Optimization of the Horizontal-Well Hydraulic-Fracture Geometry From Caprock-Integrity Point of View Using Fully Coupled 3D Cohesive Elements
- Authors
- Seyed Erfan Saberhosseini (Islamic Azad University) | Hossein Mohammadrezaei (Iranian Offshore Oil Company) | Omid Saeidi (Iranian Offshore Oil Company) | Nadia Shafie Zadeh (Natural Resources Canada) | Ali Senobar (Iranian Offshore Oil Company)
- DOI
- https://doi.org/10.2118/187965-PA
- Document ID
- SPE-187965-PA
- Publisher
- Society of Petroleum Engineers
- Source
- SPE Production & Operations
- Volume
- 33
- Issue
- 02
- Publication Date
- May 2018
- Document Type
- Journal Paper
- Pages
- 251 - 268
- Language
- English
- ISSN
- 1930-1855
- Copyright
- 2018.Society of Petroleum Engineers
- Keywords
- Cap rock integrity, Injection rate, Hydraulic fracturing, Fracture geometry, Cohesive elements
- Downloads
- 5 in the last 30 days
- 182 since 2007
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Summary
Pre-analysis of the geometry of a hydraulically induced fracture, including fracture width, length, and height, plays a crucial role in a successful hydraulic-fracturing (HF) operation. Besides the geometry of the fracture, the injection rate should be optimal for obtaining desired results such as maintaining sufficient aperture for proppant placement, avoiding screenouts or proppant bridging, and also preventing caprock-integrity failure as a result of an extensively uncontrolled fracture in reservoirs. A sophisticated numerical model derived from the cohesive-elements method has been developed and validated using field data to obtain an insight on the optimal fracture geometry and injection rate that can lead to a safe and efficient operation. The HF operation has been conducted in an oil field in the Persian Gulf with the aim of enhanced oil recovery (EOR) from a limestone reservoir with low matrix permeability in a horizontal wellbore. The concept of the cohesive-elements method with pore pressure as an additional degree of freedom has been applied to a 3D fully coupled HF model to estimate fracture geometry, specifically fracture height as a function of the optimal injection rate in a reservoir porous medium. It was observed that by increasing injection rate, all the fracture-geometry parameters steeply increased, but the fracture height must be controlled to be in the reservoir domain and not surpass the caprock and sublayer. For the reservoir under study with the maximum height of 100 m, length of 250 m, width of 100 m, permeability of 2 md, and porosity of 10%, the optimal fracture height is 73.4 m; the average fracture width and half-length are 12.8mm and 55.4 m, respectively. Therefore, the optimal injection rate derived from the fracture height and geometry is in this case 4.5 bbl/min. The computed fracture pressure (49.55 MPa = 7,283.85 psi) has been compared with the field fracture pressure (51.02 MPa = 7,500 psi), and the error obtained for these two values is 2.88%, which showed a very good agreement.
| File Size | 3 MB | Number of Pages | 18 |
References
ABAQUS. 2011. ABAQUS, Version 6.11-1.
Advani, S. H., Khattab, H., and Lee, J. K. 1985. Hydraulic Fracture Geometry Modeling, Prediction, and Comparisons. Presented at the SPE/DOE Low Permeability Gas Reservoirs Symposium, Denver, 19–22 March. SPE-13863-MS. https://doi.org/10.2118/13863-MS.
Aghighi, M. A., Valencia, K. J. L., Chen, Z. et al. 2006. An Integrated Approach to the Design and Evaluation of Hydraulic Fracture Treatments in Tight Gas and Coalbed Methane Reservoirs. Presented at the SPE Annual Technical Conference and Exhibition, San Antonio, Texas, 24–27 September. SPE-102880-MS. https://doi.org/10.2118/102880-MS.
Batchelor, G. K. 1967. An Introduction to Fluid Dynamics. London: Cambridge University Press.
Carrier, B. and Granet S. 2012. Numerical Modeling of Hydraulic Fracture Problem in Permeable Medium Using Cohesive Zone Model. Eng. Fract. Mech. 79 (January): 312–328. https://doi.org/10.1016/j.engfracmech.2011.11.012.
Chen, Z. 2011. Finite Element Modeling of Viscosity-Dominated Hydraulic Fractures. J. Pet. Sci. Eng. 88–89 (June): 136–144. https://doi.org/10.1016/j.petrol.2011.12.021.
Chen, Z. R., Bunger, A. P., Zhang, X. et al. 2009. Cohesive Zone Finite Element Based Modeling of Hydraulic Fractures. Acta Mech. Solida Sin. 22 (5): 443–452. https://doi.org/10.1016/S0894-9166(09)60295-0.
Dahi Taleghani, A. and Olson, J. E. 2014. How Natural Fractures Could Affect Hydraulic-Fracture Geometry. SPE J. 19 (1): 161–171. SPE-167608-PA. https://doi.org/10.2118/167608-PA.
