Расчетно-аналитическая модель CO₂/H₂S-коррозии и дозирования ингибитора с учетом формирования FeCO₃

Цель настоящего исследования заключалась в разработке расчетно-аналитической модели для предварительной оценки CO₂- и смешанной CO₂/H₂S-коррозии углеродистой стали на объектах наземной подготовки нефти и определения ориентировочной концентрации ингибитора в водной фазе. Базовую скорость коррозии предложено рассчитывать по упрощенной зависимости де Ваарда – Мильямса, а pH использовать как диагностический параметр и для независимого сопоставления с NORSOK M-506. Влияние H₂S учитывается параметрически с учетом зависимости коррозии от pH, температуры, времени экспозиции и состояния FeS-пленки. Гидродинамический фактор задается через напряжение сдвига на стенке и параметры массопереноса, соответствующие рассматриваемой геометрии. Блок FeCO₃ включает расчет ионной силы, условного произведения растворимости K_sp(T,I) и отношения насыщения; для минерализованных вод предусматривается дополнительная проверка химической специации и активностей ионов. Термодинамическое пересыщение отделено от кинетики нуклеации и формирования защитной пленки. Дозировка ингибитора представлена нормированной величиной Ψ = C__req/C₅₀,eff. В девяти расчетных точках значения по упрощенной зависимости оказались в 2,6–5,9 раза ниже NORSOK M-506 при напряжении сдвига 19 Па. Предложенная нами модель предназначена для сценарного анализа и планирования объектной калибровки, а не для автономного назначения промышленной дозировки. Основной диапазон применения — 20–60 °C; расчеты при 60–90 °C требуют обязательного учета FeCO₃.

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