Comparative Analysis of the Waterflooding Efficiency Calculating Methods
- Ivan Arsenevsky (Modeling Technologies Center) | Maria Belyanushkina (Modeling Technologies Center) | Rustem Gareev (Modeling Technologies Center) | Andrey Gladkov (Modeling Technologies Center) | Danila Kondakov (Modeling Technologies Center) | Anton Lvov (Modeling Technologies Center)
- Document ID
- Society of Petroleum Engineers
- SPE Russian Oil and Gas Exploration and Production Technical Conference and Exhibition, 16-18 October, Moscow, Russia
- Publication Date
- Document Type
- Conference Paper
- 2012. Society of Petroleum Engineers
- 5.5 Reservoir Simulation, 5.4.1 Waterflooding, 2.2.2 Perforating, 4.3.4 Scale, 1.6 Drilling Operations, 1.14 Casing and Cementing
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The traditional waterflood management practice during the oil field development is to divide the production targets into blocks / elements / patterns. This allows us to estimate reservoir and production parameters, to identify problem blocks and plan for well activities, improving the reservoir development efficiency.
The input data for calculating key indicators of block energy state and waterflood performance are related to production and injection per blocks. Therefore, the cornerstone is the production / injection allocation for the wells located on boundaries of several blocks.
Generally, production / injection is allocated using the geometrical technique, where the contribution of a boundary wells into each block (described by an allocation factor) is proportional to the angle, open to flow in this well into the block. Furthermore, this proportion is retained during the entire field life. However, the development practice shows that actual allocation factors may differ significantly from the numbers, predicted by the geometrical approach. Moreover, these factors dynamically change over time with changes in performance of the wells, located inside the block.
In this paper, we describe the results of a comparative analysis on various static and dynamic techniques for calculating well allocation factors. We determined the limitations of various methods and estimated the performance factor accuracy for different waterflooding patterns.
Waterflooding efficiency can be estimated at different levels of surveillance: from the entire field to a well level (field - waterflooding block - waterflooding pattern - well). Analysis at the reservoir level allows us to review all zones, but the number of parameters in this case can be too large for an adequate assessment; the well level provides some details, but in this case we can lose a full-scale vision of the system. The waterflooding block or pattern level allows examination of an acceptable number of parameters [1, 2, 3]. In this paper we propose an approach to divide a model into blocks / waterflooding elements. Previous publications  describe analytical tools for waterflooding surveillance at each level, including block-level monitoring. The basis for success in this case is related with proper allocation of boundary wells' production per blocks.
The results of this study were introduced on a real field. The target of research was a field with a five-spot pattern, converted into a nine-spot by the infill drilling.
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