STRATEGIES AND TECHNOLOGIES FOR MANAGING RETROGRADE CONDENSATION IN THE GAS-CONDENSATE RESERVOIRS
DOI:
https://doi.org/10.31471/1993-9868-2026-2(46)-78-96Keywords:
retrograde condensation, reservoir pressure maintenance, chemical treatments, PVT modelling, condensate recovery enhancement.Abstract
У статті узагальнено сучасні дослідження та інженерні підходи до розробки газоконденсатних родовищ із високим вмістом конденсату в пластовому газі. Показано, що розробка таких покладів на режимі виснаження пластової енергії супроводжується зниженням тиску нижче тиску початку конденсації, випадінням ретроградного конденсату, погіршенням фільтрації газу та зниженням продуктивності свердловин. Розглянуто еволюцію уявлень про ретроградну конденсацію, особливості PVT-опису газоконденсатних систем, зміну складу свердловинної продукції та вплив накопичення рідкої фази на відносну проникність для газу. Проаналізовано технології керування ретроградною конденсацією, згруповані за стадією та напрямом інженерного впливу. До методів оптимізації дренування віднесено контроль депресії тиску, горизонтальні свердловини та гідравлічний розрив пласта. Методи попередження або сповільнення випадіння ретроградного конденсату охоплюють підтримання пластового тиску нагнітанням сухого газу, азоту, діоксиду вуглецю, води та застосуванням поперемінного нагнітання води і газу (WAG — Water-Alternating-Gas). Методи мобілізації або видалення вже накопиченого ретроградного конденсату з привибійної зони включають кислотні оброблення, органічні розчинники, поверхнево-активні речовини та реагенти для зміни змочуваності породи. На основі аналізу експериментальних, чисельних і промислових даних визначено умови ефективного застосування цих технологій та їхні обмеження. За результатами узагальнення встановлених закономірностей сформовано діагностичну матрицю, яка пов’язує зміни пластового і вибійного тиску, продуктивності свердловин, конденсатогазового фактора, складу видобувного газу, скін-фактора, водного фактора та тривалості ефекту після хімічного оброблення з імовірними механізмами погіршення фільтрації газу та відповідними напрямами технологічного впливу. Запропонована матриця дає змогу систематизувати діагностичні ознаки, розмежувати ймовірні причини погіршення роботи свердловин і попередньо визначити доцільні технологічні заходи з урахуванням фактичних умов розробки покладу
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