1887

Abstract

Summary

This paper presents a tool for first-order evaluation of fracture/fault reactivation due to fluid injection. It also provides frictional strength parameters of a shale from direct shear testing. The in-house tool, FracStress, was developed based on the analytical Mohr-Coulomb failure criteria and 3D transformation of in-situ stress conditions. The software accounts for the geometry of fracture/fault, 3D stress field, pore pressure and frictional properties. It calculates and visualizes the state of stress for any given fracture orientation. Friction and cohesion of a pre-fractured shale is determined through a direct shear test. The state of stress and frictional strength envelope of material are plotted to estimate the critical injection pressure for the material. The developed tool was tested using the stress condition and test results of Draupne shale in the Ling Depression, the North Sea. The analysis shows that for stress conditions present at the depth of 2582 m, Ling Depression, fractures dipping 60° are close to failure condition. However, fractures dipping 30° and 45° will sustain injection pressure of between 2 to 9 MPa depending on the state of horizontal stresses in the area and the friction coefficient of material.

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/content/papers/10.3997/2214-4609.201902323
2019-09-08
2020-07-07
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References

  1. Day, J.J., Diederichs, M.S. and Hutchinson, D.J.
    [2017] New direct shear testing protocols and analyses for fractures and healed intrablock rock mass discontinuities. Engineering Geol.229, 53–72.
    [Google Scholar]
  2. Giger, S.B., Clennell, M.B., Ciftci, N.B., Harbers, C., Clark, P. and Ricchetti, M.
    [2013] Fault transmissibility in elastic-argillaceous sequences controlled by clay smear evolution. The American AAPG Bulletin97(5), 705–731.
    [Google Scholar]
  3. Gutierrez, M. Øino, L.E. and Nygård, R.
    [2000] Stress-dependent permeability of a de-mineralised fracture in shale. Marine and Petroleum Geology17(8), 895–907.
    [Google Scholar]
  4. Hangx, S.J.T., Spiers, J.C., Peach, C.J.
    [2010] Mechanical behavior of anhydrite caprock and implications for CO2 sealing capacity, J. Geophys. Res.115(B7), B07402.
    [Google Scholar]
  5. Hillis, R.R. and Nelson, E.J.
    [2002] In situ stresses in the North Sea and their applications: petroleum geomechanics from exploration to development. In: Dore, A.G. & Vining, B.A. (eds.) Petroleum Geology: North-West Europe and Global Perspectives—Proceedings of the 6th Petroleum Geology Conference,551–564.
    [Google Scholar]
  6. Mehrishal, SA., Sharifzadeh, M., Shahriar, K. and Song, J.J.
    [2017] Shear Model Development of Limestone Joints with Incorporating Variations of Basic Friction Coefficient and Roughness Components During Shearing. Rock Mech Rock Eng.50, 825–855.
    [Google Scholar]
  7. Pluymakers, A.M.H.
    [2015] Frictional and sealing behavior of simulated anhydrite fault gouge: Effects of CO2 and implications for fault stability and caprock integrity. PhD dissertation,Department of Earth Sciences, Utrecht University, The Netherlands.
    [Google Scholar]
  8. Sharifzadeh, M. Mitani, Y. and Esaki, T.
    [2008] Rock Joint Surfaces Measurement and Analysis of Aperture Distribution under Different Normal and Shear Loading using GIS. Rock Mech. Rock Engng.41(2), 299–323.
    [Google Scholar]
  9. Wiprut, D. and Zoback, M.
    [2002] Fault reactivation, leakage potential, and hydrocarbon column heights in the northern North Sea. In: Koestler AG, Hunsdale R (eds.), Hydrocarbon Seal Quantification. NPF Special Publication 11,203–219, Accessed (23 December 2018) at https://doi.org/10.1016/S0928-8937(02)80016-9.
    [Google Scholar]
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