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Successful Polymer Pilot Boots 1P, 2P, 3P Reserves in CGSJ: Four Converging MethodsNormal access

Authors: J. Juri, F. Schein, A. Ruiz, V. Serrano, M. Thill and P. Guillen
Event name: IOR 2019 – 20th European Symposium on Improved Oil Recovery
Session: Pilot & Field Cases
Publication date: 08 April 2019
DOI: 10.3997/2214-4609.201900059
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 4.82Mb )
Price: € 20

Summary:
Reliable estimation from successful polymer pilots to multiple expansion scenarios (full-field and analogs) are of fundamental importance for booking polymer flooding reserves. Here we propose a methodology of four methods (geometrical WOR vs. Np, volumetric, ratio 1P waterflooding to P1 polymer flooding and numerical simulation) to estimate 1P, 2P, and 3P using multiple sources of information. Our results developed criteria to jointly define 1P, 2P and 3P reserves from a successful pilot implemented in Cuenca Golfo San Jorge. These four methods approach makes it easy to cross-check the key parameters that describe the efficiency of polymer flooding, i.e., displacement efficiency, volumetric efficiency. Therefore, they verified the consistency of the results. In addition, the results provide an estimation of the variability that allowed us to add additional criteria to determine 1P, 2P and 3P reserves. Our studies reveal new aspects of practical usage of the WOR vs Np approach for polymer flooding which need to be taken into consideration for booking reserves. The geometric WOR vs Np method is scale invariant, namely it can be applied with consistency across multiple group of well through the reservoir. We validated this approach with the results of the pilot and testing it with multiple scenarios generated by the simulator. The results obtained in terms of recovery factors throughout different layers and zones in the reservoir agreed well with the upscaled recovery factor obtained in multiple corefloods


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