Determination of Closure Stress and Characterization of Natural Fractures with Micro-Fracturing Field Data
- Farrukh Hamza (Halliburton) | Farrokh Sheibani (Massachusetts Institute of Technology) | Hamid Hadibeik (Halliburton) | Mehdi Azari (Halliburton) | Mohamed Esawi (Halliburton) | Sandeep Ramakrishna (Halliburton)
- Document ID
- Society of Petroleum Engineers
- SPE Western Regional Meeting, 22-26 April, Garden Grove, California, USA
- Publication Date
- Document Type
- Conference Paper
- 2018. Society of Petroleum Engineers
- 3 Production and Well Operations, 0.2.2 Geomechanics, 2 Well completion, 2.4 Hydraulic Fracturing, 0.2 Wellbore Design, 5.5 Reservoir Simulation, 5 Reservoir Desciption & Dynamics, 5.8 Unconventional and Complex Reservoirs, 3 Production and Well Operations, 5.8.6 Naturally Fractured Reservoir
- Micro-Fracturing, unconventional reservoirs, Field example, modeling, Stresses
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- 214 since 2007
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Hydraulic fracturing is now considered to be a standard completions process used to improve oil and gas recovery in unconventional reservoirs. Injection/fall-off pressure from a micro-fracturing test contains important geomechanical information, including the inference of the minimum horizontal stress, natural fracture permeability, and in-situ pore pressure. The determination of in-situ stress is crucial for designing, modeling, and evaluating hydraulic fractures. This paper presents a field example of a micro-fracturing job to determine minimum horizontal stress and characterize natural fractures in terms of permeability.
The analysis of micro-fracturing data consists of two parts: pre-closure analysis and after-closure analysis. The pre-closure analysis involved the analysis of early pressure fall-off data to determine the fracture closure stress of a particular formation at a specific depth. The tests were performed by injecting a small volume of fluid into a small, confined, and isolated zone at low rates to create a small fracture. The closure stress was determined from the analysis of the pressure decline after shut-in. To estimate natural fracture permeability, a series of numerical fully coupled hydro-mechanical simulations of hydraulic fracture propagation was conducted in a naturally fractured reservoir by varying the natural fracture initial permeabilities.
The pressure decline after shut-in of the formation tester pump was analyzed using G-function and square-root-time methods. The point at which the G-function derivative began to deviate downward from the linear trend was identified as the point at which the fracture closes. The cycle of injection and fall-off was repeated four times. After the first cycle, in each subsequent cycle, the fracture pressure was reduced by approximately 20 psi. Based on these four cycles and petrophysical data, a customized model was developed, and poro-mechanical simulations were performed to characterize natural fractures in the formation. The simulation results explain the variation of micro-fracturing pressure history, during the four injection cycles. A comparison of the pressure history from the micro-fracture tests with the injection pressure obtained from the numerical simulation suggested that the formation included relatively impermeable natural fractures.
The characterization of natural fractures during micro-fracturing provides additional information not captured by a traditional G-function or square-root-time analysis. Multiple cycles of injection and pressure fall-off provide a qualitative assessment of in-situ pore pressure and a consistent minimum in-situ stress. Understanding the fracture pressure and natural fractures in the formation is a key component of successful reservoir completion and development. However, challenges exist in the measurement of these reservoir properties with conventional methods of diagnostic fracture injection testing (DFIT™). This new analysis method represents a step forward in terms of overcoming such challenges.
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Barree, R.D., Barree, V.L., and Craig, D. 2007. Holistic Fracture Diagnostics. Presented at the Rocky Mountain Oil & Gas Symposium, Denver, Colorado, USA, 16-18 April. SPE-107877-MS. https://doi.org/10.2118/107877-MS.
Barree, R.D., Barree, V.L., and Craig, D. 2009. Holistic Fracture Diagnostics: Consistent Interpretation of Prefrac Injection Tests Using Multiple Analysis Methods. SPE Prod & Oper 24 (03): 396–406. SPE-107877-PA. https://doi.org/10.2118/107877-PA.
Barree, R.D. and Miskimins, J.L. 2015. Calculation and Implications of Breakdown Pressures in Directional Wellbore Stimulation. Presented at the SPE Hydraulic Fracturing Technology Conference, The Woodlands, Texas, USA, 3-5 February. SPE-173356-MS. https://doi.org/10.2118/173356-MS.
Cherian, B.V., McCleary, M., Fluckiger, S.. 2015. Production Performance in the In-Fill Development of Unconventional Resources. Presented at the SPE/CSUR Unconventional Resources Conference, Calgary, Alberta, Canada, 20-22 October. SPE-175963-MS. https://doi.org/10.2118/175963-MS.
