Optimizing Scale Management in The Buzios Field: Application of Acid Squeeze and Sequential Acid-Scale Inhibitor Treatments

Abstract Buzios, a supergiant ultra-deepwater field operated by Petrobras, has faced significant inorganic scale challenges since 2018. The specificity composition of its formation water combined with high well flow rates makes applying conventional chemical treatments even more difficult. This prompted the creation of an effective adsorption isotherm for scale management, since traditional methods were inadequate. In response to these operational challenges, laboratory experiments were designed to evaluate the effectiveness of organophosphonates in their acid form and sequential acid and scale inhibitor squeeze treatments. These experiments specifically aimed to assess the risk of scale inhibitor precipitation during the shut-in period, which can last ten days or more. This study provides a comprehensive overview of advancements and methodologies used in acid jobs and scale inhibitor squeeze treatments in the Buzios carbonate field, including detailed laboratory data and case studies that illustrate operational challenges and innovative solutions implemented during remote operations. The primary objective was to demonstrate the effectiveness and technical progress of these treatments in improving field productivity while effectively addressing inorganic scale issues. The operational data indicate that acid squeeze inhibitors, combined with sequential acid and scale inhibitor treatments, offer substantial economic advantages over traditional methods. In fact, by decreasing the number of treatment stages, these approaches not only improve operational efficiency, but also contribute to reducing carbon dioxide emissions, aligning with sustainability goals in the oil and gas industry. This is particularly significant given the increasing emphasis on environmental responsibility and sustainable practices in the sector. This paper emphasizes the essential role of chemical treatments in ultra-deepwater oilfields, with insights from successful applications in the Buzios field demonstrating their potential to improve well performance and productivity and ensure sustainability in scale management. By combining advanced chemical strategies while addressing operational challenges, this research delivers practical solutions that drive innovation in oilfield chemistry and support the advancement of industry best practices. The methodologies and insights presented improve understanding of scale management and provide a foundation for more efficient, sustainable, and environmentally responsible hydrocarbon extraction in ultra-deepwater operations.