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Study on the Technology of Paraffin-Controlling and Viscosity-Reduction in Crude Oil Using the Broadband-Based Ultrasonic Transducer

Author: ZhangHe
Tutor: WangWuYi
School: Harbin Institute of Technology
Course: Aviation Aerospace Manufacturing Engineering
Keywords: Ultrasonic transducer Wideband Cavitation Crude Paraffin Jiangnian
CLC: TE358.2
Type: Master's thesis
Year: 2008
Downloads: 80
Quote: 1
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Abstract

Paraffin deposition in oil exploitation in the majority of our crude oil for paraffin-based crude oil, crude oil extraction and transportation process has been a serious problem faced by the oil industry. The paraffin deposition not only hinder the normal production of the oil field, but also caused a huge waste of energy. Used paraffin removal process such as the presence of mechanical wax removal, thermal wax removal, chemical clear anti wax costs, labor-intensive, frequent wax removal and other shortcomings. Ultrasonic anti-wax viscosity reduction is a the ultrasound technology applications in the oil sector, has shown the advantages of low cost, the process is simple, non-polluting. In this paper, by ultrasonic anti-wax viscosity reduction mechanism selected based on analysis of the vibration system sound parameters, the development of the key components of the vibration system ultrasonic transducers and experimental analysis of ultrasonic anti-wax viscosity reduction mechanism. Based on analysis of paraffin deposition mechanism, respectively, from the mechanical action of the ultrasonic cavitation, emulsifying effect and thermal effect in four areas of ultrasound anti-wax viscosity reduction mechanism. Analyzes the main role of ultrasonic cavitation emulsification its secondary effects, the establishment of a single cavitation bubbles molecular dynamics model derived equations of motion of a variety of parameters under the action of cavitation bubbles simulation with Matlab and explore the ultrasound frequency, power ultrasonic cavitation for the selection of design parameters of the ultrasonic vibration system provides a theoretical basis. Anti-wax viscosity reduction using ultrasonic vibration system. Load of crude oil, the development of a new porous-type broadband transducers, modal analysis using finite element method analysis of the design of the transducer natural frequencies and modes, and verified by testing experiments transducer. item parameters, especially the band width to meet the design requirements. In the design process, by a simplified model of the porous-type transducer, the numerical simulation of the relationship curve of the band width and punch size, and provide a basis for the perforating dimensions preferred. Set up a quarter-wavelength equivalent oscillator model, analysis of a quarter-wavelength of the front cover of the boundary conditions of the transfer matrix method and the integrated use of the above two methods will be calculated in subparagraph transducer simplifies complex transducer design. The transducer developed porous wideband experimental platform as the core structures ultrasonic anti-wax viscosity reduction. Based on the experimental data analysis of the impact and the law of the ultrasonic frequency, power and duration of action of the ultrasonic effect. The method of determination of the viscosity-temperature curve, respectively, verify the cavitation reduces the role of the precipitation point of the wax and emulsifying effect with the effect of reducing the viscosity.

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