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Optimal Application Conditions for Variable Temperature Solvent Injection into Sands and Carbonates for Heavy-Oil and Bitumen Recovery Open Access


Other title
Solvent injection
Fractured carbonates
Heavy oil
Numerical simulation
Type of item
Degree grantor
University of Alberta
Author or creator
Leyva Gomez, Hector
Supervisor and department
Babadagli, Tayfun (Civil and Enviromental Engineering)
Examining committee member and department
Ergun, Kuru (Civil and Enviromental Engineering)
Vivek, Bindiganavile (Civil and Enviromental Engineering)
Huazhou, Li (Civil and Enviromental Engineering)
Babadagli, Tayfun (Civil and Enviromental Engineering)
Tsai, Peichun Amy (Mechanical Engineering)
Department of Civil and Environmental Engineering
Petroleum Engineering
Date accepted
Graduation date
2016-06:Fall 2016
Doctor of Philosophy
Degree level
Steam injection is the most common technique in heavy-oil/bitumen recovery. However, the emission of greenhouse gases into the atmosphere, its water requirements, and excessive operational cost associated entail finding alternative solutions. One approach is combining steam and solvent injection by taking advantage of steam injection, preheating the reservoir for a more effective solvent recovery application. In this case, the performance of subsequent solvent injection strictly depends on the temperature and pressure in the reservoir. Recent experimental studies on superheated solvent injection showed that solvent in the gas formed near the saturation line yields an optimal recovery, minimizing the asphaltene precipitation and maximizing the recovery. This research investigates this process through a numerical modeling exercise and experiments under solvent injection to formulate the optimal pressure and temperature conditions for different reservoir conditions and hydrocarbon solvents. We first report the results of numerical simulation of previous laboratory experiments performed elsewhere, in which heavy-oil was exposed to solvent vapours at high temperatures. The injection of propane into sand packs or consolidated sandstones at elevated temperatures was simulated and a sensitivity analysis was carried out to identify the key parameters in the processes. Our results and observations showed that exist a critical temperature that yields a maximum recovery and its value depends on the solvent considered and the pressure and temperature of the experiment. Next, a hypothetical field scale numerical model was constructed and the key parameters identified during the aforementioned sensitivity analysis were incorporated. Then, injection process was simulated for a two-horizontal injection/production pattern. An optimization study was performed to identify the relative contributions of the effective parameters (pressure, temperature, and injection rate) and to propose an optimal application scheme using genetic algorithm. The critical pressure and temperature yielding maximum production and highest profit considering solvent retrieval were defined for different injection rates and application scenarios. Finally, we conducted a series of dynamic experiments in which liquid solvent (propane, heptane, and distillated oil) was injected into heavy oil saturated artificially fractured Berea sandstone, Indiana limestone, and naturally fracture vuggy carbonate samples with and without pre-thermal injection. To account for the effect of wettability on the process, experiments with Berea sandstone were repeated on the samples exposed to wettability alteration (more oil-wet) process. During the experiments, hot solvent was injected continuously through artificially fractured cores followed by hot water (or steam injection) phase. The optimal temperatures for heavy oil recovery and solvent retrieval, in the subsequent hot water injection, for each kind of rock sample and type of solvent were determined. Our results showed that heavy oil recovery increase was due not only to temperature but also to the solvent carbon number. When the temperature is higher than the saturation curve, the recovery decreases and the lightest component of the heavy oil are dragged out the core by the gas stream. Additionally, it was observed that for a successful solvent retrieval by hot water injection, temperature of water should be equal to or higher than the saturation temperature of liquid solvent, retained in the rock matrix.
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
Citation for previous publication
Leyva, H., & Babadagli, T. (2011, January 1). Optimal Application Conditions for Heavy-oil/Bitumen Recovery by Solvent Injection at Elevated Temperatures. Society of Petroleum Engineers. doi:10.2118/150315-MSLeyva, H., & Babadagli, T. Optimal Application Conditions for Heavy-oil/Bitumen Recovery by Solvent Injection at Elevated Temperatures. in Journal of Petroleum Science and Engineering 110 (2013) 199-209Leyva, H., & Babadagli, T. High -Temperature Solvent Injection for Heavy-Oil Recovery from Oil Sands: Determination of Optimal Application Conditions through Genetic Algorithm. SPE Reservoir Evaluation & Engineering (SPE-169342-PA)Leyva Gomez, H., & Babadagli, T. (2014, December 8). Optimal Application Conditions of Steam-Solvent Injection for Heavy Oil/bitumen Recovery from Fractured Reservoirs: An Experimental Approach. Society of Petroleum Engineers. doi:10.2118/172901-MSHector Leyva-Gomez and Tayfun Babadagli. Hot Solvent Injection for Heavy Oil/Bitumen Recovery from Fractured Reservoirs: An Experimental Approach To Determine Optimal Application Conditions. Energy Fuels, 2016, 30 (4), pp 2780–2790 DOI: 10.1021/acs.energyfuels.6b00044Leyva Gomez, H., & Babadagli, T. Heavy Oil/Bitumen Recovery from Fracture Carbonates by Hot-Solvent Injection: An Experimental Approach to Determine Optimal Application Conditions. SPE International Heavy Oil Conference and Exhibition, held in Mangaf, Kuwait, 6-8 December 2016 (SPE-184095-MS)

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