Authors: Zhang, X; Jeffrey, RG

Purchase Paper

Cite As:
Zhang, X & Jeffrey, RG 2008, 'On Intersection and Crossing of Frictional Interfaces by Hydraulic Fractures', in Y Potvin, J Carter, A Dyskin & R Jeffrey (eds), Proceedings of the First Southern Hemisphere International Rock Mechanics Symposium, Australian Centre for Geomechanics, Perth, pp. 347-354.

Download citation as:   ris   bibtex   endnote   text   Zotero


Abstract:
A two-dimensional BEM model has been developed to examine re-initiation or termination of a fluid-driven fracture that intersects an orthogonal frictional interface. The matrix rocks on both sides of the interface are assumed to be impermeable, and a Newtonian fluid is injected into the fracture system at a constant rate. The formation of a new crack is controlled by the critical tensile stress criterion. A fracture approaching and terminating on the interface can induce a horizontal tensile stress in the unfractured layer to facilitate fracture nucleation. As a result of the elevated tensile stress, a hydraulic fracture crossing interfaces between dissimilar layers either forms a step-like trace or propagates straight across. Its continued propagation into the interior of the unfractured layer is assisted by interface frictional sliding and pressurised fluid. Also, a fracture can be arrested by entering and extending along the interface if conditions do not lead to crack nucleation in the unfractured layer and growth of such a new fracture. In the presence of modulus contrasts across the interface, numerical results are presented for the changes in fracture trajectories and injection pressure.

References:
Cooke, M.L. and Underwood, C.A. (2001) Fracture termination and step-over at bedding interfaces due to frictional slip and interface opening, J. Structural Geology, 23, pp. 223–238.
Daneshy, A. (2003) Off-balance growth: A new concept in hydraulic fracturing, J. Petroleum Tech., (April, 2003) 78 p.
Detournay, E. (2004) Propagation regime of fluid-driven fractures in impermeable rocks, Int. J. Geomechanics, 4, pp. 35–45.
Erdogan, F. and Sih, G.C. (1963) On the crack extension in plates under plate loading and transverse shear, J. Basic Engineering, 85, pp. 519–527.
Jeffrey, R.G., Settari, A. and Smith, N.P. (1995) A comparison of hydraulic fracture field experiments, including mineback geometry data, with numerical fracture model simulations, paper SPE 30508 presented at the 1998 SPE Annual Tech. Conf. and Exhib., Dallas, 22–25 October, pp. 591–606.
Jeffrey, R.G., Vlahovic, W., Doyle, R.P. and Wood, J.H. (1998) Propped fracture geometry of three hydraulic fractures in Sydney Basin coal seams, paper SPE 50061 presented at the 1998 SPE Asia Pacific Oil and Gas Conf. and Exhib., Perth, 12–14 October.
Renshaw, C.E. and Pollard, D. (1995) An experimentally verified criterion for propagation across unbonded frictional interfaces in brittle, linear elastic materials, Int. J. Rock Mech. and Geomech. Abstr., 32, pp. 237–249.
Rice, J.R. and Sih, G.C. (1965) Plane problems of cracks in dissimilar materials, J. Appl. Mech., 32, pp. 418–423.
Van As, A. and Jeffrey, R.G. (2000) Caving induced by hydraulic fracturing at Northparkes Mines, In: J. Girard, M. Liebman, C. Breeds, and Doe, T (eds.), Pacific Rocks 2000 – Proceedings 4th North American Rock Mechanics Symposium, 31 July–3 August, 2000, Seattle, Washington. Rotterdam, the Netherlands, A.A. Balkema, pp. 353–360.
Warpinski, N.R. and Teufel, L.W. (1987) Influence of geologic discontinuities on hydraulic fracture propagation, J. Petroleum Tech., pp. 209–220.
Zhang, X., Jeffrey, R.G. and Detournay, E. (2005) Propagation of a fluid-driven fracture parallel to the free surface of an elastic half plane, Int. J. Numer. Anal. Meth. Geomech., 29, pp. 1317–1340.
Zhang, X., Jeffrey, R.G. and Thiercelin, M. (2007) Deflection of fluid-driven fractures at bedding interfaces: A numerical investigation, J. Structural Geology, 29, pp. 396–410.
Zhang, X., Jeffrey, R.G. and Thiercelin, M. (2008) Escape of fluid-driven joints from bedding interfaces: A numerical study, J. Structural Geology, 30, pp. 478–490.




© Copyright 2019, Australian Centre for Geomechanics (ACG), The University of Western Australia. All rights reserved.
Please direct any queries or error reports to repository-acg@uwa.edu.au