Microemulsion-Based Flushing Fluid for Effective Removal of Filter Cake in Well Cementation

    October 2019 in “ Brazilian Journal of Petroleum and Gas ”
    F. Curbelo, Thaine T. Caminha, Alfredo Ismael Curbelo Garnica, G. N. A. Melo, Edson de Andrade Araújo, Júlio Cézar de Oliveira Freitas
    Studysummary This study evaluated a microemulsion-based flushing fluid made with castor oil that effectively removed 84.85% of mud cake formed by drilling fluid, highlighting its Newtonian fluid behavior and high wettability inversion capability. Our plain-language summary of this paper — not a Tressless recommendation.
    The study aimed to assess the effectiveness of a microemulsion-based flushing fluid in removing mud cake formed by drilling fluid during well cementation. The microemulsions were composed of vegetable castor oil, 2%wt KCl as the aqueous phase, and a nonionic surfactant (Ultranex NP40). The research evaluated thermal stability, rheological properties, removal efficiency, and wettability inversion. The microemulsions exhibited Newtonian fluid behavior. The optimal formulation consisted of 70% surfactant, 25% oil phase, and 5% aqueous phase, achieving a cloudy temperature of 365.25 K, a mud cake removal efficiency of 84.85%, and a high capability for wettability inversion.
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