Abstract
To investigate the differences of mechanical behaviour and pore evolution characteristics of new solidified borehole-sealing materials, traditional triaxial compression tests, Brazilian splitting test and nuclear magnetic resonance test were conducted to analyse the deformation, strength characteristics and pore evolution characteristics of three types of sealing materials under different confining pressures. The results are as follows: the improvement of elastic modulus and deformation modulus of borehole-sealing materials under the influence of confining pressure is proportional to the elastic modulus and deformation modulus at a low confining pressure. There is little difference in the cohesion among the three types of sealing materials and the differences in the strength thereof are caused by the difference in the internal friction angle. The influence coefficients of confining pressure show a negative exponential decreasing trend with increasing confining pressure. When the confining pressure is 3 MPa, turning points appear in the plot of confining pressure coefficient versus confining pressure. The ratio of tensile strength to uniaxial compressive strength of the sealing material is between 9.2 and 15.2%. The T2 spectra of the internal pore-fracture system of the three types of borehole-sealing materials all exhibit a three-peak distribution, in which the proportion of adsorption pores is the highest, and the proportion of seepage pores and fractures is relatively small. Under different confining pressures, the stress sensitivity of different pore structure types in the new solidified sealing material is all lower than that of traditional sealing materials and cement mortar. This study on mechanical behaviour and pore evolution of those samples was conducted to facilitate the knowledge of different sealing material performance, and to deliver practical meanings on the progress and development of borehole-sealing technology.
Similar content being viewed by others
References
Borgia GC, Bortolotti V, Dattilo P, Fantazzini P, Maddinelli G (1996) Quantitative determination of porosity: a local assessment by NMR imaging techniques. Magn Reson Imaging 14(7–8):919–921. https://doi.org/10.1016/S0730-725X(96)00182-8
Cai MF, He MC, Liu DY (2002) Rock mechanics and engineering. Science Press, Beijing
Cao ZY, Wang EY, He XQ, Wang H, Liu QL, Zhang GH, Luo F, Wang C, Xu YL (2021) Effect evaluation of pressure relief and gas drainage of hydraulic punching in short-distance coal seam group with the risk of out-burst. J Min Saf Eng 38(3):634–642. https://doi.org/10.13545/j.cnki.jmse.2020.0206
Cheng YP, Dong J, Li W, Chen MY, Liu K (2017) Effect of negative pressure on coalbed methane extraction and application in the utilization of methane resource. J China Coal Soc 42(6):1466–1474. https://doi.org/10.13225/j.cnki.jccs.2016.1270
Cheng ZL, Sui WB, Ning ZF, Gao YF, Hou YN, Chang CH, Li JJ (2018) Microstructure characteristics and its effects on mechanical properties of digital core. Chin J Rock Mech Eng 37(2):449–460. https://doi.org/10.13722/j.cnki.jrme.2017.1122
Dou HE, Zhang HJ, Yao SL, Zhu D, Sun T, Ma SY, Wang XL (2016) Measurement and evaluation of the stress sensitivity in tight res-ervoirs. Pet Explor Dev 43(6):1022–1028
Gao W, Yi TS, Jin J, Yang TB, Zhao LY, Wang R, Zhou XZ (2017) Pore integrated fractal characteristics of coal sample in western Guizhou and its impact to porosity and permeability. J China Coal Soc 42(5):1258–1265. https://doi.org/10.13225/j.cnki.jccs.2016.0869
Huang BX, Zhao XL, Zhang Q (2016) Framework of the theory and technology for simultaneous mining of coal and its associated resources. J China Univ Min Technol 45(4):653–662. https://doi.org/10.13247/j.cnki.jcumt.000499
Jia HL, Ding S, Zi F, Dong YH (2020) Evolution in sandstone pore structures with freeze-thaw cycling and interpretation of damage mechanisms in saturated porous rocks. CATENA 195:104915. https://doi.org/10.1016/j.catena.2020.104915
Li SG, Zhang JF, Zhang C, Lin HF, Yang HJ (2018) Experimental study on expansion mechanism and key influencing factors of new CF sealing materials. J Min Saf Eng 35(2):415–421. https://doi.org/10.13545/j.cnki.jmse.2018.02.026
Li Y, Zhang YG, Zhang L, Hou JL (2019) Characterization on pore structure tectonic coals based on the method mercury intrusion, carbon dioxide adsorption and nitrogen adsorption. J China Coal Soc 44(4):1188–1196. https://doi.org/10.13225/j.cnki.jccs.2018.1494
Liu SL, Zhu CJ, Lin BQ, Liu T (2020) The effect of spatial distribution mode of hydraulic slotting on pressure relief and permeability enhancement of the coal seam. J Min Saf Eng 37(5):983–990. https://doi.org/10.13545/j.cnki.jmse.2020.05.015
Lu YY, Chai CJ, Zhou Z, Ge ZL, Yang MM (2021) Influence of bioconversion on pore permeability of coal seams. J Min Saf Eng 38(1):165–172. https://doi.org/10.13545/j.cnki.jmse.2019.0552
