Enhanced oil recovery by CO2 injection is a common application used for light oil reservoirs since CO2 is relatively easily miscible with light oils. CO2 flooding in heavy oil reservoirs is often uneconomic due to unfavorable mobility ratios. Reservoir heterogeneity further complicates the process as CO2 channels through high permeability layers leading to premature breakthrough. However, this can be controlled by choosing a suitable modification to the CO2 injection process enabling better sweep efficiencies, and making the process economic. The current work focuses on two such methods; water-alternating-gas injection (WAG) and profile modification by blocking gas flow in the high permeability layer. These methods were studied for physical mechanisms of oil recovery, increasing sweep efficiency, and mitigating premature breakthrough. Reservoir simulation studies of these methods were conducted using an analog heavy oil (14° API) field with a high permeability streak which had 50 times greater permeability than the adjacent zones. A detailed fluid characterization was performed to accurately represent the reservoir fluid. Slim tube and core flood simulations were interpreted to understand the physical mechanisms of oil recovery for this crude. Profile modification using a blocking agent showed very encouraging results. Different WAG ratios were also evaluated, and a WAG ratio of 1:1 resulted in the highest oil recovery which was consistent between both core flood simulations and field simulations. This is different from WAG ratios for highest recovery in light oil reservoirs where values of 1:2 are typically seen. It is shown that with careful study of the reservoir geology and fluid properties, application of these methods can significantly improve sweep efficiency and oil recovery in heavy oil floods.
| Identifer | oai:union.ndltd.org:LSU/oai:etd.lsu.edu:etd-04282011-104818 |
| Date | 28 April 2011 |
| Creators | Nagineni, Venu Gopal Rao |
| Contributors | Radonjic, Mileva, Hughes, Richard G., White, Christopher D. |
| Publisher | LSU |
| Source Sets | Louisiana State University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lsu.edu/docs/available/etd-04282011-104818/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached herein a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to LSU or its agents the non-exclusive license to archive and make accessible, under the conditions specified below and in appropriate University policies, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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