The Prediction Of High Pressure Physical Parameters Of TLM Gas Condensate Containing Wax

In condensate gas reservoir production,to reduce the loss of condensate oil,to improve the degree of recovery,it is necessary to have accurate high pressure physical parameters,namely the phase change characteristics;Condensate from the bottom to the ground,with the loss of the temperature and pressure,there will be a paraffin deposition,which affects the normal production,so accurately predict related point and related is very necessary.Due to the limitation of equipment technical conditions,the experimental test is time-consuming and time-consuming.At the same time,the paraffin deposition in oil and gas reservoirs has always been a major technical point to be solved,and it is a necessary research subject in the petroleum industry.Therefore,in this paper,the fluid phase characteristics and paraffin deposition of TLM waxy condensate gas reservoirs are studied through theory and experiment.First of all,four blocks of TLM well flow and high pressure physical properties data were statistically analyzed,the existing prediction models on the basis of establishing new applicable to TLM waxy condensate gas reservoir physical parameters of high pressure prediction model.Secondly,on the basis of PVT phase characteristic test and paraffin deposition test,combined with the optimization equation of state and PVTsim pseudo-component method for determining the critical parameters,to simulate the YH-X well paraffin deposition,predict related situation,to ensure the normal production of condensate gas reservoir.The following understandings were mainly obtained:(1)After statistical analysis of well fluid and high pressure physical properties data of four TLM blocks,a comprehensive understanding of its phase characteristics can provide references for future production,which is of guiding significance.(2)Based on the existing prediction model,the factors influencing the gas oil ratio(single degassing oil ratio),and weakens the effect of temperature on dew point pressure,the prediction was established based on genetic algorithm TLM dew point pressure of condensate gas reservoirs under the new model,including eight factors.The error of the new model is 4.7%.(3)YH-X well is a condensate gas reservoir with low recovery degree of condensate oil and high content of reverse-condensate based on phase characteristics and solid deposition experiment test.The dewaxing point shows an upward trend with the increase of pressure.Combined with the improved PR state equation and the determination method of pseudo-component critical parameters in PVTsim,the paraffin deposition theory of high wax content condensate gas reservoirs has been further understood.(4)On the basis of solid deposition experiment,paraffin wax deposition simulation was carried out on the YH-X well,related line provides a basis to predict related situation,related chart shows that the formation fluid related amount under the condition of different pressure has only a small difference.Analysis of three phase mole fraction curve:when formation temperature is 129 ℃,there is not deposits.With the increase of pressure,gas phase decrease first and then increased,liquid instead.Therefore,this paper provides a more accurate and fast prediction model for the determination of high pressure physical parameters of TLM waxy condensate gas reservoir and a more clear understanding and guidance for the prediction of paraffin deposition in gas condensate reservoir containing wax.