Biodegradation and toxicity of scleroglucan for enhanced oil recovery

  • Zully Patricia Rodríguez Mateus Desarrollo en Tecnologías de Hidrocarburos DTH SAS, Bucaramanga, Santander, Colombia
  • Rosa Carolina Angarita Desarrollo en tecnologías de Hidrocarburos DTH SAS, Bucaramanga, Santander, Colombia
  • Jhorman Alexis Niño Gómez Ecopetrol S.A., Santander-Colombia
  • Laura Milena Corredor Ecopetrol S.A., Santander, Colombia
  • Sebastian Llanos Gallo Tecnólogos e Ingenieros de la Industria del Petróleo TIP, Bucaramanga, Santander, Colombia
  • Henderson Quintero Ecopetrol S.A., Santander, Colombia
  • Ruben Hernán Castro García Meridian Consulting, Cundinamarca, Colombia
Keywords: Biodegradation, Toxicity, Enhanced Oil Recovery (EOR), Biopolymer, Scleroglucan Biodegradación, Toxicidad, Recuperación, Mejorada de Petróleo (EOR), Biopolímero, Escleroglucano

Abstract

Polymer flooding consists of injecting polymer-augmented water into the reservoir to control the water-oil mobility ratio, resulting in an increase in the volumetric sweep efficiency compared to water flooding. Synthetic polymers (polyacrylamides) and biopolymers (scleroglucan, xanthan gum, schizophyllan) are the two families of polymers usually evaluated for enhanced oil recovery (EOR). Scleroglucan (SCG) is resistant to electrolytes, hydrolysis, pH (3-10) and temperature (30-100°C) and has remarkable rheological properties, but it is quite susceptible to microbiological degradation. The primary objective of this study was to evaluate the biodegradation of SCG in the injection and production processes and its aquatic toxicity. The anaerobic biodegradation of the SCG solutions was determined through the viscosity changes of the solutions, while the aerobic biodegradation was calculated with the changes in the SCG concentration.  It was observed that the viscosity reduction of the SCG solution was 30% and the SCG concentration decreased from 100 ppm to 52 ppm because bacteria can metabolize the biopolymer. Daphnia Pulex, Scenedesmus Acutus and Oreochromis sp. were the organisms used in the ecotoxicological assays of the SCG solutions. The acute ecotoxicological bioassays showed that there was no evidence of acute deleterious effects of SCG on any of the three organisms. From the chronic ecotoxicological bioassays, it was concluded that there was no effect of SCG on the mortality of Daphnia Pulex, regardless of the tested SCG concentration.

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How to Cite
Rodríguez Mateus, Z. P., Angarita, R. C., Niño Gómez, J. A., Corredor, L. M., Llanos Gallo, S. ., Quintero, H., & Castro García, R. H. (2022). Biodegradation and toxicity of scleroglucan for enhanced oil recovery. CT&F - Ciencia, Tecnología Y Futuro, 12(1), 5–12. https://doi.org/10.29047/01225383.403

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Published
2022-06-29
Section
Scientific and Technological Research Articles
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