Pape H, Arnold J, Pechnig R, Clauser C, Talnishnikh E, Anferova S, Blümich B (2009) Permeability prediction for low porosity rocks by mobile NMR. Pure Appl Geophys 166(5–7):1125–1163. https://doi.org/10.1007/s00024-009-0481-6
Qian M (2010) On sustainable coal mining in China [J]. Scientific mining of coal. Journal of China coal society 35(4):529–534. https://doi.org/10.13225/j.cnki.jccs.2010.04.007
Qian MG, Xu JL, Wang JC (2018) Further on the sustainable mining of coal. J China Coal Soc 43(1):1–13. https://doi.org/10.13225/j.cnki.jccs.2017.4400
Shi JW, Han K, Fan YW, Zhang R, Wang L (2017) Gas drainage reinforcement mechanism of hydraulic flushing and it’s application in Sijiazhuang. Coal Mine Coal Mine Safety 48(8):109–112. https://doi.org/10.13347/j.cnki.mkaq.2017.08.031
Sun LH, Ji HG, Yang BS (2019) Physical and mechanical characteristic of rocks with weakly cementedstrata in Western representative mining area. J China Coal Soc 44(3):866–874. https://doi.org/10.13225/j.cnki.jccs.2018.6039
Wang HL, Fan PX, Wang MY, Li WP, Qian YH (2011) Influence of strain rate on progressive failure process and characteristic stresses of red sandstone. Rock and Soil Mechanics 32(5):1340–1346. https://doi.org/10.16285/j.rsm.2011.05.008
Wang R, Mair RW, Rosen MS, Cory DG, Walsworth RL (2004) Simultaneous measurement of rock permeability and effective porosity using laser-polarized noble gas NMR. Phys Rev E 70:026312. https://doi.org/10.1103/PhysRevE.70.026312
Xiao K, Zhang ZT, Zhang R, Gao MZ, Xie J, Zhang AL, Liu Y (2021) Anisotropy of the effective porosity and stress sensitivity of coal permeability considering natural fractures. Energy Rep 7(2021):3898–3910. https://doi.org/10.1016/j.egyr.2021.06.067
Yang XL, Yin JH (2006) Linear Mohr-Coulomb strength parameters from the non-linear Hoek-Brown rock masses. Int J Non-Linear Mech 41(8):1000–1005. https://doi.org/10.1016/j.ijnonlinmec.2006.08.003
Yang YM, Ju Y, Chen JL (2014) Distribution properties of stress and cracks propagation behavior of porous rocks during splitting. J China Coal Soc 39(4):658–665. https://doi.org/10.13225/j.cnki.jccs.2013.0513
Yuan L (2017) Scientific conception of coal precision mining. J China Coal Soc 42(1):1–7. https://doi.org/10.13225/j.cnki.jccs.2016.1661
Zhang C, Jin GH, Liu C, Li SG (2020a) Sealing performance of new solidified materials: mechanical properties and stress sensitivity characterization of pores. Adv Polym Technol 2020:1–16. https://doi.org/10.1155/2020/5397697
Zhang JJ, Wei CT, Ju W, Qin ZY (2020b) Microscopic distribution and dynamic variation of water under stress in middle and high rank coal samples. J Nat Gas Sci Eng 79:103369. https://doi.org/10.1016/j.jngse.2020.103369
Zhang JJ, Wei C, Zhao J, Ju W, Chen Y, Tamehe LS (2019a) Comparative evaluation of the compressibility of middle and high rank coals by different experimental methods. Fuel 245:39–51. https://doi.org/10.1016/j.fuel.2019.01.052
Zhang L, Tian MM, Xue JH, Li MX, Zhang C, Lu S (2021) Effect of liquid nitrogen cycle treatment on seepage characteristics of coal samples with different water contents. J China Coal Soc. https://doi.org/10.13225/j.cnki.jccs.xr20.1642
Zhang TJ, Bao RY, Li SG, Zhang C, Zhang L, Jiang XK (2019b) Experimental study on expansion and creep characteristics of new CF sealing material. J Min Saf Eng 36(1):175–183. https://doi.org/10.13545/j.cnki.jmse.2019.01.023
Zhao J (2000) Applicability of Mohr-Coulomb and Hoek-Brown strength criteria to the dynamic strength of brittle rock. Int J Rock Mech Min Sci 37(7):1115–1121. https://doi.org/10.1016/S1365-1609(00)00049-6
Zhou FB, Sun YN, Li HJ, Yu GF (2016) Research on the theoretical model and engineering technology of the coal seam gas drainage hole sealing. J China Univ Min Technol 45(3):433–439. https://doi.org/10.13247/j.cnki.jcumt.000498
Acknowledgements
Based on the requirements of your journal, the language usage has been revised by a native-fluency English-speaker engaged through the auspices of a professional proofreading service. Both revised versions with the necessary Language Revision using MS-Word® “track changes”, and the Language Revision Certificate issued by the proofreading service, are uploaded for your reference.
Funding
Financial support for this work was provided by the National Natural Science Foundation of China (Grants 51974241 and 51734007).
Author information
Authors and Affiliations
Corresponding author
Ethics declarations
Conflict of interest
The authors declare no competing interests.
Additional information
Responsible Editor: Murat Karakus
Rights and permissions
About this article
Cite this article
Chao, Z., Xiangzhen, Z., Bingyou, J. et al. Experimental study on mechanical behaviour and pore evolution of borehole-sealing materials under different confining pressures. Arab J Geosci 15, 310 (2022). https://doi.org/10.1007/s12517-022-09597-z
Received:
Accepted:
Published:
DOI: https://doi.org/10.1007/s12517-022-09597-z