Diluent blending-viscosity reduction technology is an important method for heavy oil exploitation. For conventional diluent blending-viscosity reduction technology, many disadvantages such as large amount of light oil and poor thermal conductivity limit its development in the oil field. In this paper, nano-molybdenum disulfide (MoS₂) with excellent thermal conductivity was added into diesel to improve the thermal conductivity of light oil, and the stability of MoS₂/diesel dispersion was improved by adding the dispersant. The effect of diluent blending-viscosity reduction technology was evaluated using MoS₂/diesel dispersion as light oil system. The results showed that the dispersion effect of ultrasonic cell crusher was better than that of a homogenizer and ultrasonic cleaner; the stability of MoS₂/diesel dispersions decrease with the increase of the dosage of nanoparticles and with temperature. A certain degree of mechanical oscillation can improve the stability of MoS₂/diesel dispersions. Compared with Span-80 and N,N-dimethylformamide, the stability was significantly improved when the concentration of succinimide ashless dispersant was 1%. The evaluation of diluent blending-viscosity reduction technology experiment shows that adding an appropriate dosage of MoS₂ can reduce the amount of light oil and improve the viscosity reduction effect at low temperature. When the blending ratio was 5% at 50°C, the viscosity reduction rate of MoS₂/diesel dispersion relative to diesel increased by 44.9%. Therefore, it is of great significance to reduce the energy consumption and increase the production of heavy oil by diluent blending-viscosity reduction technology based on oil-based nanofluids with high thermal conductivity.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Preparation of MoS₂/diesel dispersion nanofluid and its application in diluent blending-viscosity reduction technology for heavy oil production

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Preparation of MoS2/diesel dispersion nanofluid and its application in diluent blending-viscosity reduction technology for heavy oil production

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Preparation of MoS₂/diesel dispersion nanofluid and its application in diluent blending-viscosity reduction technology for heavy oil production