Hydraulic Fracturing Mechanism in Reservoirs with a Linear Inclusion Fissure

Wang Wenwu, Zhu Xiuxing, Ye Guigen, Han Zhongying, Xue Shifeng

Abstract


Hydraulic fracturing technology is widely used in most oil-water wells to improve production. However, the mechanism of fracturing in a reservoir with inclusion fissures is still unclear. In this study, a theoretical model was developed to determine the stress distribution during hydraulic fracturing. The line inclusion fissure was regarded as a thin bar and the stress around the artificial fracture, which is affected by a single line inclusion, was determined using the Eshelby equivalent inclusion theory. Stress intensity factors at the tip of both the artificial fracture and the inclusion were achieved, and initiation of the fracture was predicted. Furthermore, to validate the theoretical model, re-fracturing experiments were performed on a large-scale tri-axial system. The results showed that the defects reduce the intensity of the rock, which introduces the possibility that more complex fractures emerge in the reservoir. The results also showed that the fracture direction is governed by far-field stress. The obtained conclusions are helpful to better understand the mechanism of hydraulic fracturing in reservoirs.

Full Text:

PDF

References


Beugelsdijk, L.J.L., Pater, C.J. & Sato, K., Experimental Hydraulic Fracture Propagation in a Multi-fractured Medium, SPE Asia Pacific Conference on Integrated Modelling for Asset Management, 25-26 April, Yokohama, Japan, Society of Petroleum Engineers, SPE 59419, 2000.

Peacock, D.C.P. & Mann, A., Controls on Fracturing in Carbonate Rocks, SPE Middle East Oil and Gas Show and Conference, 12-15 March, Kingdom of Bahrain, Society of Petroleum Engineers, SPE 92980, 2005.

Chitrala, Y., Moreno, C., Sondergeld, C. & Rai C., An Experimental Investigation into Hydraulic Fracture Propagation under Different Applied Stresses in Tight Sands Using Acoustic Emissions, Journal of Petroleum Science and Engineering, 108(1), pp. 151-161, 2013.

Nagel, N-B., Sanchez-Nagel, M-A., Zhang, F., Garcia, X. & Lee. B., Coupled Numerical Evaluations of the Geomechanical Interactions Between a Hydraulic Fracture Stimulation and a Natural Fracture System in Shale Formations, Rock Mechanics and Rock Engineering, 46(3), pp. 581-609, 2013.

Bruno, M-S. & Nakagawa. F-M., Pore Pressure Influence on Tensile Fracture Propagation in Sedimentary Rock, International Journal of Rock Mechanics and Mining Sciences, 28(4), pp. 261-273, 1991.

Berchenko, I. & Detournay, E., Deviation of Hydraulic Fractures Through Poroelastic Stress Changes Induced by Fluid Injection and Pumping, International Journal of Rock Mechanics and Mining Sciences, 34(6), pp. 1009-1019, 1997.

Kresse, O., Weng, X., Gu, H. & Wu. R., Numerical Modeling of Hydraulic Fractures Interaction in Complex Naturally Fractured Formations, Rock Mechanics and Rock Engineering, 46(3), pp. 555-568, 2013.

Liu, H., Yang, T., Xu, T. & Yu. Q., A Comparative Study of Hydraulic Fracturing with Various Boreholes in Coal Seam, Geosciences Journal, 19(3), pp. 489-502, 2015.

Zhou, J., Chen, M., Jin, Y. & Zhang. G., Experimental Study on Propagation Mechanism of Hydraulic Fracture in Naturally Fractured Reservoir, Acta Petrolei Sinica, 28(5), pp. 109-113, 2007.

Zhou, J. & Xue, C., Experimental Investigation of Fracture Interaction between Natural Fractures and Hydraulic Fracture in Naturally Fractured Reservoirs. SPE EUROPEC/EAGE Annual Conference and Exhibition, 23-26 May, Vienna, Society of Petroleum Engineers, SPE 142890, 2011.

Liu, Z., Chen, M. & Zhang, G., Analysis of the Influence of a Natural Fracture Network on Hydraulic Fracture Propagation in Carbonate Formations, Rock Mechanics and Rock Engineering, 47(2), pp. 575-587, 2014.

Xu, T., Ranjith, P-G., Au, A-S-K., Wasantha, P-L-P., Yang, T-H., Tang, C-A., Liu, H-L. & Chen C-F., Numerical and Experimental Investigation of Hydraulic Fracturing in Kaolin Clay, Journal of Petroleum Science and Engineering, 134(1), pp. 223-236, 2015.

Huang, J., Griffiths, D-V. & Wong. S-W., Initiation Pressure, Location and Orientation of Hydraulic Fracture, International Journal of Rock Mechanics and Mining Sciences, 49(1), pp. 59-67, 2012.

Jin, Y., Chen, M., Zhou, J. & Geng, D., Experimental Study on the Effects of Salutatory Barrier on Hydraulic Fracture Propagation of Cement Blocks, Acta Petrolei Sinica, 29(2), pp. 300-303, 2008.

Carrier, B. & Granet, S., Numerical Modeling of Hydraulic Fracture Problem in Permeable Medium Using Cohesive Zone Model, Engineering Fracture Mechanics, 79(1), pp. 312-328, 2012.

Mohammadnejad, T. & Khoei, A-R., An Extended Finite Element Method for Hydraulic Fracture Propagation in Deformable Porous Media with The Cohesive Crack Model, Finite Elements in Analysis and Design, 73(1), pp. 77-95, 2013.

Peirce, A., Modeling Multi-scale Processes in Hydraulic Fracture Propagation Using the Implicit Level Set Algorithm, Computer Methods in Applied Mechanics and Engineering, 283(1), pp. 881-908, 2015.

Davies, R., Foulger, G., Bindle, A. & Styles, P., Induced Seismicity and Hydraulic Fracturing for the Recovery of Hydrocarbons, Marine and Petroleum Geology, 45(1), pp. 171-185, 2013.




DOI: http://dx.doi.org/10.5614%2Fj.eng.technol.sci.2016.48.2.8

Refbacks

  • »
  • »
  • »
  • »
  • »
  • »
  • »
  • »