Comparing Different Scenarios for Thermal Enhanced Oil Recovery in Fractured Reservoirs Using Hybrid (Solar-Gas) Steam Generators, A Simulation Study
- Mohsen Mirzaie Yegane (Sharif University of Technology) | Farzad Bashtani (PERM Inc; Digital Core Analysis Laboratory, University of Calgary) | Ali Tahmasebi (Petroleum University of Technology) | Shahab Ayatollahi (Sharif University Of Technology) | Yahya Mansoor Al-wahaibi (Sultan Qaboos University)
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- Society of Petroleum Engineers
- SPE Europec featured at 78th EAGE Conference and Exhibition, 30 May-2 June, Vienna, Austria
- Publication Date
- Document Type
- Conference Paper
- 2016. Society of Petroleum Engineers
- 4.1.5 Processing Equipment, 5.4.6 Thermal Methods, 5.5 Reservoir Simulation, 5 Reservoir Desciption & Dynamics, 5.4 Improved and Enhanced Recovery, 5.4 Improved and Enhanced Recovery
- Solar Generated steam, Simulation Study, Economical and Environmetal study, Fractured Reservoir, Thermal EOR
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The application of the renewable energy sources, especially solar energy, for thermal enhanced oil recovery methods as an economical and environmental valuable technique has received many attractions recently. Concentrated Solar Power systems are capable of producing substantial quantities of steam by means of focused sunlight as the heat source for steam generation. This paper aims to investigate viability of using this innovative technology in fractured reservoirs to generate steam instead of using conventional steam generators.
A synthetic fractured reservoir with properties similar to those of giant carbonate oil reserves in the Middle East was designed by using commercial thermal simulator. The dual porosity model was used to account for differences in matrix and fracture parameters. Different cyclic and continuous steam injection scenarios using combination of both solar energy and fossil-fuel to generate steam were designed. The cyclic scenarios were different in terms of contribution of solar energy in steam generation and in case of 100% solar scenario a small nightly steam injection using fossil-fuel was suggested to prevent flow back into the wellbore.
It was assumed that total amount of injected steam in 10 year time period is the same for all the scenarios regardless of how steam was generated. Simulation results showed that nightly injection of insignificant amount of fossil-fuel-generated-steam in a 100% solar-generated-steam injection process increases the cumulative oil production compared to 100% solar-generated-steam injection system with no nightly injection. Furthermore, there was no significant difference between the final oil recoveries for all the designed cyclic injection scenarios. Although continuous steam injection scenario had the highest final oil recovery among all scenarios, a detailed economical study showed that net present value for 100% solar-generated-steam scenario is the highest. An environmental analysis on all scenarios also indicated significant reduction of CO2 emission into the atmosphere for the latter scenario.
Therefore, hybrid steam generators which utilize solar energy instead of traditional fossil-fuel for steam generation is proposed for Middle East fractured reservoirs where there is abundance of sunshine during day time. The findings illustrate high economic efficiency of solar-generated steam injection and highlight it as a green EOR method.
|File Size||4 MB||Number of Pages||19|
A. P. G van Heel, Shell technology Oman, Muscat, Sultanate of Oman; J. N. M van Wunnik, S. Bentouati, R. Terres, Petroleum Department of Oman, Muscat, Sultanate of Oman, "The impact of daily and seasonal cycles in solar generated steam on oil recovery", SPE 129225, SPE EOR conference, 2010