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Abstract

Summary

With respect to maximising recovery and optimising a field's value, Chemical Enhanced Oil Recovery (CEOR) especially with polymers is frequently an option. This method was identified as a promising method to enhance production from Germany's largest oil field Mittelplate. The field presents challenging operational conditions with respect to surface, subsurface, and environmental constraints. This paper describes the upscaling of lab results to field scale as well as results from a conducted injection field test.

A stepwise scale up from lab to field was performed. On the lab scale, the selection process for this field was presented (EAGE Annual 2018).

Because the subsurface injectivity for polymer solutions of the anticipated target reservoir was unknown, an injection test was planned. Due to the unknown injection parameters for the test, a mixing unit was constructed based on the results from the pilot plant tests. The main criteria for the design were operational safety considerations and high flexibility with respect to flow rates and mixing energy while maintaining a high quality of the mixed polymer solution with produced water.

At the pilot plant scale, continuous mixing tests with equipment from different suppliers and different setups were carried out for rates up to 600 l/h. A yard test of the mixing unit using field injection water generated valuable lessons, which completed the onshore evaluation for offshore field application.

In the 3rd quarter 2017, an injection test on Mittelplate Island was carried out. The test was conducted with produced water (190 g/1) without any special treatments sourced from the injection water system. The solution quality was very good and injectivity was above expectations. No plugging behaviour and no significant shear degradation of the injected solution was observed which confirms lab results regarding an excellent shear stability of the mixed polymer solutions. The injection index of the injector was well preserved.

Overall the test proved the applicability of the selected chemical system with high salinity injection water on Mittelplate.

© EAGE Publications BV
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/content/papers/10.3997/2214-4609.201900082
2019-04-08
2024-04-20

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References

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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201900082
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Injection Test as Milestone for the Applicaton of Polymer Flooding in the German North Sea
Conference Proceedings 2019, 1 (2019); https://doi.org/10.3997/2214-4609.201900082
/content/papers/10.3997/2214-4609.201900082
/content/papers/10.3997/2214-4609.201900082
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