AI Chat Paper
Discover the SciOpen Platform and Achieve Your Research Goals with Ease.
Search articles, authors, keywords, DOl and etc.
{{expandStatus?'Exit ':''}}Advanced Search
Radial borehole fracturing that combines radial boreholes with hydraulic fracturing is anticipated to improve the output of tight oil and gas reservoirs. This paper aims to investigate fracture propagation and pressure characteristics of radial borehole fracturing in multiple layers. A series of laboratory experiments with artificial rock samples (395 mm × 395 mm × 395 mm) was conducted using a true triaxial fracturing device. Three crucial factors corresponding to the vertical distance of adjacent radial borehole layers (vertical distance), the azimuth and diameter of the radial borehole are examined. Experimental results show that radial borehole fracturing in multiple layers generates diverse fracture geometries. Four types of fractures are identified based on the connectivity between hydraulic fractures and radial boreholes. The vertical distance significantly influences fracture propagation perpendicular to the radial borehole axis. An increase in the vertical distance impedes fracture connection across multiple radial borehole layers and reduces the fracture propagation distance along the radial borehole axis. The azimuth also influences fracture propagation along the radial borehole axis. Increasing the azimuth reduces the guiding ability of radial boreholes, which makes the fracture quickly curve to the maximum horizontal stress direction. The breakdown pressure correlates with diverse fracture geometries observed. When the fractures connect multi-layer radial boreholes, increasing the vertical distance decreases the breakdown pressure. Decreasing the azimuth and increasing the diameter also decrease the breakdown pressure. The extrusion force exists between the adjacent fractures generated in radial boreholes in multiple rows, which plays a crucial role in enhancing the guiding ability of radial boreholes and results in higher breakdown pressure. The research provides valuable theoretical insights for the field application of radial borehole fracturing technology in tight oil and gas reservoirs.
Bai, Y., Liu, S.Q., Xia, Z.H., et al., 2021. Fracture initiation mechanisms of multibranched radial-drilling fracturing. Lithosphere. https://doi.org/10.2113/2021/3316083.
Fineberg, J., Gross, S.P., Marder, M., et al., 1992. Instability in the propagation of fast cracks. Phys. Rev. B 45 (10), 5146. https://doi.org/10.1103/PhysRevB.45.5146.
Fu, X., Li, G.S., Huang, Z.W., et al., 2015. Experimental and numerical study of radial lateral fracturing for coalbed methane. J. Geophys. Eng. 12 (5), 875–886. https://doi.org/10.1088/1742-2132/12/5/875.
Gong, D.G., Qu, Z.Q., Guo, T.K., et al., 2016. Variation rules of fracture initiation pressure and fracture starting point of hydraulic fracture in radial well. J. Petrol. Sci. Eng. 140, 41–56. https://doi.org/10.1016/j.petrol.2016.01.006.
Guo, T.K., Gong, F.C., Shen, L., et al., 2019. Multi-fractured stimulation technique of hydraulic fracturing assisted by radial slim holes. J. Petrol. Sci. Eng. 174, 572–583. https://doi.org/10.1016/j.petrol.2018.11.064.
Guo, T.K., Liu, B.Y., Qu, Z.Q., et al., 2017. Study on initiation mechanisms of hydraulic fracture guided by vertical multi-radial boreholes. Rock Mech. Rock Eng. 50 (7), 1767–1785. https://doi.org/10.1007/s00603-017-1205-3.
Guo, T.K., Qu, Z.Q., Gong, D.G., et al., 2016. Numerical simulation of directional propagation of hydraulic fracture guided by vertical multi-radial boreholes. J. Nat. Gas Sci. Eng. 35, 175–188. https://doi.org/10.1016/j.jngse.2016.08.056.
Guo, T.K., Qu, Z.Q., Gong, F.C., et al., 2017. Numerical simulation of hydraulic fracture propagation guided by single radial boreholes. Energies 10 (10), 1680. https://doi.org/10.3390/en10101680.
