| Autor: |
Mohamed M. Gharsalla, Georg M. Mittermeir, Christoph F. Steiner, Zoltán E. Heinemann |
| Rok vydání: |
2016 |
| Předmět: |
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| Zdroj: |
All Days. |
| DOI: |
10.2118/180122-ms |
| Popis: |
This work suggests a paradigm change. Instead of history matching an (upscaled) geological model by the reservoir engineer focusing on matching the dynamic data. The model builder should be equipped with the right tools to identify areas where the geological model cannot fulfill the dynamic requirements. The target is to make history matching obsolete. Every modification of the model must have its geological reasoning and justification. Introducing artifacts for the sole target of matching dynamic data is depreciated. Often such models lack forecasting credibility. Especially selecting infill drilling locations becomes highly uncertain. This paper presents applicable and ready to use methods which will be demonstrated on a full-field project. There are two key elements, each to be fulfilled during every timestep. At first the average (region) pressures must fit and second each well must be allowed to search for the required phases to satisfy its production targets. The first requires at least one region for which the historic pressure decline is known. At the delineation towards an outer aquifer water will be automatically injected/withdrawn to match the pressure history. The second is realized by perforations (well-grid-connections) which are allowed to move away from the well's trajectory and to search for the required phases within a user or algorithm defined drainage area. There is just one restriction. Drainage areas must not overlap. In case the drainage area does not contain the necessary fluids the geological model has to be revised. At the same time important information about fluid movements are gathered. The promoted concept was successfully applied to a North African naturally fractured carbonate reservoir having more than 500 MMstb original oil in place and a 35-years production history. The reservoir was divided into eight pressure regions. Five were selected as target for the automatic pressure match, the remaining three were control regions. Two update cycles were performed. During the first cycle the structure was corrected. Thus the phase distribution was affected so that all drainage areas could produce the required historic rates. During the second cycle local adjustments in porevolume and communication across faults were performed to increase the pressure match of the control regions. The demonstrated workflow has the potential to revolutionize the commonly practiced reservoir model creation. Up to now no similar workflow allowing to assess the geological model quality within one single simulation run was published. It is unique that pressure and production targets can be met in each timestep without corrupting the underlying geological model. Contrary the modeler is provided with the required information where and how to improve the geological model. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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