Experimental Test And Theoretical Analysis Of Solid Phase Deposition In High Waxy Condensate Gas Reservoirs In Tarim Oilfield

In the different areas of Tarim Basin,Kuqa area,Tabei area,Tazhong area condensate gas reservoirs are the phenomenon of paraffin deposition,how to predict the well in the condensate gas during the extraction process and the different temperature,,How to prevent paraffin deposition,efficient development of high waxy condensate gas reservoirs one of the important technology.In this paper,based on the characteristics of the hydrodynamic phase of the Shenmu 2 well in the Shantou Oilfield before and after the wax removal,the paper studied the hydrothermal test of the fonnation fluid before the wax removal of Shenmu 2 well,the comparison of the composition of the well flow and the expansion experiment Test,constant volume failure test test,and in the whole temperature field(-20 ??160?)for fluid viscosity,anti-condensate volume,density,deviation factor and other experimental tests,based on the understanding of the formation of fluid,Wax before the wax,the wax,the wax,the wax to be dissolved,and then the PR state equation and the mixing rules of the best,the gas-liquid three-phase And the simulation results are compared with the experimental data to provide technical support for the development of the deep condensate gas reservoir and the gas-liquid-solid three-phase mechanism research of the Tarim Oilfield Company.Through the research,this paper has achieved the following results:(1)First,the phase characteristics of the well before and after the dewaxing of the Shenmu 2 well were studied by PVT phase experiment.The simulation of the hydrodynamics of the well formation,the experiment of the flowmaking,and so on were carried out.Experimental test,the experimental results analysis;(2)The experimental study of the whole temperature field under different temperature and pressure conditions shows that the fluid inversion is easy to occur when the temperature is lower than 80 ? for the pre-wax formation fluid.Below 70 ?,the formation fluid easily reversed into the reservoir;(3)In the calculation of gas-liquid-solid phase,the fagacity parameters are introduced as the adjustable parameters to simulate the experimental results.At the same time,the composition of the paraffin wax is mainly C16 alkane,naphthenes and aromatic hydrocarbons,The percentage of crude oil is used as the parameter to fit,and the calculated result of wax deposition and paraffin deposition is smaller than that of laser experiment.(4)Based on the experimental data,the PT phase diagram of the well before and after the dewaxing of the Shenmu 2 well was calculated by using the PVTsim numerical simulation software.The wax point and the paraffin deposited shell(WDE)under different conditions were simulated and combined WDE and the actual production conditions to determine the production of paraffin deposition;(5)simulation under different temperatures,pressures before Shenmu 2 wells wax,wax formation fluids after gassed mole fraction,wax precipitation curve,and calculated the paraffin deposition shell(WDE)curve,And analyze its changing law.