Anisotropic porothermoelastic solution and hydro-thermal effects on fracture width in hydraulic fracturing
Article first published online: 14 AUG 2013
Copyright © 2013 John Wiley & Sons, Ltd.
International Journal for Numerical and Analytical Methods in Geomechanics
Volume 38, Issue 5, pages 493–517, 10 April 2014
How to Cite
Abousleiman, Y. N., Hoang, S. K. and Liu, C. (2014), Anisotropic porothermoelastic solution and hydro-thermal effects on fracture width in hydraulic fracturing. Int. J. Numer. Anal. Meth. Geomech., 38: 493–517. doi: 10.1002/nag.2216
- Issue published online: 3 MAR 2014
- Article first published online: 14 AUG 2013
- Manuscript Accepted: 3 JUL 2013
- Manuscript Revised: 4 MAY 2013
- Manuscript Received: 3 NOV 2012
- PoroMechanics Industrial Consortium
- hydraulic fracturing;
- analytical solution
In this study, the effects of the temperature difference between hydraulic fracturing fluid and rock formation on the time-dependent evolution of fracture width were investigated using a newly derived one-dimensional anisotropic porothermoelastic analytical solution. The solution is shown to correctly reproduce existing solutions for special cases and corrections for an earlier publication are provided. An analysis of time-dependent fracture width evolution using Woodford Shale data was also presented. It was found that when the fracturing fluid has the same temperature as the shale formation, the fracture gradually closes back after the initial opening due to the invasion of the fracturing fluid. Practically, in this scenario, proppants should be pumped into the fracture as soon as possible to obtain maximum fracture conductivity. On the other hand, with a fracturing fluid 60 °C colder than the formation, the thermal contraction of the rock dominates the fracture aperture evolution, resulting in a fracture aperture approximately 70% larger than that produced by the hotter fracturing fluid. Consequently, in this case, it is beneficial to delay proppant placement to take advantage of the widening fractures. Finally, it was found that the fracture aperture is directly controlled by the spacing of natural fractures. Therefore, the presence of natural fractures in the shale formation and their spacing influence not only the type of hydraulic fractures created but also what kind and size of proppants should be used to keep them open. Copyright © 2013 John Wiley & Sons, Ltd.