Guo, Z.Q., Tian, S.C., Liu, Q.L., et al., 2022. Experimental investigation on the breakdown pressure and fracture propagation of radial borehole fracturing. J. Petrol. Sci. Eng. 208, 109169. https://doi.org/10.1016/j.petrol.2021.109169.
Huang, Z., Huang, Z.W., Su, Y.A., et al., 2020. A feasible method for the trajectory measurement of radial jet drilling laterals. SPE Drill. Complet. 35 (1), 125–135. https://doi.org/10.2118/192140-PA.
Huang, Z., Huang, Z.W., Wu, L., et al., 2020. Trajectory measurement of radial jet drilling wells: improved tool and data processing. J. Energy Resour. Technol. 142 (3), 032902. https://doi.org/10.1115/1.4044622.
Hubbert, M.K., Willis, D.G., 1957. Mechanics of hydraulic fracturing. Transac. AIME 210, 153–168. https://doi.org/10.2118/686-G.
Liu, Q.L., Tian, S.C., 2020. 3D numerical modeling of fracture initiation from branch wellbore. Energy Sources Part A 1–20. https://doi.org/10.1080/15567036.2020.1795316.
Liu, Q.L., Tian, S.C., Li, G.S., et al., 2018a. An analytical model for fracture initiation from radial lateral borehole. J. Petrol. Sci. Eng. 164, 206–218. https://doi.org/10.1016/j.petrol.2018.01.056.
Liu, X.Q., Qu, Z.Q., Guo, T.K., et al., 2019. An innovative technology of directional propagation of hydraulic fracture guided by radial holes in fossil hydrogen energy development. Int. J. Hydrogen Energy 44 (11), 5286–5302. https://doi.org/10.1016/j.ijhydene.2018.07.189.
Raheem, A.A., Soyingbe, A.A., Emenike, A.J., 2013. Effect of curing methods on density and compressive strength of concrete. Int. J. Appl. Sci. Technol. 3 (4).
Sesetty, V., Ghassemi, A., 2015. A numerical study of sequential and simultaneous hydraulic fracturing in single and multi-lateral horizontal wells. J. Petrol. Sci. Eng. 132, 65–76. https://doi.org/10.1016/j.petrol.2015.04.020.
Sun, L.D., Fang, C.L., Li, F., et al., 2010. Petroleum exploration and development practices of sedimentary basins in China and research progress of sedimentology. Petrol. Explor. Dev. 37 (4), 385–396. https://doi.org/10.1016/S1876-3804(10)60040-7.
Sun, L.D., Zou, C.N., Jia, A.L., et al., 2019. Development characteristics and orientation of tight oil and gas in China. Petrol. Explor. Dev. 46 (6), 1073–1087. https://doi.org/10.1016/S1876-3804(19)60264-8.
Tian, Y., Qu, Z.Q., Guo, T.K., et al., 2017. Theoretical research on radial wells orientating hydraulically created fracture directional extended. Int. J. Hydrogen Energy 42 (29), 18358–18363. https://doi.org/10.1016/j.ijhydene.2017.04.179.
Wu, G., 2012. Process study on radial drilling technology to exploit CBM in Qinshui basin. China Coal 38 (1), 9–12 (in Chinese).
Wu, K., Olson, J.E., 2015. Simultaneous multifracture treatments: fully coupled fluid flow and fracture mechanics for horizontal wells. SPE J. 20 (2), 337–346. https://doi.org/10.2118/167626-PA.
Xian, B.A., Xia, B.R., Zhang, Y., et al., 2010. Technical analysis on radial horizontal well for development of coalbed methane of low coal rank. Coal Geol. Explor. 38 (4), 25–29 (in Chinese).
Zou, C.N., Yang, Z., He, D.B., et al., 2018. Theory, technology and prospects of conventional and unconventional natural gas. Petrol. Explor. Dev. 45 (4), 604–618. https://doi.org/10.1016/S1876-3804(18)30066-1.
This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
京公网安备11010802044758号