Current state of the art for treating calcium naphthenates requires addition of large doses of acid to the production fluids. Although effective in dissolving deposits, acid treatments result in increased corrosion in production equipment, decreased oil quality and increased transport and HSE costs. Consequently, an opportunity exists for the development of non-acid inhibitors to prevent calcium naphthenate formation without the drawbacks encountered with acid treatment. In this account, we report on the discovery and development of molecules that, when injected into a production stream, prevent the formation of large scale calcium naphthenate deposits. As a result, these molecules allow for treatment of calcium naphthenate deposits without treatment with large acid dosages. The purification scheme for naphthenic acids and a novel screening test method capable of selecting highly active naphthenate inhibitors will be detailed as well as field testing results in which no deposits formed and excellent water quality was obtained.

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