A Study On The Transport Of Emulsified Viscosity Pipe In Liaohe Heavy Oil

With the constant exploitation of conventional crude oil resources,the development of heavy oil is of great significance for alleviating the shortage of crude oil resources.In the world,heavy oil resources are abundant,and occupy an important position in the energy structure.As a special crude oil,heavy oil has many disadvantages,such as high viscosity,high density and poor mobility,which brings many difficulties to heavy oil production and transportation.Heavy oil emulsification and viscosity reduction transport is one of the effective ways to solve the heavy oil transportation problem.Because of its low development amount and low cost,the heavy oil has attracted much attention from the world oil industry.First of all,this paper takes the heavy oil of Qi 40 block in Liaohe Oilfield as the research object.Through the laboratory experiment,the composition of four components,the viscosity temperature characteristics and the temperature variation characteristics of the heavy oil samples are determined by the physical property analysis.According to the viscosity reduction rate and static stability index,we selected 6 different emulsifying viscosity reducers.Experiments show that the non-ionic-anionic viscosity reducer has the best viscosity-reducing effect and the average viscosity-reducing rate is 74.54%.The non-ionic viscosity-reducing agent has the best static stability,and the SV value is 16.75.On this basis,the compounding experiment of emulsifying viscosity reducer was carried out and the alkali agent was screened;the orthogonal experiment was designed to determine the compounding proportion of each viscosity reducer;the factors such as emulsification temperature,oil-water ratio and agitation strength were changed to optimize the best adaption conditions.The results showed that at an experimental temperature of 50?,the viscosity-reducing agent formulation was 0.75% wt non-ion-anion,0.25% wt non-ionic,0.5% wt sodium hydroxide according to an oil/water ratio of 7:3,resulting in a viscous oil emulsion.The liquid effect was the best,the viscosity reduction rate reached 97.2%,and the SV value reached 18.4.Secondly,the influence of O/W emulsion on the rheology during tube transmission is studied,and the rheological equation is simulated,and the friction pressure drop of the pipe flow is further analyzed through a suitable rheological model.It is found that the oil / water ratio is the main factor affecting the viscosity coefficient K value of the rheological equation of the emulsion,and the oil / water ratio and the emulsifying temperature are the main factors that affect the non Newtonian property of the emulsion and the friction pressure drop of the tube flow.Finally,the synergistic effect of formula compound system was verified by the microscopic characterization methods such as oil water interfacial tension meter,infrared spectrometer and polarizing microscope.The apparent model and particle size distribution of emulsion were observed and the mechanism of viscosity reduction was explored by analyzing the infrared spectra of viscous oil before and after viscosity reduction.