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ANALYSIS OF ROCK CRACKING CHARACTERISTICS DURING PYROLYSIS DRILLING

ABSTRACT
Thermal jet rock breaking technology refers to the use of high temperature medium such as supercritical water for a rapid local heating of rocks to break the rocks. Because of the low thermal conductivity of the rock matrix, thermal stress will only form on the rock surface. When the temperature stress exceeds the strength of the rock, micro-cracks will appear in the rock, and continue to expand, resulting in the thermal cracking on the rock surface, which will cause the rock surface to fall off from the body and break the rock. Based on thermal-solid coupling theory, a pyrolysis drilling model was established, and the distribution law of temperature field and temperature stress of bottom hole rock during pyrolysis was obtained by using a finite element method. The results show that during the pyrolysis drilling process, the temperature of the heated part of the rock increases rapidly, producing temperature gradients in radial and axial directions. The expansion of the heated volume is affected by compressive stress in the radial direction, buckling in the axial direction and shear stress. This is very important to the field application of pyrolysis drilling.
KEYWORDS
PAPER SUBMITTED: 2020-06-29
PAPER REVISED: 2020-09-07
PAPER ACCEPTED: 2020-09-28
PUBLISHED ONLINE: 2020-10-31
DOI REFERENCE: https://doi.org/10.2298/TSCI200629322W
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2021, VOLUME 25, ISSUE Issue 5, PAGES [3377 - 3397]
REFERENCES
  1. Simon, R. Comparing the Rotary with Potential Drilling Methods. Journal of Petroleum Technology 10.11 (1958) , pp. 28-30
  2. Rajnauth J., Is It Time to Focus on Unconventional Resources. Advances in Petroleum Exploration & Development, 4(2012), 2, pp. 37-45
  3. Wang H. et al., Technologies in deep and ultra-deep well drilling: Present status, challenges and future trend in the 13th Five-Year Plan period (2016-2020), Natural Gas Industry, 37(2017), 4, pp. 1-8
  4. Walsh S. C. et al., Grain-Scale Failure in Thermal Spallation Drilling, Office of Scientific & Technical Information Technical Reports, 2012
  5. Tromans, D., Mineral Comminution: Energy Efficiency Considerations, Minerals Engineering, 21(2008),8, pp. 613-620
  6. Schwechten, D, and Milburn, G. H., Experiences in Dry Grinding with High Compression Roller Mills for End Rroduct Quality below 20 Microns , Minerals Engineering, 3(1990), 1, pp. 23-34
  7. Fuerstenau, D. W., and Abouzeid, A. Z. M., The Energy Efficiency of Ball Milling in Comminution, International Journal of Mineral Processing, 67(2002), 1, pp. 161-185
  8. Toifl, M, et al., 3D Numerical Study on Microwave Induced Stresses in Inhomogeneous Hard Rocks. Minerals Engineering, 90(2016), 6, pp. 29-42
  9. Adeniji, A. W., The Applications of Laser Technology in Downhole Operations - A Review. International Petroleum Technology Conference, 2014
  10. Shen, Z. et al., Analysis on new development and development trend of worldwide drilling technology, Journal of China University of Petroleum, 33(2009), 4, pp. 64-70
  11. Holman, B. W., Heat Treatment As An Agent in Rock Breaking, Trans IMM, 26(1926), 219, pp. 382-397
  12. Yates, A., Effect of Heating And Quenching Cornish Tin Ores Before Crushing, Trans IMM, 1918, 28(41), pp. 918-929
  13. Teodoriu, C. and Cheuffa C., A Comprehensive Review of Past and Present Drilling Methods with Application to Deep Geothermal Environment. Proceedings, Thirty-Sixth Workshop on Geothermal Reservoir Engineering Stanford University, 2011
  14. Tester, J. W., et al., Prospects for Universal Geothermal Energy from Heat Mining, Science & Global Security, 5(1994), 1, pp. 99-121
  15. Calaman, J. J., and Rolseth H C., Technical Advances Expand Use of Jet-Piercing Process in Taconite Industry, American Rock Mechanics Association., New York, USA, 1962
  16. Sheppard, M. C., et al., Designing Well Paths to Reduce Drag and Torque, SPE Drilling Engineering, 2(1987), 4, pp. 344-350
  17. Potter, R., et al., Laboratory Study and Field Demonstration of Hydrothermal Spallation Drilling, GRC Transactions, 34(2010), 52, pp. 249-262
  18. Dey, T. N., et al., Methods for Increasing Drilling Performance of the Thermal Spallation Drilling System, Rock Drilling, 9(1985), 8, pp. 1205-1231.
