The Viability of Gas Injection EOR in Eagle Ford Shale Reservoirs
- Safian Atan (BHP) | Arashi Ajayi (BHP) | Matt Honarpour (BHP) | Edward Turek (BHP) | Eric Dillenbeck (BHP) | Cheryl Mock (BHP) | Mahmood Ahmadi (MI3 Petroleum Engineering Corp.) | Carlos Pereira (MI3 Petroleum Engineering Corp.)
- Document ID
- Society of Petroleum Engineers
- SPE Annual Technical Conference and Exhibition, 24-26 September, Dallas, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2018. Society of Petroleum Engineers
- 4.1 Processing Systems and Design, 5.4 Improved and Enhanced Recovery, 4.6 Natural Gas, 5.4 Improved and Enhanced Recovery, 4.3.4 Scale, 1.6 Drilling Operations, 4 Facilities Design, Construction and Operation, 1.6.9 Coring, Fishing, 5.7.2 Recovery Factors, 5.4.2 Gas Injection Methods, 5.3.2 Multiphase Flow, 4.1.6 Compressors, Engines and Turbines, 5.8.4 Shale Oil, 0.2.2 Geomechanics, 5.5.8 History Matching, 5.7 Reserves Evaluation, 5 Reservoir Desciption & Dynamics, 0.2 Wellbore Design
- Economics, EOR, Sensitivity Study, Unconventional, Enhanced Oil Recovery
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Gas Injection, Huff-and-Puff Enhanced Oil Recovery (EOR) technique have the potential to improve liquid hydrocarbon recovery in ultra-tight, unconventional reservoirs. This paper studies the technical and economic viability of this EOR technique in Eagle Ford shale reservoirs using natural gas injection – generally after some period of primary depletion, typically through long horizontal reach wells that were hydraulically fractured.
To achieve this, three primary steps were undertaken: First, a series of multi-well, compositional simulation models were constructed, calibrated with lab data, and history matched for an extended production period. This effort characterizes a set of equiprobable combinations of fracture and matrix properties, as well as the parametric description of the stimulated reservoir volume. Second, these history matched models were then used to numerically simulate the Gas Injection Huff-and-Puff EOR process to determine a set of optimized operational variables (operating pressures, injection pressure, cycle durations, the corresponding injection rate, and slug size). The results were also sensitized to the effect of geomechanics, containment, as well as the effect of diffusion. The primary source of information that feeds the sensitivity analysis was derived from laboratory work investigating the EOR processes at the core scale. The third and last step, economic analysis was performed using calibrated rate profiles to assess the impact of initial yield and the amount of depletion on value. Resulting analysis provided insight to the economic viability of the EOR deployment at field-scale.
Results show that the recovery factor uplift, all things being equal, is a function of the original yield, the amount of depletion, and the minimum operating pressure during the production cycles. In reality, however, equally as critical to the success of an EOR project is the formulation of the deployment strategy - the timing of the development start (forecasted price environment), pad selection, compressor scheduling, injection-soak-production durations, surveillance plans, and mitigation strategies (for poor containment and inefficient compressor utilization).
The workflow utilized in this paper both characterizes the uncertainties in an EOR project in the Eagle Ford and provides insight into operating conditions and surveillance recommendations. This is the key for a successful demonstration pilot which can then lead to a field-scale EOR deployment.
|File Size||4 MB||Number of Pages||32|
Alfarge, D., Wei, M., & Bai, B. 2017. IOR Methods in Unconventional Reservoirs of North America: Comprehensive Review. Presented at the 2017 SPE Western Regional Meeting, Bakersfiled, California, 23-27 April. SPE-185640-MS. https://doi.org/10.2118/185640-MS.
Alharthy, N., Teklu, T., Kazemi, H., Graves, R., Hawthorne, S., Braunberger, J., & Kurtoglu, B. 2015. Enhanced Oil Recovery in Liquid-Rich Shale Reservoirs: Laboratory to Field. Presented at the 2015 SPE Annual Technical Conference and Exhibtion, Houston, Texas, 28-30 September. SPE-175034-MS. https://doi.org/10.2118/175034-MS.
