DOI QR코드

DOI QR Code

Influence of complex geological structure on horizontal well productivity of coalbed methane

  • Qin, Bing (Institute of Mechanics and Engineering, Liaoning Technical University) ;
  • Shi, Zhan-Shan (Institute of Mining, Liaoning Technical University) ;
  • Sun, Wei-Ji (Institute of Mechanics and Engineering, Liaoning Technical University) ;
  • Liang, Bing (Institute of Mechanics and Engineering, Liaoning Technical University) ;
  • Hao, Jian-Feng (Institute of Mining, Liaoning Technical University)
  • 투고 : 2020.06.16
  • 심사 : 2022.02.23
  • 발행 : 2022.04.25

초록

Complex geological conditions have a great influence on the mining of coalbed methane (CBM), which affects the extraction efficiency of CBM. This investigation analyzed the complicated geological conditions in the Liujia CBM block of Fuxin. A geological model of heterogeneities CBM reservoirs was established to study the influence of strike direction of igneous rocks and fault structures on horizontal well layout. Subsequently, the dual-porosity and dual-permeability mathematical model was established, which considers the dynamic changes of porosity and permeability caused by gas adsorption, desorption, pressure change. The results show that the production curve is in good agreement with the actual by considering gas seepage in matrix pores in the model. Complicated geological structures affect the pressure expansion of horizontal wells, especially, the closer to the fault structure, the more significant the effect, the slower the pressure drop, and the smaller the desorption area. When the wellbore extends to the fault, the pressure expansion is blocked by the fault and the productivity is reduced. In the study area, the optimal distance to the fault is 70 m. When the horizontal wellbore is perpendicular to the direction of coal seam igneous rock, the productivity is higher than that of parallel igneous rock, and the horizontal well bore should be perpendicular to the cleat direction. However, the well length is limited due to the dense distribution of igneous rocks in the Liujia CBM block. Therefore, the horizontal well pumping in the study area should be arranged along the direction of igneous rock and parallel plane cleats. It is found that the larger the area surrounded by igneous rock, the more favorable the productivity. In summary, the reasonable layout of horizontal wells should make full use of the advantages of igneous rock, faults and other complex geological conditions to achieve the goal of high and stable production.

키워드

과제정보

The research described in this paper was financially supported by the National Natural Science Foundation of China (No.52004118; No.51874166), Technology of the Department of Education of Liaoning Province (LJ2020QN009; LJ2019QL005), the National Key Research and Development Projects (No.2016YFC0600704).

