Resumo

JARAMILLO ESPINOZA, Carlos  e  CISNEROS CALDERON, Raúl. Aplicación de nueva tecnología ácida no corrosiva biodegradable para limpieza de pozos petroleros de la cuenca oriente ecuatoriana. Figempa [online]. 2019, vol.8, n.2, pp.17-22. ISSN 2602-8484.  https://doi.org/10.29166/revfig.v1i2.1621.

This article demonstrates the effectiveness in the application of new non-corrosive biodegradable acid technology for oil well cleaning. For its demonstration laboratory tests were carried out on metal coupons with carbonate inlays comparing with conventional acid. Two coupons were taken, one of them was subjected to the effect of conventional 12% HCl acid while the other one to the effect of biodegradable non-corrosive acid technology. From the results obtained it was evidenced that the non-corrosive biodegradable obtained greater elimination of carbonates and less wear on the metallic coupon. The methodology applied was to immerse the test equipment in a container in contact with the noncorrosive acid technology and let it soak for a period of 24 hours. Subsequently, the test equipment was recovered by verifying the cleanliness of this by observation. In order to verify secondary reactions of biodegradable non-corrosive acid technology in contact with crude oil from the eastern basin of Ecuador, a laboratory compatibility test between both fluids was performed, observing defined phase separation, good interfacial tension and little or any adsorption on the walls of the test bottle and there was no formation of emulsions or precipitates. The results obtained from the compatibility test conclude the non-presence of secondary reactions to contact with oil. Finally, a graph of the production history of an oil well in the eastern basin of Ecuador is shown, in which it is pointed the period of time where cleaning jobs were carried out in the well with 12% HCl acid and biodegradable non-corrosive acid. From this graph we can deduce the fall and recovery of crude oil production during the two acid cleaning events carried out. The graph shows a production drop of 150 obpd with 12% HCl and a production drop of 80 obpd with the biodegradable non-corrosive acid technology, therefore, greater production in the second case. Within the conclusions it is shown that the use of biodegradable non-corrosive acid eliminates the scale present in the oil wells without causing corrosion in the mechanical equipment and with its biodegradable property facilitates field operation.

Palavras-chave : Corrosion; carbonate; scale; incrustations; biodegradable; acid; stimulation; well cleaning.

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