Selezione dei tensioattivi e acidificazione delle formazioni carbonatiche
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L'iniezione di tensioattivi nel trattamento di acidificazione delle matrici carbonatiche � stata ampiamente utilizzata per modificare la bagnabilit� della roccia e ottenere bassi valori di IFT. L'ottimizzazione del tipo di tensioattivo e della concentrazione per il giacimento specifico � molto importante al fine di evitare danni alla formazione e ridurre i costi del trattamento. Abbiamo messo a punto una procedura sperimentale per selezionare il tensioattivo pi� adatto a modificare la bagnabilit� e facilitare l'acidificazione della formazione di Pekisko, in Canada, che � fortemente bagnata dal petrolio e presenta un petrolio ad alta viscosit�. Sono stati testati cinque tensioattivi, di cui tre cationici, uno anfotero e uno fluorurato. Sono state effettuate misurazioni della tensione interfacciale con diversi tipi/concentrazioni di tensioattivi in salamoia con il petrolio e xilene, della concentrazione micellare critica di ciascun tensioattivo, delle caratteristiche di solubilit� dei tensioattivi, della compatibilit� degli additivi chimici, della bagnabilit� del campione dopo il trattamento con tensioattivi e dell'inondazione del campione in laboratorio per simulare l'acidizzazione della matrice. Dai risultati ottenuti abbiamo osservato che Aromox, un tensioattivo a base di ammina, era il pi� adatto per il trattamento di acidizzazione della matrice della formazione Pekisko.
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