참고문헌

  1. Bachu, S. and Michael, K. (2003), "Possible controls of hydrogeological and stress regimes on the producibility of coalbed methane in Upper Cretaceous-Tertiary strata of the Alberta basin, Canada", AAPG Bull, 87, 1729-1754. https://doi.org/10.1306/06030302015.
  2. Bustin, R.M. and Clarkson, C.R. (1998), "Geological controls on coalbed methane reservoir capacity and gas content", Int. J. Coal Geology, 38, 3-26. https://doi.org/10.1016/S0166-5162(98)00030.
  3. Chu, Z., Wu, Z., Wang, Z., Weng, L., Liu, Q. and Fan, L. (2022), "Micro-mechanism of brittle creep in saturated sandstone and its mechanical behavior after creep damage", Int. J Rock Mech. Min. Sci., 149, 104994. https://doi.org/10.1016/j.ijrmms.2021.104994.
  4. Clark, K.R. (2011), "The impact of relative permeability on horizontal well type curve analysis in coalbed methane reservoirs", MS. Theses, West Virginia University, Morgantown.
  5. Clarkson, C.R. and Qanbari, F. (2016), "A semi-analytical method for forecasting wells completed in low permeability, undersaturated CBM reservoirs", J. Nat. Gas Sci. Eng., 30, 19-27. https://doi.org/10.1016/j.jngse.2016.01.040.
  6. Dong, F.X., Zhang, P., Sun, W.B., Zhou, S.L. and Kong, L.J. (2021), "Experimental research on the effect of water-rock interaction in filling media of fault structure", Geomech. Eng., 24(5), 471-478. https://doi.org/10.12989/gae.2021.24.5.471.
  7. Gentzis, T. (2009), "Review of mannville coal geomechanical properties: Application to coalbed methane drilling in the central Alberta plains, Canada", Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 32(4), 355-369. https://doi.org/10.1080/15567030802466110.
  8. Hu, B., Sharifzadeh, M., Feng, X., Guo, W.B. and Talebi, R. (2021), "Role of stress, slenderness and foliation on large anisotropic deformations at deep underground excavations", Int. J. Min. Sci. Technol., 31, 577-590. https://doi.org/10.1016/j.ijmst.2021.05.007.
  9. Hungerford, F., Ren, T. and Aziz, N. (2013), "Evolution and application of in-seam drilling for gas drainage', Int. J. Min. Sci. Technol., 23, 543-553. https://doi.org/10.1016/j.ijmst.2013.07.013.
  10. Jackson, R.E. and Reddy, K.J. (2007), "Geochemistry of Coalbed Natural Gas (CBNG) Produced Water in Powder River Basin, Wyoming: Salinity and Sodicity", Water Air & Soil Pollution, 184, 1-449-61. https://doi.org/10.1007/s11270-007-9398-9.
  11. Jiang, T.T., Zhang, J.H., Huang, G., Song, S.X. and Wu, H. (2018), "Experimental study on the mechanical property of coal and its application", Geomech. Eng., 14(1), 9-17. https://doi.org/10.12989/gae.2018.14.1.009.
  12. Kumar, A. (2007), "Methane Diffusion Characteristics of Illinois Coals", MS Thesis, Southern Illinois University, Carbondale.
  13. Li, D.L., Wang, Y.L., Zha, W.S. and Lu, D.T. (2018), "Pressure transient behaviors of hydraulically fractured horizontal shale-gas wells by using dual-porosity and dual-permeability model", J. Petroleum Sci. Eng., 164, 531-545. https://doi.org/10.1016/j.petrol.2018.01.016.
  14. Li, S., Tang, D.Z., Pan, Z.J., Xu, H. and Tao, S. (2018), "Geological conditions of deep coalbed methane in the eastern margin of the Ordos Basin, China: Implications for coalbed methane development", J. Nat. Gas Sci. Eng., 53, 394-402. https://doi.org/10.1016/j.jngse.2018.03.016.
  15. Liang, B., Qin, B. and Chen, T.Y. (2014), "Research on the Effect of Intrusive igneous rock on COAL-BED METHANE horizontal well Productivity", Eng. Mech. Anics., 31(9), 245-251. https://doi.org/10.6052/j.issn.1000-4750.2013.04.0304.
  16. MacDonald, D. (2006), "Australian CSG horizontal drilling-some technical aspects, CBM-Unlocking a Global Resource", SPEATW, Beijing, China, November.
  17. Maricic, N., Mohaghegh, S.D. and Artun, E. (2008), "A parametric study on the benefits of drilling horizontal and multilateral wells in coalbed methane reservoirs", Spe. Reservoir Eval. Eng., 11(6), 976-983. https://doi.org/10.2118/96018-PA.
  18. Palmer, I. and Mansoori, J. (1998), "How permeability depends on stress and pore pressure in coalbeds: A new model", Soc. Petroleum Engineers, 1(6), 557-564. https://doi.org/10.2118/52607-PA.
  19. Pan, J., Wang, H., Wang, K. and Niu, Q. (2014), "Relationship of fractures in coal with lithotype and thickness of coal lithotype", Geomech. Eng., 6(6), 613-624. https://doi.org/10.12989/gae.2014.6.6.613.
  20. Pan, J.N., Zhang X.M., Ju, Y.W. and Zhao, Y.Q. (2013), "Stable isotope and water quality analysis of coal bed methane produced water in the southern Qinshui Basin, China", Membrane Water Treatment, 4(4), 265-275. https://doi.org/10.12989/mwt.2013.4.4.265.
  21. Prabu, V. and Mallick, N. (2015), "Coalbed methane with CO2 sequestration: An emerging clean coal technology in India", Renew. Sust. Energy Rev., 50, 229-244. https://doi.org/10.1016/j.rser.2015.05.010.
