CaSO4 is one of major scales experienced in HTHP oilfield during seawater breakthrough. Inhibitor squeeze treatments have been regularly carried out to prevent CaSO4 scale depositions in reservoir. Some of the traditional scale inhibitors had experienced a relatively short squeeze life.This paper outlines the idea of how the new inhibitor chemistry was developed and how a special monomer was introduced to enhance the inhibitor adsorption property since it carries a special function group to have a good affinity to the reservoir rock. In addition, the environmental property of the polymer was also improved due to the introduction of the special monomer. A series test, including water compatibility, thermal stability, dynamic loop test, coreflood test were carried out and the inhibitor showed an excellent efficiency for calcium sulphate scale inhibition and squeeze life under the test conditions.The paper also presents field application data, treatment design strategy and deployment.

Development of an environmentally friendly new polymer inhibitor for calcium sulphate for HTHP squeeze application

244th National Meeting (2012)

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