  19. Browning, J. et al. Recent Advances in Flame Jet Working of Minerals. The 7th Symposium on Rock Mechanics. Pennsylvania, USA, 1965.
  20. Potter, R. M., and Tester, J. W. Continuous Drilling of Vertical Boreholes by Thermal Processes: Including Rock Spallation and Fusion, American Rock Mechanics Association., New York, USA, 1998
  21. Wagner, W. The IAPWS Formulation 1995 for the Thermodynamic Properties of Ordinary Water Substance for General and Scientific Use, Journal of Physical & Chemical Reference Data, 31(2002), 2, pp. 387-435
  22. Dreesen, D., and Bretz, R., Department of Energys National Energy Technology Laboratory. Department of Energys National Energy Technology Laboratory, 2005
  23. Wideman, T. W. et al., Methods and Apparatus for Thermal Drilling. WO. 2012.
  24. Walsh, S. D. C. et al., Size Dependent Spall Aspect Ratio and Its Effects in Thermal Spallation, International Journal of Rock Mechanics & Mining Sciences, 70( 2014), 9, pp. 375-380.
  25. Dreesen, D., and Bretz, R. Coiled-tubing-deployed hard rock thermal spallation cavity maker. Department of Energys National Energy Technology Laboratory, 2005.
  26. Augustine, C. R. Hydrothermal Spallation Drilling and Advanced Energy Conversion Technologies for Engineered Geothermal Systems, Massachusetts Institute of Technology, 109(2009), 4, pp. 49-68.
  27. Rothenfluh, T. Heat Transfer Phenomena of Supercritical Water Jets in Hydrothermal Spallation Drilling, Ph. D. thesis, ETH Zurich, Swit, 2013
  28. Song, X., et al., Numerical Analysis of Characteristics of Multi-Orifice Nozzle Hydrothermal Jet Impact Flow Field and Heat Transfer, Journal of Natural Gas Science & Engineering, 2016, 35, pp. 79-88
  29. Meier, T., et al., Numerical Investigation of Thermal Spallation Drilling Using An Uncoupled Quasi-Static Thermoelastic Finite Element Formulation, Journal of Thermal Stresses, 2016, 39(9), pp. 1138-1151
  30. Koskelainen, L. CONFID-A General Finite Difference Program for Heat Conduction Problems]. Proceedings of The Numerical Methods in Thermal Problems, 1979.
  31. Li, M. et al., Simulation of Thermal Stress Effects in Submerged Continuous Water Jets on the Optimal Standoff Distance during Rock Breaking, Powder Technology, 320 (2017), 123, pp. 47-59
  32. Lu, T. et al., The Thermal Shock Resistance of Solids, Acta Materialia, 46(1998), 13, pp. 4755-4768
  33. Moës, N., et al., A Finite Element Method for Crack Growth without Remeshing, International Journal for Numerical Methods in Engineering, 46(1999), 1, pp. 131-150
  34. Duflot, M., The Extended Finite Element Method in Thermoelastic Fracture Mechanics, International Journal for Numerical Methods in Engineering, 74(2010), 5, pp. 827-847
  35. Ai H A, Ahrens T J. Numerical Modeling of Shock‐Induced Damage for Granite under Dynamic Loading. AIP Conference Proceedings. AIP, 845(2006), 1: 1431-1434

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