Study On Test Of Oil Obsorb Engraft In Shallow Refrigeration Plants

Hydrocarbon recovery rate of C₂⁺ in La Sa and Xing oil filed of Daqing is 52.72%, in which nearlyhalf of them is not recovered. The main reason is the shallow refrigeration plants with ammonia or propanerefrigeration process have a low C₃ and C4 recovery rate, in which the average C₃ recovery rate is only 30%or so. This thesis first put forward combined shallow refrigeration-oil absorption process in China, which isbased on the condensation rule study of associated natural gas in Daqing Oilfield. The research shows that:the shallow refrigeration process followed by oil absorption process can greatly increase hydrocarbonrecovery rate. Optimized process flow and operation parameters are obtained after simulation of theinfluence of absorption temperature, absorption pressure and absorbed dose on hydrocarbon recovery rate.This research is given a filed test on Sazong 30×10⁴Nm³/d shallow refrigeration plant. The test result agreeswell with predicted goal. The total C₃ recovery rate in combined shallow refrigeration-oil absorptionprocess can reach 61～85, which is 30～50 higher than traditional shallow refrigeration process. Thiscombined process increases hydrocarbon 8,300 t per year and reducesper-tone-hydrocarbon-energy-consumption 30%. This combined process produce LPG 16,400 per year, inwhich per-tone-LPG-energy-consumption is 30% lower than it a stand-alone LPG plant. The satisfactoryfiled test result of combined shallow refrigeration-oil absorption process provides a new method to recoverheavy hydrocarbons in natural gas in China. This process will have a good application prospect at homeand is especially suitable for reform of hydrocarbon recovery plant whose C3 recovery rate is less than 60%and for process design of new built plant.