Study On Characteristics Of LD Heavy Oil And Improvement Of Its Dilution Flow

Heavy oil has high viscosity,high density and poor fluidity,which makes it difficult to harvest and increase production costs.Therefore,it is necessary to reduce the viscosity and improve the fluidity.Heavy oil blending is one of the commonly used methods of viscosity reduction at home and abroad,but the process has the problems of large amount of thin oil,uneven mixing of thin oil and heavy oil,and even high quality of the oil due to the high wax content of the thin oil.In this respect,this paper focuses on the three aspects of the doping ratio and the doping temperature,the dosage and the addition temperature,and the viscosity-reducing ratio.Study on the viscosity reduction of heavy oil blending,and the effect of thick oil viscosity reduction when adding oil-soluble viscosity reducing agent and its compounding agent.In order to improve the viscosity reduction effect of heavy oil blending,reduce the amount of thin oil in the thinning process.The main research work and understanding are as follows:(1)Adopt relevant standard standards and supporting equipment,test and analyze the basic composition,rheological and viscosity-temperature characteristics of LD16-3S heavy oil and thin oil.The results show that heavy oil is ordinary heavy oil and the wax content is 0.61%.The wax content of the thin oil is 20.47%.Oil samples are free of water.Viscosity of heavy oil decreases with increasing temperature.When the temperature is lower than 30?,the thin oil wax crystals precipitate.(2)Experimental study of the viscosity-temperature characteristics after doping,analyze the main factors affecting the rate of viscosity reduction.The effect of dosage and additive temperature on the viscosity reduction effect of oil-soluble viscosity reducer was studied experimentally.The results show that Viscosity of the mixed oil decreases as the amount of the diluted oil is increased and the viscosity reduction rate decreases as the temperature increases.The best additive conditions for 1#viscosity reducing agent are 1600 mg/L and 40?.The best addition conditions for 2#viscosity reducing agent are 2000 mg/L and 50?.1#viscosity reducing agent has better effect on heavy oil at 30? while 2#viscosity reducing agent has better effect on heavy oil at 20?.(3)Configure diluted 10%heavy oil and change the dosing conditions and the proportion of the viscosity reducing agent,experimental study on the synergistic effect of single and complex viscosity reducers.The results show that the optimal additive conditions for 1#viscosity reducing agent are 1600 mg/L and 50? while the optimum additive conditions for 2#viscosity reducing agent are 1200 mg/L and 50?.Comparing the effect of the compounded viscosity reducing agent on the diluted 10%heavy oil under the optimal additive conditions,the FP64 viscosity reducing agent has the best effect of improving the viscosity reduction at 20? and the viscosity reduction rate is equivalent to the viscosity reduction ratio when the ratio of the mixture is 60%.The viscosity reduction effect of FP82 viscosity reducer is optimal at 30?,and the viscosity reduction rate is equivalent to the viscosity reduction rate when 40%is diluted.The effect of compounding viscosity reducer is better than that of single viscosity reducer.By compounding the viscosity reducing agent,the viscosity of the mixed oil can be reduced while reducing the dosage and the temperature of the additive.(4)Study the effect of tube flow improvement on viscosity reduction and drag reduction.Under simulated transport conditions,comparing the blending pressure before and after the improvement of the mixed oil pressure drop.Explain the improved effect of the mixed viscosity reduction and drag reduction.The results show the pressure drop of the mixed oil unit tube length can be reduced by up to 97.4%compared with the heavy oil,and can be reduced by up to 92.3%compared with the diluted 10%thick oil at 20?,and by 95.6%and 87.9%at 30?.