Applications of Rate and Pressure Transient Analysis in Huff-n-Puff Gas EOR for Unconventional Reservoirs
- Behjat Haghshenas (Reservoir Diagnostics Inc.) | Farhad Qanbari (Seven Generations Energy)
- Document ID
- Society of Petroleum Engineers
- SPE Improved Oil Recovery Conference, 31 August - 4 September, Tulsa, Oklahoma, USA
- Publication Date
- Document Type
- Conference Paper
- 2020. Society of Petroleum Engineers
- 5.6.3 Pressure Transient Analysis, 5.6.3 Pressure Transient Testing, 5 Reservoir Desciption & Dynamics, 3 Production and Well Operations, 5.1 Reservoir Characterisation, 5.4 Improved and Enhanced Recovery, 2 Well completion, 5.4.2 Gas Injection Methods, 5.2 Reservoir Fluid Dynamics, 5.4 Improved and Enhanced Recovery, 5.6 Formation Evaluation & Management
- Rate and Pressure Transient Analysis, Gas Huff and Puff, Montney, Tight and Shale Reservoirs, Enhanced Oil Recovery
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Gas injection huff and puff (HnP) has been successfully applied in parts of Eagle Ford over the past few years. The success is attributed to gas and oil miscibility achieved by injection of gas at high pressure and rate in a contained hydraulic fracture system with a considerable of stimulated volume. Two key preliminary steps in gas HnP modeling include characterization of reservoir fluid (and its interaction with injected gas) and evaluation of hydraulic fracture system. This study focuses on simplified analytical tools for estimation of stimulated reservoir size from production data.
Rate-transient analysis (RTA) is a tool for identification of flow regimes and estimation of key performance metrics for multi-fractured horizontal wells. The flow regimes include enhanced fractured region (EFR), bilinear flow, transient linear flow, transitional flow, and boundary-dominated flow. In this study, the size of stimulated rock and total effective fracture area are estimated using an RTA method. Further, diagnostics fracture injection tests (DFITs) and pressure buildup tests are used to characterize the multi-fractured horizontal wells for the purpose of gas EOR evaluation. Inter-well communication test is used to quantify the conductivity of connecting fractures between communication wells.
This study helps the engineers and managers with reservoir and hydraulic fracture characterization and the screening process for gas HnP candidates. The outputs of these methods serve as first pass of SRV size for more detailed numerical modeling studies.
|File Size||1 MB||Number of Pages||11|
Carlsen, M.L., Whitson, C.H., Dahouk, M.M., Younus, B., Yusra, I., Kerr, E., Nohavitza, J., Thuesen, M., Drozd, J.H., Ambrose, R. and Mydland, S., 2019, October. Compositional Tracking of a Huff-n-Puff Project in the Eagle Ford. In Unconventional Resources Technology Conference, Denver, Colorado, 22-24 July 2019 (pp. 4675–4699). Unconventional Resources Technology Conference (URTeC); Society of Exploration Geophysicists.
Clarkson, C.R., Haghshenas, B., Ghanizadeh, A., Qanbari, F., Williams-Kovacs, J.D., Riazi, N., Debuhr, C. and Deglint, H.J., 2016. Nanopores to megafractures: Current challenges and methods for shale gas reservoir and hydraulic fracture characterization. Journal of Natural Gas Science and Engineering, 31, pp.612–657.