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- W1997702952 abstract "A model describing the transport of HCl and HFeCl(4) from a water phase to a crude oil phase and subsequent sludge formation is proposed. Crude oil phase transfer compounds (PTCs) that are basic in nature facilitate transport of acid to the crude oil phase. These crude oil PTCs are able to migrate to the acid-oil interface and form acid-base complexes that can return to the oil phase. Once in the crude phase, these protonated compounds have a propensity to form aggregates. Growth of small aggregates into larger aggregates eventually generates a precipitate known as acid-sludge. Under certain conditions the model predicts the amount of acid-sludge formed to be proportional to the acid activity, or acidity function H(0), in the water phase. This relation was confirmed experimentally. Furthermore, the total amount of phase-transported acid is proportional to the base content of the crude oil. In strong HCl formulations containing Fe(3+), the acid HFeCl(4) is formed in small amounts that can be transported to the crude oil phase. In principle, the behavior of HFeCl(4) is similar to that of HCl. It was shown that HCl and HFeCl(4) compete for basic, or receptor, sites and that exchange between these two acids is reversible. The antisludging agent dodecylbenzenesulfonic acid, DBSA, intervenes through the same mechanism; that is, it competes for receptor sites with HCl and HFeCl(4). Exchange between HCl/HFeCl(4) and DBSA was also shown to be reversible." @default.
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- W1997702952 date "2003-12-01" @default.
- W1997702952 modified "2023-09-25" @default.
- W1997702952 title "Phase transport of HCl, HFeCl4, water, and crude oil components in acid–crude oil systems" @default.
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- W1997702952 doi "https://doi.org/10.1016/j.jcis.2003.08.030" @default.
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