Enhanced-Oil-Recovery Potential for Lean-Gas Reinjection in Zipper Fractures in Liquid-Rich Basins
- Oluwanifemi Akinluyi (University of Tulsa) | Randy Hazlett (University of Tulsa)
- Document ID
- Society of Petroleum Engineers
- SPE Journal
- Publication Date
- October 2017
- Document Type
- Journal Paper
- 2017.Society of Petroleum Engineers
- CO2, Injection, EOR, Unconventional resources, Zipper fractures
- 187 in the last 30 days
- 668 since 2007
- Show more detail
- View rights & permissions
|SPE Member Price:||USD 10.00|
|SPE Non-Member Price:||USD 30.00|
Production from liquid-rich shale has become an important contributor to US production, but recovery factors are low. Enhanced-oil-recovery (EOR) methods require injectivity and interwell communication on reasonable time scales. Herein, we investigate the development of fracture interference for the application of recycled-lean-gas injection to displace reservoir fluids between zipper fractures in liquid-rich shales. In condensate systems, the liquids produced from miscible displacement could be extracted at the surface and the gas reinjected. In unconventional oil systems, immiscible displacement would occur with arrest in the oil-rate decline upon the onset of pressure support until immiscible front breakthrough, although this may never occur in a reasonable time. In either case, the time for interference is critical in assessment of process feasibility.
Using superposition plus existing analytical solutions to the diffusivity equation for arbitrarily oriented line sources/sinks for pressure and new extensions for the pressure logarithmic temporal derivative, we analyze the time for interfracture-communication development (i.e., interference) and productivity index (PI) for both classical biwing fractures in a zipper configuration and complex-fracture networks. As a novel contribution, we demonstrate the ability to map both pressure and pressure temporal derivative as a function of time and space for production and/or injection from parallel motherbores under the infinite-conductivity wellbore and fracture assumption. The infinite-conductivity assumption could be relaxed later for more-general cases.
We present the results in terms of geometrical-spacing requirement for both horizontal wells and stimulation treatments to achieve reasonable time frames for interfracture communication and sweep for parameters typical of various shale plays. Results can be used to determine whether spacing currently considered for primary production is sufficient for direct implementation of EOR or if current practice should be modified with EOR in the field-development plan.
|File Size||2 MB||Number of Pages||15|
Acuña, J. A. 2016. Analytical Pressure and Rate Transient Models for Analysis of Complex Fracture Networks in Tight Reservoirs. Presented at the Unconventional Resources Technology Conference, San Antonio, Texas, USA, 1–3 August. URTEC-2429710-MS. https://doi.org/10.15530/URTEC-2016-2429710.
Barree, R. D., Cox, S. A., Miskimins, J. L. et al. 2014. Economic Optimization of Horizontal Well Completions in Unconventional Reservoirs. Presented at the SPE Hydraulic Fracturing Technology Conference, The Woodlands, Texas, 4–6 February. SPE-168612-MS. https://doi.org/10.2118/168612-MS.
Datta-Gupta, A., Xie, J., Gupta, N. et al. 2011. Radius of Investigation and its Generalization to Unconventional Reservoirs. J Pet Technol 63 (7): 52–55. SPE-0711-0052-JPT. https://doi.org/10.2118/0711-0052-JPT.
Fisher, M. K., Heinze, J. R., Harris, C. D. et al. 2004. Optimizing Horizontal Completion Techniques in the Barnett Shale Using Microseismic Fracture Mapping. Presented at the SPE Annual Technical Conference and Exhibition, Houston, 26–29 September. SPE-90051-MS. https://doi.org/10.2118/90051-MS.
Gringarten, A. C., Ramey, H. J. Jr., and Raghavan, R. 1974. Unsteady-State Pressure Distributions Created by a Well With a Single Infinite-Conductivity Vertical Fracture. SPE J. 14 (4): 347–360. SPE-4051-PA. https://doi.org/10.2118/4051-PA.
Hazlett, R. D. and Babu, D. K. 2014. Discrete Wellbore and Fracture Productivity Modeling for Unconventional Wells and Unconventional Reservoirs. SPE J. 19 (1): 19–33. SPE-159379-PA. https://doi.org/10.2118/159379-PA.
Jacobs, T. 2014. The Shale Evolution: Zipper Fracture Takes Hold. J Pet Technol 66 (10): 60–67. SPE-1014-0060-JPT. https://doi.org/10.2118/1014-0060-JPT.
Kuchuk, F., Biryukov, D., Fitzpatrick, T. et al. 2015. Pressure Transient Behavior of Horizontal Wells Intersecting Multiple Hydraulic and Natural Fractures in Conventional and Unconventional Unfractured and Naturally Fractured Reservoirs. Presented at the SPE Annual Technical Conference and Exhibition, Houston, 28–30 September. SPE-175037-MS. https://doi.org/10.2118/175037-MS.
Kuchuk, F., Morton, K., and Biryukov, D. 2016. Rate-Transient Analysis for Multistage Fractured Horizontal Wells in Conventional and Un-Conventional Homogeneous and Naturally Fractured Reservoirs. Presented at the SPE Annual Technical Conference and Exhibition, Dubai, 26–28 September. SPE-181488-MS. https://doi.org/10.2118/181488-MS.
McCann, R., Hazlett, R. D., and Babu, D. K. 2001. Highly Accurate Approximations of Green’s and Neumann Functions on Rectangular Domains. Proc. Royal Soc. A 457: 767–772. https://doi.org/10.1098/rspa.2000.0690.
Sierra, L. and Mayerhofer, M. 2014. Evaluating the Benefits of Zipper Fracs in Unconventional Reservoirs. Presented at the SPE Unconventional Resources Conference, The Woodlands, Texas, 1–3 April. SPE-168977-MS. https://doi.org/10.2118/168977-MS.
Van Poolen, H. 1964. Radius-of-Drainage and Stabilization-Time Equations. Oil Gas J. September: 138–146.