Balasubramanian, S., Chen, P., Bose, S., Alzahabi, A., & Thakur, G. C. 2018. Recent Advances in Enhanced Oil Recovery Technologies for Unconventional Oil Reservoirs. Presented at the 2018 Offshore Technology Conferece, Houston, Texas, 30 April - 3 May. OTC-28973-MS. https://doi.org/10.4043/28973-MS.
Cook, D., Downing, K., Bayer, S., Watkins, H., Sun Chee Fore, V., Stansberry, M., … Peck, D. 2014. Unconventional Asset Development Work Flow in the Eagle Ford Shale. Presented at SPE Unconvetional Resources Conference, The Woordlands, Texas, 1-3 April. SPE-168973-MS. https://doi.org/10.2118/168973-MS.
Haustveit, K., Dahlgren, K., Greenwood, H., Peryam, T., Kennedy, B., & Dawson, M. 2017. New Age Fracture Mapping Diagnostic Tools-A STACK Case Study. Presented at SPE Hydraulic Fracturing Technology Conference and Exhibition, The Woodlands, Texas, 24-26 January. SPE-184862-MS. https://doi.org/10.2118/184862-MS.
Heller, R., & Zoback, M. 2014. Adsorption of methane and carbon dioxide on gas shale and pure mineral samples. Journal of Unconventional Oil and Gas Resources 8(12), pp14-24. https://doi.org/10.1016/j.juogr.2014.06.001.
Hoffman, B. T. 2018. Huff-N-Puff Gas Injection Pilot Projects in the Eagle Ford. Presented at SPE Canada Unconventional Resources Conference, Calgary, Alberta, Canada, 13-14 March. SPE-189816-MS. https://doi.org/10.2118/189816-MS.
Jones, F.O., and Owens, W.W. 1980. A Laboratory Study of Lowe-Permeability Gas Sands. J. Pet. Tech. 32 (9): 1630-1640. SPE-7551-PA. https://doi.org/10.2118/7551-PA
Kazemi, H., Gilman, J. R., & Elsharkawy, A. M. 1992. Analytical and Numerical Solution of Oil Recovery from Fractured Reservoirs with Empirical Transfer Functions (includes associated papers 25528 and 25818). SPE Res Eng 7(02):219-227. SPE-19849-PA. https://doi.org/10.2118/19849-PA.
Mayerhofer, M. J., Lolon, E., Warpinski, N. R., Cipolla, C. L., Walser, D. W., & Rightmire, C. M. 2010. What Is Stimulated Reservoir Volume? SPE Prod & Oper 25(01):89-98. SPE-119890-PA. https://doi.org/10.2118/119890-PA
Orangi, A., Nagarajan, N. R., Honarpour, M. M., & Rosenzweig, J. J. 2011. Unconventional Shale Oil and Gas-Condensate Reservoir Production, Impact of Rock, Fluid, and Hydraulic Fractures. Presented at SPE Hydraulic Fracturing Technology Conference and Exhibition, The Woodlands, Texas, 24-26 January. SPE-140536-MS. https://doi.org/10.2118/140536-MS.
Rassenfoss, S. 2017. Shale EOR Works, But Will It Make a Difference? SPE J Pet Technol 69(10):34-40. SPE-1017-0034-JPT. https://doi.org/10.2118/1017-0034-JPT
Settari, A. 2002. Reservoir Compaction. SPE J Pet Technol 54(8):62-69. SPE-76805-JPT. https://doi.org/10.2118/76805-JPT
Texas Railroad Commision. 2018. Eagle Ford Shale Information, http://www.rrc.state.tx.us/oil-gas/major-oil-and-gas-formations/eagle-ford-shale-information/ (accessed 17 January 2018)
Widmyer, R. H. 1987. Use of Monitor Observation Wells in the Monitoring and Evaluation of Oil Recovery Projects. SPE J Pet Technol 39 (8):967-975. SPE-14956-PA. https://doi.org/10.2118/14956-PA.
Yu, W., & Sepehrnoori, K. 2013. Simulation of Gas Desorption and Geomechanics Effects for Unconventional Gas Reservoirs. Presented at SPE Western Regional & AAPG Pacific Section Meeting 2013 Joint Technical Conference, Monterey, California, 19-25 April. SPE-165377-MS. https://doi.org/10.2118/165377-MS