An Active Method for Characterization of Flow Units Between Injection/Production Wells by Injection-Rate Design
- Kun-Han Lee (University of Southern California) | Antonio Ortega (University of Southern California) | Amir Ghareloo (University of Southern California) | Iraj Ershaghi (University of Southern California)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- August 2011
- Document Type
- Journal Paper
- 433 - 445
- 2011. Society of Petroleum Engineers
- 7.6.4 Data Mining, 5.4.1 Waterflooding, 5.1 Reservoir Characterisation
- Reservoir Description and Dynamics
- 3 in the last 30 days
- 988 since 2007
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This paper presents a novel data-mining method to characterize the flow units between injection and production wells in a waterflood, using carefully implemented variations in injection rates. The method allows the computation of weight factors representing the influence of any of the injectors surrounding a given producer. The weight factors are used to characterize the effective contribution of injection wells to the total gross production in surrounding production wells. A wavelet approach is used to design the perturbation in the injection rates and to analyze the observed variations in the gross production rates.
Tracking the contribution of injectors to various producers can help in balancing voidage replacement in waterflood optimization. A second application is reservoir characterization, in which information provided by the proposed procedure can help in mapping high-permeability flow units such as channels and fractures as well as flow barriers between wells. The method was calibrated and tested successfully for simulated line-drive and five-spot patterns with various assumed flow units and flow-heterogeneity conditions. The paper also includes a case study for a tight-formation waterflood in which the weight factors are intended to delineate the pattern of natural high-permeability channels causing preferential flows.
|File Size||1 MB||Number of Pages||13|
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