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• W2025804914 abstract "Abstract The use of high density brines in well completions and/or recompletions poses potential problems for initial well production. Emulsions may be formed when the crude and completion brine are commingled under high shear at points such as the perforations, well-head, chokes and valves. This commingling can lead to the production of very stable viscous brine-in-crude emulsions. Resolving emulsions can be a costly operational problem, especially in sub-sea completions. With heavy or asphaltene bearing crudes, the prevention of emulsions is even more challenging. The resulting emulsion may likely be stabilized by asphaltene precipitates. This can lead to very viscous and tight pads. These emulsions and/or pads can yield a multitude of operational problems that include: increased shorting in the separators, tripping of equipment, costly clean-up/disposal, and increased completion delays/costs. This paper describes laboratory analyses that were utilized to evaluate six (6) emulsion preventers to prevent a potential asphaltene-stabilized emulsion. Crude recovered from well tests in a recent Gulf of Mexico deep-water discovery were analyzed for composition. These crude samples were then commingled with high-density completion brine that was treated with various concentrations of selected emulsion preventers. The results were evaluated for clarity, presence of a pad, coalescence, and emulsion tendency. Emulsion preventers are specialized chemicals that rely on a soluble carrier. They must be brine soluble and this alone may pose a challenge in high-density brines. They must remain in the brine phase under downhole conditions and present themselves at the crude-brine interface, thereby, initiating the coalescence process. To simulate downhole conditions as near as possible, iron was introduced into the completion brine at various concentrations. Iron alone can cause and/or augment the severity of an emulsion. In some cases, reverse emulsions were evident. All emulsion preventers were tested in the presence of iron as a final evaluation of their performance. This study allowed the authors to introduce a new emulsion preventer for use with high-density completion brine. This non-emulsifier was utilized in four (4) recent deep-water sub-sea completions in the Gulf of Mexico and yielded favorable results. The field case histories are presented to substantiate the laboratory findings. An additional benefit derived from this study was a more efficient and rapid well clean-up after the initial completions with no system upsets." @default.
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• W2025804914 date "2002-02-20" @default.
• W2025804914 modified "2023-10-18" @default.
• W2025804914 title "Asphaltic Crudes and High Density Brines: A Potentially Lethal Combination" @default.
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• W2025804914 doi "https://doi.org/10.2118/73732-ms" @default.
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