Frash, L. P., Hood, J., Gutierrez, M. et al. 2014. Laboratory Measurement of Critical State Hydraulic Fracture Geometry. Presented at the 48th US Rock Mechanics/Geomechanics Symposium, Minneapolis, Minnesota, 1–4 June. ARMA-2014-7316.
Haimson, B. C. and Cornet, F. H. 2003. ISRM Suggested Methods for Rock Stress Estimation—Part 3: Hydraulic Fracturing (HF) and/or Hydraulic Testing of Pre-Existing Fractures (HTPF). Int. J. Rock Mech. Min. 40 (7–8): 1011–1020. https://doi.org/10.1016/j.ijrmms.2003.08.002.
Jamiolahmady, M., Sohrabi, M., and Mahdiyar, H. 2009. Optimization of Hydraulic Fracture Geometry. Presented at the Offshore Europe, Aberdeen, 8–11 September. SPE-123466-MS. https://doi.org/10.2118/123466-MS.
Peirce, A. and Detournay, E. 2008. An Implicit Level Set Method for Modeling Hydraulically Driven Fractures. Comput. Method. Appl. M. 197 (33–40): 2858–2885. https://doi.org/10.1016/j.cma.2008.01.013.
Peska, P. and Zoback, M. D. 1995. Compressive and Tensile Failure of Inclined Wellbores and Determination of In-Situ Stresses and Rock Strength. J. Geophys. Res. 100 (B7): 12791–12811. https://doi.org/10.1029/95JB00319.
Saberhosseini, S. E., Keshavarzi, R., and Alidoust, S. 2013. Stability Analysis of a Horizontal Oil Well in a Strike-Slip Fault Regime. Austrian J. Earth Sci. 106 (2): 30–36.
Saberhosseini, S. E., Keshavarzi, R., and Ahangari, K. 2014. A New Geomechanical Approach to Investigate the Role of In-Situ Stresses and Pore Pressure on Hydraulic Fracture Pressure Profile in Vertical and Horizontal Oil Wells. Geomech. Eng. 7 (3): 233–246. https://doi.org/10.12989/gae.2014.7.3.233.
Saberhosseini, S. E., Keshavarzi, R., and Ahangari, K. 2017a. A Fully Coupled Three-Dimensional Hydraulic Fracture Model to Investigate the Impact of Formation Rock Mechanical Properties and Operational Parameters on Hydraulic Fracture Opening Using Cohesive-Elements Method. Arab. J. Geosci. 10 (157): 1–8. https://doi.org/10.1007/s12517-017-2939-7.
Saberhosseini, S. E., Keshavarzi, R., and Ahangari, K. 2017b. A Fully Coupled Numerical Modeling to Investigate the Role of Rock Thermo-Mechanical Properties on Reservoir Uplifting in Steam Assisted Gravity Drainage. Arab. J. Geosci. 10 (152): 1–10. https://doi.org/10.1007/s12517-017-2937-9.
Sarris, E. and Papanastasiou, P. 2011. The Influence of the Cohesive Process Zone in Hydraulic Fracture Modeling. Int. J. Fract. 167 (1): 33–45. https://doi.org/10.1007/s10704-010-9515-4.
Tomar, V., Zhai, J., and Zhou, M. 2004. Bounds for Element Size in a Variable Stiffness Cohesive Finite Element Model. Int. J. Numer. Meth. Eng. 61 (11): 1894–1920. https://doi.org/10.1002/nme.1138.
Valkó, P. and Economides, M. J. 1997. Hydraulic Fracture Mechanics. Hoboken, New Jersey: Wiley.
van Eekelen, H. A. M. 1982. Hydraulic Fracture Geometry: Fracture Containment in Layered Formations. SPE J. 22 (3): 341–349. SPE-9261-PA. https://doi.org/10.2118/9261-PA.
Zeng, F. and Zhao, G. 2008. The Optimal Hydraulic Fracture Geometry Under Non-Darcy Flow Effects. Presented at the CIPC/SPE Gas Technology Symposium 2008 Joint Conference, Calgary, 16–19 June. SPE-114285-MS. https://doi.org/10.2118/114285-MS.
Zhang, G. M., Liu, H., Zhang, J. et al. 2010. Three-Dimensional Finite Element Simulation and Parametric Study for Horizontal Well Hydraulic Fracture. J. Pet. Sci. Eng. 72 (3–4): 310–317. https://doi.org/10.1016/j.petrol.2010.03.032.
Zhou, T., Zhang, S., Zou, Y. et al. 2016. A Study of Hydraulic Fracture Geometry Concerning Complex Geologic Condition in Shales. Presented at the International Petroleum Technology Conference, Bangkok, 14–16 November. IPTC-19014-MS. https://doi.org/10.2523/IPTC-19014-MS.
