Preventing polymer precipitation in cEOR

Typically, when choosing a polymer for cEOR, the main focus is on identifying a product that delivers the best sweep efficiency in the reservoir, and the effect of the polymer composition on the produced water process receives less attention. During the time in the reservoir, the polymer's chemical composition changes. If this is not considered beforehand, the back-produced polymer might precipitate in the separation processes.

Preventing polymer precipitation in cEOR

A group of Kemira’s R&D experts ran a series of experiments to study what happens to the polymer during polymer flooding, and how the back-produced polymer behaves in the surface facilities, depending on time, temperature, and polymer and brine compositions.

In this 16-minute presentation, our Research Scientist Brita Peltokoski explains how the polymer’s chemical properties change in the reservoir, and how the consequent precipitation risk can be mitigated already in the polymer selection phase.

The results of the research were first presented at the 30th Oil Field Chemistry Symposium, organized by The Norwegian Society of Graduate Technical and Scientific Professionals in March 2019. The presentation was awarded by the organizer as the best scientific paper of the symposium.


Brita Peltokoski

Brita Peltokoski

Research Scientist, R&D and Technology

Espoo, Finland


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