

The first-order Bessel functions

b

Radius of the cylindrical coal sample

gn

A positive root

h

Exothermic coefficient

κ

Thermal conductivity coefficient

r

Distance from any point in the cross-section to the center of the cross-section (0 ≤ r ≤ b)

α

Linear expansion coefficient

μ

Poisson’s ratio

σr

Thermal stress in the radial direction

σθ

Thermal stress in the tangential direction perpendicular

ΔT

Temperature difference

Notes

Acknowledgements

The authors would like to acknowledge the financial support from National Natural Science Foundation of China (51774118, 51434003), the Chinese Ministry of Education Innovation Team Development Plan (IRT_16R22), the State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining & Technology (SKLGDUEK1814), the Key Scientific Research Projects of Henan Provincial Education Department (18A620001) and the Science Research Funds for the Universities of Henan Province (J2018-1).

Compliance with Ethical Standards

Conflict of interest

The authors declare that there is no conflict of interest.

References

  1. Argandoña VGR, Rey AR, Celorio C, Suárezdel Río LM, Calleja L, Llavona J (1999) Characterization by computed X-ray tomography of the evolution of the pore structure of a dolomite rock during freeze-thaw cyclic tests. Phys Chem Earth Part A 24(7):633–637CrossRefGoogle Scholar
  2. Bhupendra G, Mayank T, Subir SL (2019) Visibility improvement and mass segmentation of mammogram images using quantile separated histogram equalisation with local contrast enhancement. CAAI Trans Intell Technol 4(2):73–79CrossRefGoogle Scholar
  3. Cai YD, Liu DM, Pan ZJ, Yao YB, Li JQ, Qiu YK (2013) Pore structure and its impact on CH4 adsorption capacity and flow capability of bituminous and subbituminous coals from Northeast China. Fuel 103(1):258–268CrossRefGoogle Scholar
  4. Cai CZ, Li GS, Huang ZW, Shen ZH, Wang HZ, Tian SC, Wei JW (2014) Experiment study of rock porous structure damage under cryogenic nitrogen freezing. Rock Soil Mech 35(4):965–971Google Scholar
  5. Cai CZ, Gao F, Li GS, Huang ZW, Hou P (2016) Evaluation of coal damage and cracking characteristics due to liquid nitrogen cooling on the basis of the energy evolution laws. J Nat Gas Sci Eng 29(2):30–36CrossRefGoogle Scholar
  6. Cha MS, Yin XL, Kneafsey T, Johanson B, Alqahtani N, Miskimins J, Patterson T, Wu YS (2014) Cryogenic fracturing for reservoir stimulation—laboratory studies. J Pet Sci Eng 124(12):436–450CrossRefGoogle Scholar
  7. Cheng WM, Zhang XQ, Zhang R, Wang G (2013) Experimental study on coal pore characteristic based on cryogenic liquid nitrogen method. Appl Mech Mater 341–342:345–350CrossRefGoogle Scholar
  8. Clarkson C, Solano R (2013) Pore structure characterization of North American shale gas reservoirs; using USANS/SANS, gas adsorption, and mercury intrusion. Fuel 103(1):606–616CrossRefGoogle Scholar
  9. Coetzee S, Neomagus HWJP, Bunt JR, Strydom CA, Schobert HH (2014) The transient swelling behavior of large (− 20 +16 mm) South African coal particles during low-temperature devolatilisation. Fuel 136(10):79–88CrossRefGoogle Scholar
  10. Du Y, Sang SX, Wang WF, Liu SQ, Wang T, Fang HH (2018) Experimental study of the reactions of supercritical CO2 and minerals in high-rank coal under formation conditions. Energy Fuels 32(2):1115–1125CrossRefGoogle Scholar
