Laboratory Measurement of Hydraulic-Fracture Conductivities in the Barnett Shale
- Junjing Zhang (Texas A&M University) | Anton Kamenov (Texas A&M University) | Alfred D. Hill (Texas A&M University) | Ding Zhu (Texas A&M University)
- Document ID
- Society of Petroleum Engineers
- SPE Production & Operations
- Publication Date
- August 2014
- Document Type
- Journal Paper
- 216 - 227
- 2014.Society of Petroleum Engineers
- 1.14 Casing and Cementing, 5.8.2 Shale Gas, 3.2.3 Hydraulic Fracturing Design, Implementation and Optimisation, 2.5.2 Fracturing Materials (Fluids, Proppant), 3 Production and Well Operations, 2.5.1 Fracture design and containment
- Barnett Shale, fracture conductivity
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- 1,243 since 2007
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Horizontal wells that intersect multistage transverse fractures created by low-viscosity fracturing fluid with low proppant loadings are the key to revitalizing production from the Mississippian Barnett shale in the Fort Worth basin in Texas. However, direct laboratory measurements of both natural- and induced-fracture conductivities under realistic experimental-design conditions are needed for reliable well-performance analysis and fracture-design optimization. In this work, a series of experiments was conducted to measure the conductivity of unpropped natural fractures, propped natural fractures, unpropped induced fractures and propped induced fractures with a modified American Petroleum Institute (API) conductivity cell at room temperature. Fractures were induced along the natural bedding planes, preserving fracture-surface asperities. Natural-fracture infill was taken into consideration during conductivity measurements. Proppants of various sizes were placed manually between rough fracture surfaces at realistic concentrations. The two sides of the rough fractures either were aligned or were displaced with a 0.1-in. offset. After pressure testing on the system integrity, nitrogen was flowed through the proppant pack or unpropped fracture to measure the conductivity. Results from 88 experiments show that the conductivity of hydraulic fractures in shale can be measured accurately in a laboratory with appropriate experimental procedures and good control on experimental errors. It is proved that unpropped, aligned fractures can provide a conductive path after removal of free particles and debris because of the brittleness and lamination of shale. Moreover, poorly cemented natural fractures and unpropped displaced fractures can create conductivities up to 0.5 md-ft at formation-closure stress, which is one to two orders of magnitude greater than the conductivity provided by cemented natural fractures and unpropped aligned fractures. This study shows that propped-fracture conductivity increases with larger proppant size and higher proppant concentration. Longer-term fracture-conductivity measurements indicate that, within 20 hours, the fracture conductivity could be reduced by as much as 20%.
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Awoleke, O., Romero, J., Zhu, D. et al. 2012. Experimental Investigation of Propped Fracture Conductivity in Tight Gas Reservoirs Using Factorial Design. Presented at the SPE Hydraulic Fracturing Technology Conference, The Woodlands, Texas, USA, 6-8 February. SPE-151963-MS. http://dx.doi.org/10.2118/151963-MS.
Branigan, P.T., Warpinski, N.R., Engler, B. et al. 1996. Measuring the Hydraulic Fracture-Induced Deformation of Reservoirs and Adjacent Rocks Employing a Deeply Buried Inclinometer Array: GRI/DOE Multi-Site Project. Presented at the SPE Annual Technical Conference and Exhibition, Denver, 6–9 October. SPE-36451-MS. http://dx.doi.org/10.2118/36451-MS.
Brannon, H.D., Malone, M.R., Rickards, A.R. et al. 2004. Maximizing Fracture Conductivity With Proppant Partial Monolayers: Theoretical Curiosity or Highly Productivity Reality? Presented at the SPE Annual Technical Conference and Exhibition, Houston, 26–29 September. SPE-90698-MS. http://dx.doi.org/10.2118/90698-MS.
Coulter, G.R., Benton, E.G., and Thomson, C.L. 2004. Water Fracs and Sand Quality: A Barnett Shale Example. Presented at the SPE Annual Technical Conference and Exhibition, Houston, 26–29 September. SPE-90891-MS. http://dx.doi.org/10.2118/90891-MS.
Cramer, D.D. 2008. Stimulating Unconventional Reservoirs: Lessons Learned, Successful Practices, Areas for Improvement. Presented at the SPE Unconventional Reservoirs Conference, Keystone, Colorado, USA, 10–12 February. SPE-114172-MS. http://dx.doi.org/10.2118/114172-MS.
Darin, S.R. and Huitt, J.L. 1960. Effect of a Partial Monolayer of Propping Agent on Fracture Flow Capacity. Presented at the 34th Annual Fall Meeting of SPE, Dallas, 4–7 October. SPE-1291-G.
Fredd, C.N., McConnell, S.B., Boney, C.L. et al. 2001. Experimental Study of Fracture Conductivity for Water-Fracturing and Conventional Fracturing Applications. SPE J. 6 (3): 288–298. SPE-74138-PA. http://dx.doi.org/10.2118/74138-PA.
Gale, J.F.W., Reed, R.M., and Holder, J. 2007. Natural fractures in the Barnett Shale and their importance for hydraulic fracture treatments. AAPG Bull. 91 (4): 603–622. http://dx.doi.org/10.1306/11010606061.
Grieser, B., Hobbs, J., Hunter, J. et al. 2003. The Rocket Science Behind Water Frac Design. Presented at the SPE Production and Operations Symposium, Oklahoma City, Oklahoma, USA, 22–25 March. SPE-80933-MS. http://dx.doi.org/10.2118/80933-MS.
ISO 13503-2:2006, Petroleum and natural gas industries—Completion fluids and materials—Part 2: Measurement of properties of proppants used in hydraulic fracturing and gravel packing operations. 2006. Geneva, Switzerland: ISO.
