Research On Rules Of Heavy Oil/Water Mixing Transportation And Process Design Methods

To be directed against the marked differences between design parameters and operation parameters of the subsea pipeline of O&W mix transportation in the SZ36-1 oil field, this dissertation consider that in the area of the pipeline design which is O&W mix transportation in the internal of the oil field, the applied researches into the pressure drop calculation formula for the viscosity of the O&W emulsion and the effect of phase state of O&W on pressure drop in course of transportation are relative short .So far, people still have not been cognizant of the essence and rule of O&W two-phase flow; so we could not deduce the classic calculation formula for the viscosity of the O&W emulsion and the mathematical model of the O&W two-phase flow pressure drop .the cause of the differences between the subsea pipeline design parameter of oil O&W two-phase transportation in the SZ36-1 oil field and operation parameter is that.To begin with the theory, this dissertation researched the fruits of O&W mix transportation theory by the predecessors, especially, rule of the O&W two-phase flow pattern and pressure drop. The author worked again and again experimental study, which was based on theoretical analysis: from the flow property of heavy oil to experiment on demulsified chemical; from the time effect of reducing viscosity to experiment of the effect of high speed shearing; from analysis of thermodynamics theory to the overall heat transfer coefficient of pipe-in-pipe insulated pipeline, till various elements which is affect the overall heat transfer coefficient. After that, we have acquired excellent outcome:1) Put forward simulated experiment method that researches the O&W distributed rule of the O&W transportation pipeline of heavy oil.2) Find the distributed rule of O&W which is delivered by the long distance O&W transportation pipeline of heavy oil in SZ36-1 oil field;3) Quantification the effect of application of demulsified chemical for reducing viscosity, which is based on the distributed rule of O&W in the O&W two phase transportation pipeline of heavy oil;4) Put forward that the overall heat transfer coefficient will be affected by air layer thickness of the subsea pipe-in-pipe insulated pipeline, and new recommendation range of the overall heat transfer coefficient which is 50mm thickness polyurethane foam.5) Put forward improved calculation formula of the pressure drop of the O&W two phase transportation pipeline of heavy oil;Researches thinking and method proposed by this dissertation provided scientific basis for design and research of O&W two phase transportation pipeline of heavy oil .The outcome has not only important practical value but also academic meaning.