Forni, P., Bonapace, J.C., Kovalenko, F.. 2015. Conditioning Pre-Existing Old Vertical Wells to Stimulate and Test Vaca Muerta Shale Productivity through the Application of Pinpoint Completion Techniques. Presented at the SPE Middle East Oil & Gas Show and Conference, Manama, Bahrain, 8-11 March. SPE-172724-MS. https://doi.org/10.2118/172724-MS.
Hamza, F., Gu, M., Quirein, J.. 2016. Improved Characterization of Anisotropic Elastic Moduli and Stress for Unconventional Reservoirs Using Laboratory Mineralogy, TOC, Static, and Dynamic Geomechanical Data. Presented at the SPWLA 57th Annual Logging Symposium, Reykjavik, Iceland, 25–29 June. SPWLA-2016-AA.
Hamza, F., Chen, C., Gu, M.. 2015. Characterization of Anisotropic Elastic Moduli and Stress for Unconventional Reservoirs Using Laboratory Static and Dynamic Geomechanical Data. Presented at the SPE/CSUR Unconventional Resources Conference, Calgary, Alberta, Canada, 20–22 October. SPE-175907. https://doi.org/10.2118/175907-MS.
Hashmi, G.M., Kabir, C.S., and Hasan, A.R. 2015. Estimating Reliable Gas Rate with Transient-Temperature Modeling for Interpreting Early-Time Cleanup Data during Transient Testing, Journal of Petroleum Science and Engineering, 133: 285–295. https://doi.org/10.1016/j.petrol.2015.06.001.
Jin, X., Shah, S.N., Roegiers, J.-C.. 2013. Breakdown Pressure Determination - A Fracture Mechanics Approach. Presented at the SPE Annual Technical Conference and Exhibition, New Orleans, Louisiana, USA, 30 September-2 October. SPE-166434-MS. https://doi.org/10.2118/166434-MS.
Karpov, V.B., Parshin, N.V., Ryazanov, A.A.. 2017. Improved Hydraulic Fracturing Results Utilizing Microfrac Testing in a West Siberia Field. Presented at the SPE Russian Petroleum Technology Conference, Moscow, Russia, 16-18 October. SPE-187935-MS. https://doi.org/10.2118/187935-MS.
King, G.E. 2012. Hydraulic Fracturing 101: What Every Representative, Environmentalist, Regulator, Reporter, Investor, University Researcher, Neighbor and Engineer Should Know About Estimating Frac Risk and Improving Frac Performance in Unconventional Gas and Oil Wells. Presented at the SPE Hydraulic Fracturing Technology Conference, The Woodlands, Texas, USA, 6-8 February. SPE-152596-MS. https://doi.org/10.2118/152596-MS.
Lashgari, H.R., El Rabaa, W., Chan, H.. 2014. Estimation of Hydraulic Fracture Contribution in Medium to High Permeability Reservoirs. Presented at the SPE Western North American and Rocky Mountain Joint Meeting, Denver Colorado, USA, 17-18 April. SPE-169554-MS. https://doi.org/10.2118/169554-MS.
Lecampion, B., Abbas, S., and Prioul, R. 2013. Competition Between Transverse and Axial Hydraulic Fractures In Horizontal Wells. Presented at the SPE Hydraulic Fracturing Technology Conference, The Woodlands, Texas, USA. 4-6 February. https://doi.org/10.2118/163848-MS
Lin, A. and Ma, J. 2015. Stimulated-Rock Characteristics and Behavior in Multistage Hydraulic-Fracturing Treatment. Presented at SPE/EAGE European Unconventional Resources Conference and Exhibition, Vienna, Austria, 25-27 February. SPE-167716-MS. https://doi.org/10.2118/167716-PA.
Malik, M., Singh, A., and Lal, M.K. 2015. Stress Profiling with Microfracturing and Sonic Logs in Antelope Shale. Presented at the SPE Annual Technical Conference and Exhibition, Houston, Texas, USA, 28-30 September. SPE-157002-MS. https://doi.org/10.2118/175002-MS.
McClure, M.W., Jung, H., Cramer, D.D.. 2016. The Fracture-Compliance Method for Picking Closure Pressure from Diagnostic Fracture-Injection Tests (see associated supplementary discussion/reply). SPE J 21 (04): 1,321–1,339. SPE-179725-PA. https://doi.org/10.2118/179725-PA.