King, G.E. 2010. Thirty Years of Gas Shale Fracturing: What Have We Learned? Presented at the SPE Annual Technical Conference and Exhibition, Florence, Italy, 19-22 September. SPE-133456-MS. http://dx.doi.org/10.2118/133456-MS.
King, G.E., Haile, L., Shuss, J.A. et al. 2008. Increasing Fracture Path Complexity and Controlling Downward Fracture Growth in the Barnett Shale. Presented at the SPE Shale Gas Production Conference, Fort Worth, Texas, USA, 16-18 November. SPE-119896-MS. http://dx.doi.org/10.2118/119896-MS.
Marpaung, F., Chen, F., Pongthunya, P. et al. 2008. Measurement of Gel Cleanup in a Propped Fracture With Dynamic Fracture Conductivity Experiments. Presented at the SPE Annual Technical Conference and Exhibition, Denver, 21–24 September. SPE-115653-MS. http://dx.doi.org/10.2118/115653-MS.
Mayerhofer, M.J., Lolon, E.P., Youngblood, J.E. et al. 2006. Integration of Microseismic Fracture Mapping Results with Numerical Fracture Network Production Modeling in the Barnett Shale. Presented at the SPE Annual Technical Conference and Exhibition, San Antonio, Texas, USA, 24–27 September. SPE-102103-MS. http://dx.doi.org/10.2118/102103-MS.
Mayerhofer, M.J., Richardson, M.F., Walker, R.N. Jr. et al. 1997. Proppants? We Don’t Need No Proppants. Presented at the SPE Annual Technical Conference and Exhibition, San Antonio, Texas, USA, 5–8 October. SPE-38611-MS. http://dx.doi.org/10.2118/38611-MS.
Morales, R.H., Suarez-Rivera, R., and Edelman, E. 2011. Experimental Evaluation of Hydraulic Fracture Impairment in Shale Reservoirs. Presented at the 45th US Rock Mechanics /Geomechanics Symposium, San Francisco, 26–29 June. ARMA 11-380.
Navarrete, R.C., Holms, B.A., McConnell, S.B. et al. 1998. Emulsified Acid Enhances Well Production in High-Temperature Carbonate Formations. Presented at the European Petroleum Conference, The Hague, 20–22 October. SPE-50612-MS. http://dx.doi.org/10.2118/50612-MS.
Ramurthy, M., Barree, R.D., Kundert, D.P. et al. 2011. Surface-Area vs. Conductivity-Type Fracture Treatments in Shale Reservoirs. SPE Prod & Oper 26 (4): 357-367. SPE-140169-PA. http://dx.doi.org/10.2118/140169-PA.
Rivers, M., Zhu, D., and Hill, A.D. 2012. Proppant Fracture Conductivity With High Proppant Loading and High Closure Stress. Presented at the SPE Hydraulic Fracturing Technology Conference, The Woodlands, Texas, USA, 6-8 February. SPE-151972-MS. http://dx.doi.org/10.2118/151972-MS.
Palisch, T.T., Vincent, M., and Handren, P.J. 2010. Slickwater Fracturing: Food for Thought. SPE Prod & Oper 25 (3): 327-344. SPE-115766-PA. http://dx.doi.org/10.2118/115766-PA.
Parker, M., Glasbergen, G., van Batenburg, D. et al. 2005. High-Porosity Fractures Yield High Conductivity. Presented at the SPE Annual Technical Conference and Exhibition, Dallas, 9–12 October. SPE-96848-MS. http://dx.doi.org/10.2118/96848-MS.
Pournik, M., Zou, C., Malagon, C. et al. 2007. Small-Scale Fracture Conductivity Created by Modern Acid-Fracture Fluids. Presented at the SPE Hydraulic Fracturing Technology Conference, College Station, Texas, USA, 29–31 January. SPE-106272-MS. http://dx.doi.org/10.2118/106272-MS.
Papazis, P.K. 2005. Petrographic Characterization of the Barnett Shale, Fort Worth Basin, Texas. MS thesis. 2005. . MS thesis, University of Texas at Austin, Austin, Texas (Summer 2005).
Shelley, B., Johnson, B.J., Fielder, E.O. et al. 2008. Data Analysis of Barnett Shale Completions. SPE J. 13 (3): 366–374. SPE-100674-PA. http://dx.doi.org/10.2118/100674-PA.
van Dam, D.B. and de Pater, C.J. 1999. Roughness of Hydraulic Fractures: The Importance of In-Situ Stress and Tip Processes. Presented at the SPE Annual Technical Conference and Exhibition, Houston, 3-6 October. SPE-56596-MS. http://dx.doi.org/10.2118/56596-MS.
Vincent, M.C. 2002. Proving It—A Review of 80 Published Field Studies Demonstrating the Importance of Increased Fracture Conductivity. Presented at the SPE Annual Technical Conference and Exhibition, San Antonio, Texas, USA, 29 September–2 October. SPE 77675. http://dx.doi.org/10.2118/77675-MS.
Warpinski, N.R. 2010. Stress Amplification and Arch Dimensions in Proppant Beds Deposited by Waterfracs. SPE Prod & Oper 25 (4): 461-471. SPE-119350-PA. http://dx.doi.org/10.2118/119350-PA.
Wiley, C., Barree, B., Eberhard, M. et al. 2004. Improved Horizontal Well Stimulations in the Bakken Formation, Williston Basin, Montana. Presented at the SPE Annual Technical Conference and Exhibition, Houston, 28–29 September. SPE-90697-MS. http://dx.doi.org/10.2118/90697-MS.