  11. Evans KF, Zappone A, Kraft T, Deichmann N, Moia F (2012) A survey of the induced seismic responses to fluid injection in geothermal and CO2 reservoirs in Europe. Geothermics 41(1):30–54CrossRefGoogle Scholar
  12. Feng B, Barry JC, Bhatia SK (2002) Structural ordering of coal char during heat treatment and its impact on reactivity. Carbon 40(4):481–496CrossRefGoogle Scholar
  13. Fu XH, Qin Y, Wang GX, Rudolph V (2009) Evaluation of coal structure and permeability with the aid of geophysical logging technology. Fuel 88(11):2278–2285CrossRefGoogle Scholar
  14. Giffin S, Littke R, Klaver J, Urai JL (2013) Application of BIB-SEM technology to characterize macropore morphology in coal. Int J Coal Geol 114(7):85–95CrossRefGoogle Scholar
  15. Guo DM, Zhang Y, Li GH (2011) Combination of coal and rock uniaxial compression test image processing of CT. Adv Mater Res 368–373:1374–1378Google Scholar
  16. Guo XQ, Liu DM, Yao YB, Cai YD, Li JQ (2013) Influence of pressure on application of mercury injection capillary pressure for determining coal compressibility. Appl Mech Mater 295–298:2726–2731CrossRefGoogle Scholar
  17. Iñigo AC, Vicente MA, Rives V (2000) Weathering and decay of granitic rocks: its relation to their pore network. Mech Mater 32(9):555–560CrossRefGoogle Scholar
  18. Jarzyna JA, Bala M, Mortimer Z, Puskarczyk E (2013) Reservoir parameter classification of a Miocene formation using a fractal approach to well logging, porosimetry and nuclear magnetic resonance. Geophys Prospect 61(5):1006–1021CrossRefGoogle Scholar
  19. Javadpour F, McClure M, Naraghi ME (2015) Slip-corrected liquid permeability and its effect on hydraulic fracturing and fluid loss in shale. Fuel 160(11):549–559CrossRefGoogle Scholar
  20. Karacan CO, Okandan E (2001) Adsorption and gas transport in coal microstructure: investigation and evaluation by quantitative X-ray CT imaging. Fuel 80(4):509–520CrossRefGoogle Scholar
  21. Kelemen SR, Kwiatek LM (2009) Physical properties of selected block argonne premium bituminous coal related to CO2, CH4, and N2 adsorption. Int J Coal Geol 77(1–2):2–9CrossRefGoogle Scholar
  22. Kim SG, Lee SJ (2012) Tomographic analysis of porosity variation in gas diffusion layer under freeze–thaw cycles. Int J Hydrogen Energy 37(1):566–574CrossRefGoogle Scholar
  23. Lee C, Walter M (2007) Gas diffusion layer durability under steady-state and freezing conditions. J Power Sour 164(1):141–153CrossRefGoogle Scholar
  24. Li XL, Wang EY, Li ZH (2016a) Rock burst monitoring by integrated microseismic and electromagnetic radiation methods. Rock Mech Rock Eng 49(11):4393–4406CrossRefGoogle Scholar
  25. Li ZF, Xu HF, Zhang CY (2016b) Liquid nitrogen gasification fracturing technology for shale gas development. J Pet Sci Eng 138(2):253–256CrossRefGoogle Scholar
  26. Li XL, Li ZH, Wang EY (2018) Pattern recognition of mine microseismic (MS) and blasting events based on wave fractal features. Fractals 26(3):1850029CrossRefGoogle Scholar
  27. Liu L, Cao Y, Liu Q (2015) Kinetics studies and structure characteristics of coal char under pressurized CO2, gasification conditions. Fuel 146(4):103–110CrossRefGoogle Scholar
  28. Liu SM, Li XL, Wang, DK, Wu MY, Yin GZ, Li MH (2019) Mechanical and acoustic emission characteristics of coal at temperature impact. Nat Res Res.  https://doi.org/10.1007/s11053-019-09562-w CrossRefGoogle Scholar
  29. Luo J (2011) High-temperature mechanical properties of mudstone in the process of underground coal gasification. Rock Mech Rock Eng 44(6):749–754CrossRefGoogle Scholar
