Pages
Download article

Junction zone stability in coaxial wells of different diameters (on the example of the Khanty-Mansi Autonomous District oil field)

A.V. Seryakov, M.Yu. Podberezhny, O.B. Bocharov, M.A. Azamatov

Original article

DOI https://doi.org/10.18599/grs.2020.3.69-78

69-78
rus.

open access

Under a Creative Commons license
The paper considers borehole wall stability in a junction zone of coaxial wells where a borehole of bigger diameter connects with a smaller one. To determine the shapes and character of rock destruction, 3D poroelastic modeling of the stressed state of the rock around the coaxial junction with account for mudcake formation was performed. The geomechanical model considers the anisotropy of the medium’s deformation properties that are characteristic for the coastal-marine reservoirs of Western Siberia. The rock failure is estimated based on the Mohr-Coulomb criterion with account for tensile destruction condition. The paper considers cases of vertical and inclined junctions of a well drilled at a depth of 2 km in sandstone productive pay with known poroelastic anisotropic properties. The stress and pore pressure analysis has been performed for a mud pressure drop range from 1 to 70 atm and coaxial junctions with different combinations of borehole diameters. The safe mud pressure window has been determined for vertical and inclined junctions. It has been found that the rock failure pattern for junction of bigger diameters is, in general, similar to that for smaller diameters with some insignificant differences in the destruction areas shapes. It has also been demonstrated that in vertical junctions, the bottom holes of smaller diameter are more stable to reduced drilling-mud pressure than the mainboreholes, while in the inclined junction it is the mainwellbore that is more stable to increased drilling-mud pressure than the bottom hole.
 
 
3D poroelastic modeling, coaxial junction, vertical and inclined well, anisotropy, rock failure, sandstone reservoir
 
  • Ashikhmin S.G., Kashnikov Yu.A., Shustov D.V., Kukhtinskii A.E. (2018). Influence of elastic and strength anisotropy on the stability of inclined borehole. Neftyanoe khozyaistvo = Oil Industry, 2, pp. 54–57. https://doi.org/10.24887/0028-2448-2018-2-54-57
  • Bocharov O.B., Seryakov A.V. (2016). Modeling uncharacteristic destruction of productive sandstone layers during drilling. Fizicheskaya Mezomekhanika, 19(6), pp. 86–93.
  • Cheng A. H.-D. (1997). Material Coefficients of Anisotropic Poroelasticity. Int. J. Rock Mech. Min. Sci., 34(2), pp. 199–205. https://doi.org/10.1016/S0148-9062(96)00055-1
  • Cui L., Cheng A.H-D., and Y. Abousleiman (1997). Poroelastic Solution for an Inclined Borehole. J. of App. Mechanics ASME, 64(1), pp. 32–38. https://doi.org/10.1115/1.2787291
  • Fadeev A.B. (1987). Finite element method in geomechanics. Moscow: Nedra, 221 p.
  • Geniev G.A., Kurbatov A.S, Samedov F.A. (1993). Issues of strength and ductility of anisotropic materials. Moscow: Interbuk, 187 p.
  • Grogulenko V.V. (2017). Modeling the application of loads on metal-polymer coiled tubing pipes for the oil and gas industry. Naukovedenie, 9(1).
  • Liu C., and Y. Abousleiman (2018). Multiporosity/Multipermeability Inclined-Wellbore Solutions With Mudcake Effects. SPE Journal, 23(5), pp. 1723–1747. https://doi.org/10.2118/191135-PA
  • Mohamad-Hussein A. and J. Heiland (2018). 3D finite element modelling of multilateral junction wellbore stability. J. Pet. Sci., 15, pp. 801–814. https://doi.org/10.1007/s12182-018-0251-0
  • Podberezhny M., Polushkin S. and Makarov A. (2017). Novel Approach for Evaluation of Petrpphysical Parameters from Time-Lapse Induction Logging-While-Drilling Measurements in Deviated and Horizontal Wells. Proceedings of the SPE Russian Petroleum Technology Conference. Moscow. https://doi.org/10.2118/187911-RU
  • Rudyak V.Ya., Seryakov A.V., Manakov A.V. (2013). Joint modeling of geomechanics and filtration processes in the near-wellbore zone while drilling. Proc. Conf.: Geodynamics and the stress state of the Earth’s interior. Novosibirsk: IGD SO RAN, v.1, pp. 383–388.
  • Seryakov A.V, Podberezhnyi M.Yu., Bocharov O.B. (2018). Formation anisotropy as a key factor in well stability in the West Salym field. Proceedings of the 8th International Geological and Geophysical Conference EAGE: Innovations in Geoscience – Time for Breakthrough. St. Petersburg.
  • Zoback M.D. (2010). Reservoir Geomechanics. Cambridge University Press, 449 p.
  •  
Alexander V. Seryakov
Novosibirsk Technology Center, Baker Hughes
4A Kutateladze st., Novosibirsk, 630090, Russian Federation
 
Maxim Yu. Podberezhny
Gazpromneft-GEO
22A Sinopskaya emb., St. Petersburg, 191167, Russian Federation
 
Oleg B. Bocharov
Novosibirsk Technology Center, Baker Hughes
4A Kutateladze st., Novosibirsk, 630090, Russian Federation
 
Marat A. Azamatov
Salym Petroleum Development N.V.
31 Novinsky boul., Moscow, 123242, Russian Federation
 

For citation:

Seryakov A.V., Podberezhny M.Yu., Bocharov O.B., Azamatov M.A. (2020). Junction zone stability in coaxial wells of different diameters (on the example of the Khanty-Mansi Autonomous District oil field). Georesursy = Georesources, 22(3), pp. 69–78. DOI: https://doi.org/10.18599/grs.2020.3.69-78