  22. Prob, T., Zuleima, T.K. and Turgay, E. (2012), "Development of a multi-mechanistic, dual-porosity, dual-permeability, numerical flow model for coalbed methane reservoirs", J. Nat. Gas Sci. Eng., 8, 121-131. https://doi.org/10.1016/j.jngse.2012.01.004.
  23. Salmachi, A. and Karacan, C.O. (2017), "Cross-formational flow of water into coalbed methane reservoirs: controls on relative permeability curve shape and production profile", Environ. Earth Sci., 76, 200. https://doi.org/10.1007/s12665-017-6505-0.
  24. Sarhosis, V., Jaya, A.A. and Thomas, H.R., (2016), "Economic modellingfor coal bed methane production and electricity generationfrom deep virgin coal seams", Energy, 107, 580-594. https://doi.org/10.1016/j.energy.2016.04.056.
  25. Schatzel, S.J., Karacan, C.O ., Dougherty, H. and Goodman, G.V.R. (2012), "An analysis of reservoir conditions and responses in longwall panel overburden during mining and its effect on gob gas well performance", Eng. Geolog., 127, 65-74. https://doi.org/10.1016/j.enggeo.2012.01.002.
  26. Walter, Jr. and Ayers, B. (2002), "Coalbed gas systems, resources, and production and a review of contrasting cases from the San Juan and powder river basins", Am. Assoc. Petroleum Geologists Bull., 86, 111853-1890.
  27. Whittles, D.N., Lowndes, I.S., Kingman, S.W., Yates, C. and Jobling, S. (2007), "The stability of methane capture boreholes around a long wall coal panel", Int. J. Coal Geolog., 71, 313-328. https://doi.org/10.1016/j.coal.2006.11.004.
  28. Wu, K. and Shao, Z. (2019a), "Study on the effect of flexible layer on support structures of tunnel excavated in viscoelastic rocks", J. Eng. Mech., 145(10), 04019077. https://doi.org/10.1061/(ASCE)EM.1943-7889.0001657.
  29. Wu, K. and Shao, Z. (2019b), "Visco-elastic analysis on the effect of flexible layer on mechanical behavior of tunnels", Int. J. Appl. Mech., 2019, 11(3), 1950027. https://doi.org/10.1142/S1758825119500273.
  30. Wu, K., Shao, Z. and Qin, S. (2020b), "An analytical design method for ductile support structures in squeezing tunnels", Arch. Civil Mech. Eng., 20, 91. https://doi.org/10.1007/s43452-020-00096-0.
  31. Wu, K., Shao, Z., Qin, S., Wei, W. and Chu, Z. (2021b) "A critical review on the performance of yielding supports in squeezing tunnels", Tunn. Undergr. Sp. Tech., 115, 103815. https://doi.org/10.1016/j.tust.2021.103815.
  32. Wu, K., Shao, Z., Qin, S., Zhao, N. and Chu, Z. (2021a), "An improved non-linear creep model for rock applied to tunnel displacement prediction", Int. J. Appl. Mech., 13(8), 2150094. https://doi.org/10.1142/S1758825121500940.
  33. Wu, K., Shao, Z., Qin, S., Zhao, N. and Hu, H. (2020a), "Analytical-based assessment of effect of highly deformable elements on tunnel lining within viscoelastic rocks", Int. J. Appl. Mech., 12(3), 2050030. https://doi.org/10.1142/S1758825120500301.
  34. Wu, K., Shao, Z., Sharifzadeh, M., Chu, Z. and Qin S. (2022a), "Analytical approach to estimating the influence of shotcrete hardening property on tunnel response", J. Eng. Mech., 148(1), 04021127. https://doi.org/10.1061/(ASCE)EM.1943-7889.0002052.
  35. Wu, K., Shao, Z., Sharifzadeh, M., Hong, S. and Qin, S. (2020b), "Analytical computation of support characteristic curve for circumferential yielding lining in tunnel design", J. Rock Mech. Geotech. Eng., 14(1), 144-152. https://doi.org/10.1016/j.jrmge.2021.06.016.
  36. Xu, H., Qin, Y.P., Wu, F., Zhang, F.J., Liu, W., Liu, J. and Guo, M.Y. (2021), 'Numerical modeling of gas extraction from coal seam combined with a dual-porosity model: Finite difference solution and multi-factor analysis', Fuel, 2021, 122687. https://doi.org/10.1016/j.fuel.2021.122687.
  37. Yan, C.L., Ren, X., Cheng, Y.F. and Zhan, K. (2019), "An experimental study on the hydraulic fracturing of radial horizontal wells", Geomech. Eng., 17(6), 535-541. https://doi.org/10.12989/gae.2019.17.6.535.
  38. Yan, J.W., Tan, Z.H., Guo, Y. and Jia, T.R. (2021), "Research on coal bed methane (Gas) occurrence controlled by geological tectonics in the southern margin of North China plate: A case study of the Pingdingshan Coalfield, China", J. Shock Vib., 2021, 17, 6686591. https://doi.org/10.1155/2021/6686591.
  39. Zhao, N., Shao, Z., Wu, K., Chu, Z. and Qin, S. (2021), "Time-dependent solutions for lined circular tunnels considering rockbolts reinforcement and face advancement effects", 21(10), 04021179. https://doi.org/10.1061/(ASCE)GM.1943-5622.0002130.
  40. Zhao, N., Shao. Z., Yuan, B., Chen, X. and Wu, K. (2022) "Analytical approach to the coupled effects of slope angle and seepage on shallow lined tunnel response", Int. J Appl. Mech., 14(2), 2250003. https://doi.org/10.1142/S175882512250003X.