  30. Mcdaniel BW, Grundmann SR, Kendrick WD (1997) Field applications of cryogenic nitrogen as a hydraulic fracturing fluid. J Pet Technol 50(3):561–572Google Scholar
  31. Mitra A, Harpalani S, Liu SM (2012) Laboratory measurement and modeling of coal permeability with continued methane production: part 1-Laboratory results. Fuel 94(1):110–116CrossRefGoogle Scholar
  32. Moukhtari FE, Lecampion B (2018) A semi-infinite hydraulic fracture driven by a shear-thinning fluid. J Fluid Mech 838(2):573–605CrossRefGoogle Scholar
  33. Najafi M, Jalali SME, Khalokakaie R (2014) Thermal–mechanical–numerical analysis of stress distribution in the vicinity of underground coal gasification (UCG) panels. Int J Coal Geol 134–135:1–16CrossRefGoogle Scholar
  34. Nasihatgozar M (2019) Analysis of buckling in concrete beams containing nanoparticles utilising numerical approach. Int J Hydromechatron 2(2):179–187Google Scholar
  35. Nishizawa T, Koyanagawa M, Takeuchi Y, Kubo K, Yoshimoto T (2016) A thermal stress calculation method of concrete pavement based on temperature prediction and fem analysis. J Jpn Soc Civ Eng Ser E1 (Pavement Engineering) 72(3):I_105–I_113CrossRefGoogle Scholar
  36. Puller JW, Mills KW, Jeffrey RG, Walker RJ (2016) In-situ stress measurements and stress change monitoring to monitor overburden caving behaviour and hydraulic fracture pre-conditioning. Int J Min Sci Technol 26(1):103–110CrossRefGoogle Scholar
  37. Qian C, Fang YC (2018) Adaptive tracking control of flapping wing micro-air vehicles with averaging theory. CAAI Trans Intell Technol 3(1):18–27CrossRefGoogle Scholar
  38. Qin L, Zhai C, Liu SM, Xu J (2017) Changes in the petrophysical properties of coal subjected to liquid nitrogen freeze–thaw—a nuclear magnetic resonance investigation. Fuel 194(15):102–114CrossRefGoogle Scholar
  39. Raminnea M (2019) Frequency analysis in sandwich higher order plates imposing various boundary conditions. Int J Hydromechatron 2(1):63–76CrossRefGoogle Scholar
  40. Shang DL, Yin GZ, Zhao Y, Deng BZ, Liu C, Kang XT, Lu J, Li MH (2018) Local asymmetric fracturing to construct complex fracture network in tight porous reservoirs during subsurface coal mining: an experimental study. J Nat Gas Sci Eng 59(11):343–353CrossRefGoogle Scholar
  41. Sun WJ, Feng YY, Jiang CF, Wei C (2015) Fractal characterization and methane adsorption features of coal particles taken from shallow and deep coalmine layers. Fuel 155(9):7–13CrossRefGoogle Scholar
  42. Taske K (2000) An investigation into the pore size distribution of coal using mercury porosimetry and the effect that stress has on this distribution. The University of Queensland, QueenslandGoogle Scholar
  43. Wang XL, Yan SX, Wen HQ (2013a) Experimental analysis on microstructure and mineral composition of jurassic soft rock in shajihai mining area of xinjiang. Appl Mech Mater 353(8):24–27Google Scholar
  44. Wang L, Wang X, Li J, Cha MS (2013b) Simulation of pressure transient behavior for asymmetrically finite-conductivity fractured wells in coal reservoirs. Transp Porous Media 97(3):353–372CrossRefGoogle Scholar
  45. Wang DK, Wei JP, Fu QC, Liu Y, Xia YL (2015) Seepage law and permeability calculation of coal gas based on Klinkenberg effect. J Cent South Univ 22(5):1973–1978CrossRefGoogle Scholar
  46. Wang L, Yao BW, Cha M et al (2016) Waterless fracturing technologies for unconventional reservoirs-opportunities for liquid nitrogen. J Nat Gas Sci Eng 35(9):160–174CrossRefGoogle Scholar
