Extension of Dykstra-Parsons Model of Stratified-Reservoir Waterflood To Include Advanced Well Completions
- Khafiz Mikhailovich Muradov (Heriot-Watt University) | Bona Prakasa (Heriot-Watt University) | David Davies (Heriot-Watt University)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- August 2018
- Document Type
- Journal Paper
- 703 - 718
- 2018.Society of Petroleum Engineers
- Dykstra-Parsons method, Vertical Sweep Efficiency, Waterflood Modelling and Analysis, Inflow Control Technology, Advanced Wells
- 3 in the last 30 days
- 295 since 2007
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Large volumes of oil are being produced by waterflooding heterogeneous reservoirs. Careful flood-pattern design, well placement, and control are required to maximize oil recovery by delaying water breakthrough and optimizing sweep efficiency. Models that analyze the waterflood’s performance and predict the production forecast, such as the Dykstra-Parsons (DP) method, are routinely used for this purpose.
The DP method estimates the vertical-flooding efficiency between conventional wells producing from noncommunicating layers. This method and its various modifications have had a significant impact on the development of the theoretical description of the waterflooding process. The DP method is still routinely used for waterflood-performance prediction and analysis, flood-pattern selection, and recovery-factor calculation.
Advanced well completions (AWCs) control the fluid flow at the reservoir sandface. They have become a proven, widely used technology (particularly in waterflooded reservoirs) for modifying a production or injection well’s inflow/outflow rate profile along the well. In addition to this, new AWC designs that react to water breakthrough have recently become available. Incorporating a description of the AWC performance into the waterflood-analysis models will allow fast forecasting of the production profile and oil recovery, as well as help in optimizing the AWC configuration and control at the well-design stage.
This work extends the DP method for rapid prediction of the waterflood’s performance to AWC wells. It provides a simple means of estimating the additional, long-term value derived by controlling zonal flow rate using AWCs or any other means (e.g., well workover). The accuracy of the extended DP method’s prediction has been verified by comparison against the results from a numerical reservoir simulator. Several examples illustrate the extended DP model’s performance and value. The method’s limitations and possible future extensions are also discussed.
The presented model is a simple, transparent approach to evaluating the impact on the waterflood’s oil recovery efficiency (RE) of various well-completion and control options. It can be implemented as an analytical model or as a fast simulator. This model is also the missing link between the various AWC design methods available today and the AWCs’ long-term value evaluation.
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