Simulation And Optimization Of Natural Gas Emulsion Recycling Process In YM Condensate Gas Field

Many of domain NGL recovery units in gas-condensate field focus on controlling the hydrocarbon dewpoint and apply single refrigeration which leads to a low efficiency. The NGL recovery unit in YM gas-condensate field uses J-T expansion process and its propane recovery rate is only22%. Though others may own a reasonable process, improper operational parameters may also lead to high energy consumption, low production and dented economic benefits. Thus it is necessary to research on the gas-condensate field NGL recovery process and optimize its operational parameter to achieve high efficiency as well as better economic benefits.This paper investigated on typical domain NGL recovery processes in gas-condensate fields and analyzed their defects and further summarized the characteristics of HPA, SCORE and RSV processes. Considering the high pressure drop of NGL recovery process in YM gas-condensate field, compared the corresponding parameters of HPA、SCORE and RSV processes. When the propane recovery rate was unified of90%, the energy consumption of per unit of product of HPA process has been the lowest. Expander-choking two-mode-circulate was adopted in YM NGL recovery Unit.This paper studied on the optimization of the HPA process. First analyzed the univariate sensitivity of HPA process and gave its corresponding recommended range. Established the optimization model aimed at the maximum benefits. Conducted multi-variable optimization of HPA process and defined the main parameter which was further optimized through orthogonal experiments. When the pressure values of deethanizer, debutanizer and the outlet pressure value of expander were separately3900,2600and1700kPa, the economic benefits has been the highest. After optimization, the increased economic benefits could be21.407million yuan.Analyzed the systematic exergy and equipment exergy of HPA process.Calculated the exergy loss, exergy efficiency of the system and equipment and further achieved the distribution of exergy loss among the equipments. According to the results of exergy analysis, the feeding temperature and position was further optimized. After the optimization, an increased economic benefit of2337yuan/d and a decreased exergy of28.1×104kJ/h could be achieved, which lead to an increased benifts of1.516million yuan per day totally.Analyzed the suitability of three processes through changing the composition and pressure of the feeding gas in HYSYS. HPA process made better use of the cooling energy when compared with SCORE and RSV, and could save the compression power in transporting the dry gas, thus achieving the lowest comprehensive energy consumption of per unit of product in studied cases. For a given pressure, the energy consumptions of per unit of product of the three processes in lean gas cases were obviously higher than those in rich gas cases. In lean gas cases, HPA and SCORE fit well when the pressure was higher. In rich gas cases, all three processes fit well in higher pressure.