Promising Biotechnology on Selective Plugging and Wettability Alteration for Enhanced Oil Recovery

Lee, Kun Sang

doi:10.19080/ctbeb.2018.15.555918

Cited by 1 publication

(1 citation statement)

References 30 publications

(49 reference statements)

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“…In a SP binary system, polymers have a vital influence on improving the viscosity of flooding fluids, changing the direction of water flow in formations, improving the volume sweep efficiency, and reducing the adsorption of the surfactant in the reservoir rock and ultimately enhancing oil recovery. − Generally, synthesized polymers such as partially hydrolyzed polyacrylamide (HPAM) have been widely applied in commercial EOR projects benefiting from their good performances and low cost . Compared with synthetic polymers, the biopolymers produced by microorganisms inherit the characteristics of biocompatibility and biodegradation, making them capture much attention in the application of petroleum engineering .…”

Section: Introductionmentioning

confidence: 99%

Rheological Properties of a New Microbial Exopolysaccharide Produced by Sphingomonas sp. HS and Its Potential in Enhanced Oil Recovery

Miao

Zhou

et al. 2022

Energy Fuels

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The alkali-free surfactant−polymer flooding system with ultralow interfacial tensions is still a challenge to enhance oil recovery at present. In this study, a new thermally stable and salt tolerant biopolymer (HS-EPS) was obtained from thje broth of Sphingomonas sp. HS, a newly isolated strain (CGMCC No. 22954). Compared to HPAM, the elasticity of HS-EPS was dominant which is conducive to enhancing oil recovery. The HS-EPS showed good viscosity stability at salinities up to 360 g/L of NaCl, 60 g/L of Ca 2+ , and 60 g/L of Mg 2+ , temperatures up to 90 °C, and pH 4−10. Meanwhile, a new alkali-free surfactant−polymer binary system was developed using HS-EPS and a biobased surfactant newly synthesized in our laboratory. The interfacial tension between this binary flooding system and Daqing crude oil was below 10 −2 mN/m with 100 g/L of NaCl, 400 mg/L of Ca 2+ , or at a temperature of 80 °C. In addition, this binary system possesses a good oil sand adsorption resistance, dilution resistance, and aging stability. These results demonstrate that the new biopolymer HS-EPS secreted by Sphingomonas sp. HS is promising in oil recovery in the alkali-free flooding system.

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