A polymer injection treatment was carried out in the Beatrice field in 1985. The object of the treatment was to improve vertical sweep in the heterogeneous sands between an injector/producer pair. The process was closely monitored using a variety of standard and non-standard techniques: tracer tests, production logging, pressure interference tests before and after polymer injection, and polymer chemical analysis in produced and backflowed brine. Subsequently, a chemical simulation model was constructed and compared with the field data. It was demonstrated from the field measurements that the polymer had a clear effect on fluid flow patterns in the reservoir. However, the simulations showed that there had been a shorter distance of polymer penetration than assumed in planning the treatment, so that the watercut changes were too small to be observed. The project is significant in giving an informed picture of polymer behaviour in heterogeneous North Sea fields. It also successfully demonstrates the array of measurements needed to predict, monitor and reduce risk in polymer field applications.

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