Inferences of Two Dynamic Processes on Recovery Factor and Well Spacing for a Shale Oil Reservoir
- Alfonso Rodriguez (Repsol Oil & Gas Canada)
- Document ID
- Society of Petroleum Engineers
- SPE Liquids-Rich Basins Conference - North America, 7-8 November, Odessa, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2019. Society of Petroleum Engineers
- Well Spacing, Frac Hits, Hydraulic Fracturing, Recovery Factor, Reservoir Simulation
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- 532 since 2007
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Current industry trend of "manufacturing" approach to develop unconventional shale reservoirs would make the journey to reach an optimized solution long by considering the historical deployment of current and emerging technologies in the last decade in North America. The basic premise is that "it is not possible to optimize what it is not fully understood". Significant research and the deployment of multiple technologies by the industry, academia and governments around the world are contributing to improve our understanding of how to develop unconventional shale reservoirs. However, key challenges remain that are fundamental to be addressed to reach an optimized development and it would require a " different mindset" to be able to develop effectively unconventional shale reservoirs. Technologies deployed to develop unconventional shale reservoirs should be subdivided based on two dynamic processes. The first dynamic process is occurring during the hydraulic fracture generation and the second dynamic process is during the production phase. The first dynamic process plays a vital role that influences the second dynamic process. The main scope of this paper is to assess recovery factor distribution and well spacing for a shale oil reservoir considering both dynamic processes.
The Current work is based on the utilization of Kinetix-Intersect; modeling results were compared to Stimplan for a selected stage and rate transient analytical results. Highly complex heterogeneous hydraulic fractures are created during the first dynamic process resulting in variable areal and vertical pressure distribution and flow anisotropy occurred during the second dynamic process or production phase. Kinetix-Intersect model results indicated a variable recovery factor distribution after 30 years of production, 8.9% in the near-wellbore dynamic nano-darcy region, 2% and 1.7 % for the inter-hydraulic fracture and external feeder regions respectively for the shale oil producer evaluated. Kinetix-Intersect model results indicated that about 2/3 of total hydrocarbons produced are contributed by the near-wellbore dynamic nano-darcy and inter-hydraulic fracture regions and the remaining 1/3 by the external feeder region. Acknowledging the variability of recovery factor distribution and pressure depletion associated to the producer drainage area should be the basis for the potential implementation of Enhanced Oil Recovery (EOR) techniques.
For the shale oil producer analyzed in this study, current model results indicate an asymmetrical shape drainage area and a variable well spacing in the range of 350 to 400 meters based on displacement efficiency and non-uniform recovery factor distribution. From a pressure depletion perspective, the estimated well spacing should be at least 400 meters. However, an optimum full field development would require the consideration to implement variable well spacing and tailoring completion and fracture treatment designs based on timely identification of areal and vertical heterogeneity of static/dynamic reservoir and geomechanical drivers to optimize project economics. Streamlines were used as a drainage qualitative indicator tool to help defining well spacing criteria. In summary, the route to attain better recovery factors for unconventional shale oil reservoirs commence with the understanding and quantification of the areal and vertical pressure depletion distribution along the horizontal section of the parent wells based on both dynamic processes; this is a vital input to define a suitable well spacing and effectively deploy adaptable drilling, completion and fracture treatment designs to reduce the occurrence of detrimental ‘Frac –Hits’ and improve oil recovery for future parent-child wells. The current expected recovery factors for unconventional shale producers are suboptimal with natural depletion and the need to increase the recovery factor with the deployment of EOR technology is paramount.
|File Size||2 MB||Number of Pages||19|
Shrivastava, K., & Sharma, M. M. (2018, January 23). Proppant Transport in Complex Fracture Networks. Society of Petroleum Engineers.doi: 10.2118/189895-MS
Ugueto C. G. A,Huckabee P.T., , Molenaar M.M., ,WykerB.,&Somanchi K.,,(2016, February 1). Perforation Cluster Efficiency of Cemented Plug and Perf Limited Entry Completions; Insights from Fiber Optics Diagnostics. Society of Petroleum Engineers. doi:10.2118/179124-MS
Manchanda, R., Bryant, E. C., Bhardwaj, P., & Sharma, M. M. (2016, February 1). Strategies for Effectiw Stimulation of Multiple Perforation Clusters in Horizontal Wells. Society of Petroleum Engineers. doi:10.2118/179126-MS
Wheaton, B., Haustveit, K., Deeg, W., Miskimins, J., & Barree, R. (2016, February 1). A Case Study of Completion Effectiveness in the Eagle Ford Shale Using DAS/DTS Observations and Hydraulic Fracture Modeling. Society of Petroleum Engineers. doi:10.2118/179149-MS
SaeedRahimi-Agham, Viet-Tuan Chau, Huynjin Lee, Hoang Nguyen, WeixinLi, Satish Karra, Esteban Rougier, Hari Viswanathan,Gowri Srinivasan, Zdenek P. BaZ'ant, Branching of Hydraulic Cracks in Gas or Oil Shale with Closed Natural Fractures: How to Master Permeability, SPREE Report No. 18-10/076b, Nov 20 2018.
Rodriguez, A, Maldonado, F. (2019, April 8). Evaluating Pressure Drawdown Strategy for Hydraulically Fracture Shale Gas Condensate Producers. Society of Petroleum Engineers. doi:10.2118/195235-MS
Kumar, V., Sondergeld, C. H., & Rai, C. S. (2012, January 1). Nano to Macro Mechanical Characterization of Shale. Society of Petroleum Engineers. doi:10.2118/159804-MS
Jin, X., Zhu, D., Hill, A. D., & McDuff, D. (2019, January 29). Effects of Heterogeneity in Mineralogy Distribution on Acid Fracturing Efficiency. Society of Petroleum Engineers.doi:10.2118/194377-MS
Manchanda, R., Bhardwaj, P., Hwang, J., & Sharma, M. M. (2018, January 23). Parent-Child Fracture Interference: Explanation and Mitigation of Child Well Underperformance. Society of Petroleum Engineers. doi:10.2118/189849-MS
Wu, C.-H., & Sharma, M. M. (2019, March 1). Modeling Proppant Transport through Perforations in aHorizontal Wellbore. Society of Petroleum Engineers. doi:10.2118/179117-PA
Lindsay, G., Miller, G., Xu, T. et al. (2018). Production Performance of Infill Horizontal Wells vs. Pre -Existing Wells in the Major US Unconventional Basins. Presented at the SPE Hydraulic Fracturing Technology Conference and Exhibition, The Woodlands, Texas, USA, 23-25 January. SPE-189875-MS. 10.2118/189875-MS.
Sun, H., Thou, D., Chawathe, A, & Liang, B. (2017, July 24). Understanding the ‘Frac-Hits’ Impact on a Midland Basin Tight-Oil Well Production. Unconventional Resources Technology Conference. doi:10.15530/URTEC-2017-2662893
Jacobs, T., To Solve Frac Hits, Unconventional Engineering Must Revolve Around Them (April 2019). Society of Petroleum Engineers. doi:10.2118/0419-0018-JPT