Modelling of Cold Heavy-Oil Production With Sand For Subsequent Thermal/Solvent Injection Applications
- Alireza Rangriz Shokri (University of Alberta) | Tayfun Babadagli (University of Alberta)
- Document ID
- Society of Petroleum Engineers
- Journal of Canadian Petroleum Technology
- Publication Date
- March 2014
- Document Type
- Journal Paper
- 95 - 108
- 2014.Society of Petroleum Engineers
- 1.2.2 Geomechanics, 3.2.5 Produced Sand / Solids Management and Control, 5.4.11 Cold Heavy Oil Production (CHOPS), 5.4.7 Chemical Flooding Methods (e.g., Polymer, Solvent, Nitrogen, Immiscible CO2, Surfactant, Vapex), 2.2.2 Perforating, 2.4.3 Sand/Solids Control, 5.5.8 History Matching
- wormhole modeling, post-CHOPS EOR, dual-porosity model, steam/solvent injection, fractals
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- 788 since 2007
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Although proved beneficial and economic for thin reservoirs, the cold heavy-oil production with sand (CHOPS) method has several limitations. The sand produced during CHOPS changes the geomechanical and petrophysical properties continuously and results in open channels in the reservoir known as wormholes. Also, the CHOPS method results in a low oil recovery (8–10% original oil in place). This entails a follow-up enhanced-oil-recovery (EOR) process, which is always an option for further exploitation, referred to as post-CHOPS. Assessment of such a process through numerical simulation, as the most inexpensive yet most powerful tool, necessitates a comprehensive modelling approach to capture its dynamic physical nature. Only through such a realistic model can one obtain reasonably reliable reservoir characteristics after CHOPS that are critically important to assess post-CHOPS applications. To this end, we implemented a fractal pattern of different kinds by use of a diffusion-limited aggregation (DLA) algorithm as wormhole domain with a partial dual-porosity approach and a step-by-step simulation technique, taking advantage of a simple mathematical model to integrate the sand-production data with fractal patterns. The wormhole network is assumed to grow with more sand production, respecting geological conditions and well perforation. Moreover, its effective properties and the contained fluid can be controlled along its length and pattern at different steps. Such an option is of great assistance in the history-matching process. The model was validated successfully with available Alberta field data. As a preliminary step to post-CHOPS, several thermal, solvent, and hybrid combinations of both scenarios were considered. The proposed method for CHOPS modelling is a useful approach to initiate a quick post-CHOPS study in practice if sand production history is provided. One may also take advantage of its compatibility with any black-oil, compositional, or thermal simulators.
|File Size||3 MB||Number of Pages||14|
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