Narasimhan, S., Shaikh, H., Gray, J. K.. 2016. Effect of Horizontal Stress Models and Biot Poro-Elasticity on Predicted Fracture Geometry. Presented at the SPE Hydraulic Fracturing Technology Conference, The Woodlands, Texas, USA, 9-11 February. SPE-179162-MS. https://doi.org/10.2118/179162-MS.
Nguyen, D.H. and Cramer, D.D. 2013. Diagnostic Fracture Injection Testing Tactics in Unconventional Reservoirs. Presented at the SPE Hydraulic Fracturing Technology Conference, The Woodlands, Texas, USA, 4-6 February. SPE-163863-MS. https://doi.org/10.2118/163863-MS.
Nojabaei, B. and Kabir, S. 2012. Establishing Key Reservoir Parameters with Diagnostic Fracture Injection Testing. Presented at the SPE Americas Unconventional Resources Conference, Pittsburgh, Pennsylvania, USA, 5-7 June. SPE-153979-MS. https://doi.org/10.2118/153979-MS.
Nolte, K.G. 1979. Determination Of Fracture Parameters From Fracturing Pressure Decline. Presented at the SPE Annual Technical Conference and Exhibition, Las Vegas, Nevada, USA, 23-26 September. SPE-8341-MS. https://doi.org/10.2118/8341-MS.
Nolte, K.G. 1986. A General Analysis of Fracturing Pressure Decline With Application to Three Models. SPE Form Eval 1 (06): 571–583. SPE-12941-PA. https://doi.org/10.2118/12941-PA.
Nordgren, R.P. 1972. Propagation of a Vertical Hydraulic Fracture. SPE Journal. 12 (4): 306–314. SPE-3009-PA. https://doi.org/10.2118/3009-PA.
Perkins, T.K. and Kern, L.R. 1961. Widths of Hydraulic Fractures. JPT 13 (9): 937–949. SPE-89-PA. https://doi.org/10.2118/89-PA.
Shaikh, H., Iwuoha, S., and Islam, A. 2017. Novel Techniques for Modelling Re-Fracturing in Tight Reservoirs. Presented at the SPE/IADC Drilling Conference and Exhibition, The Hague, The Netherlands, 14-16 March. SPE-184699-MS. https://doi.org/10.2118/184699-MS.
Soliman, M.Y., East, L.E., and Adams, D.L. 2008. Geomechanics Aspects of Multiple Fracturing of Horizontal and Vertical Wells. Presented at the SPE International Thermal Operations and Heavy Oil Symposium and Western Regional Meeting, Bakersfield, California, USA, 16-18 March. SPE-86992-MS. http://doi.org/10.2118/86992-MS.
Soliman, M.Y. and Gamadi, T.D. 2012. Testing Tight Gas and Unconventional Formations and Determination of Closure Pressure. Presented at the SPE/EAGE European Unconventional Resources Conference and Exhibition, Vienna, Austria, 20-22 March. SPE-150948-MS. https://doi.org/10.2118/150948-MS.
Sone, H. and Zoback, M.D. 2013. Mechanical Properties of Shale-Gas Reservoir Rocks — Part 1: Static and Dynamic Elastic Properties and Anisotropy." Geophysics, 78(5): D381–D392. http://doi.org/10.1190/geo2013-0050.1
Stolte, C.J., Wu, C.S., Carroll, D.C., . 2012. The Path from Vertical to Horizontal Shale Gas Wells. Presented at the IADC/SPE Asia Pacific Drilling Technology Conference and Exhibition, Tianjin, China, 9-11 July. SPE-157327-MS. https://doi.org/10.2118/157327-MS.
US EIA. 2017. Annual Energy Outlook 2017 with Projections to 2050. https://www.eia.gov/outlooks/aeo/pdf/0383(2017).pdf (accessed 25 January 2018).
Yuan, R., Jin, L., Zhu, C., . 2013a. Vertical or Horizontal? Hydraulic Fracture Geometry as a Make or Break to a Tight Gas Field in the Western Sichuan Basin. Presented at the International Petroleum Technology Conference, Beijing, China, 26-28 March. IPTC-16757-MS. https://doi.org/10.2523/IPTC-16757-MS.
Yuan, Y., Xu, B., and Palmgren, C. 2013b. Design of Caprock Integrity in Thermal Stimulation of Shallow Oil-Sands Reservoirs. Presented at Canadian Unconventional Resources Conference, Calgary, Alberta, Canada, 15-17 November. SPE-149371-MS. https://doi.org/149371-PA.