  47. Wang DK, Yao BH, Gao YN, Li WR, Lv RH (2017) Effect of cyclic temperature impact on coal seam permeability. Therm Sci 21(S1):351–357CrossRefGoogle Scholar
  48. Wang DK, Zhang P, Pu H, Wei JP, Liu SM, Yu C, Sun LT (2018) Experimental research on cracking process of coal under temperature variation with industrial micro-CT. Chin J Rock Mech Eng 37(10):2243–2252Google Scholar
  49. Wu XG, Huang ZW, Zhang SK, Cheng Z, Li R, Song HY, Wen HT, Huang PP (2019) Damage analysis of high-temperature rocks subjected to LN2 thermal shock. Rock Mech Rock Eng.  https://doi.org/10.1007/s00603-018-1711-y CrossRefGoogle Scholar
  50. Xu XQ, Wang YG, Chen ZD, Bai L, Zhang KJ, Yang SS, Zhang S (2015) Influence of cooling treatments on char microstructure and reactivity of Shengli brown coal. J Fuel Chem Technol 43(1):1–8CrossRefGoogle Scholar
  51. Xu HN, Li HZ, Tan YQ, Wang LB, Hou Y (2018) A micro-scale investigation on the behaviors of asphalt mixtures under freeze-thaw cycles using entropy theory and a computerized tomography scanning technique. Entropy 20(2):68–80CrossRefGoogle Scholar
  52. Yao YB, Liu DM (2012) Comparison of low-field NMR and mercury intrusion porosimetry in characterizing pore size distributions of coals. Fuel 95(1):152–158CrossRefGoogle Scholar
  53. Yao YB, Liu DM, Huang WH (2011) Influences of igneous intrusions on coal rank, coal quality and adsorption capacity in hongyang, handan and huaibei coalfields, North China. Int J Coal Geol 88(2):135–146CrossRefGoogle Scholar
  54. Yin GZ, Li MH, Wang JG, Xu J, Li WP (2015) Mechanical behavior and permeability evolution of gas infiltrated coals during protective layer mining. Int J Rock Mech Min Sci 80(12):292–301CrossRefGoogle Scholar
  55. Yin GZ, Shang DL, Li MH, Huang J, Gong TC, Song ZL, Deng BZ, Liu C, Xie ZC (2017) Permeability evolution and mesoscopic cracking behaviors of liquid nitrogen cryogenic freeze fracturing in low permeable and heterogeneous coal. Powder Technol 325(2):234–246Google Scholar
  56. Zhai C, Qin L, Liu SM, Xu JZ, Tang ZQ, Wu SL (2016) Pore structure in coal: pore evolution after cryogenic freezing with cyclic liquid nitrogen injection and its implication on coalbed methane extraction. Energy Fuels 30(7):6009–6020CrossRefGoogle Scholar
  57. Zhang YH, Zhang ZK, Sarmadivaleh M, Lebedev M, Barifcani A, Yu HY, Lglauer S (2017) Micro-scale fracturing mechanisms in coal induced by adsorption of supercritical CO2. Int J Coal Geol 175(4):40–50CrossRefGoogle Scholar
  58. Zhou B, Zhou H, Wang JY, Cen K (2015) Effect of temperature on the sintering behavior of Zhundong coal ash in oxy-fuel combustion atmosphere. Fuel 150(6):526–537CrossRefGoogle Scholar
  59. Zhou SD, Liu DM, Cai YD, Yao YB (2016) Fractal characterization of pore–fracture in low-rank coals using a low-field NMR relaxation method. Fuel 181(10):218–226CrossRefGoogle Scholar

Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Coal Mine Disaster Dynamics and Control, College of Resource and Safety EngineeringChongqing UniversityChongqingChina
  2. 2.State Key Laboratory Cultivation Base for Gas Geology and Gas Control, School of Safety EngineeringHenan Polytechnic UniversityJiaozuoChina
  3. 3.State Key Laboratory for GeoMechanics and Deep Underground EngineeringChina University of Mining and TechnologyXuzhouChina

Personalised recommendations