Investigation And Simulation Of Light Hydrocarbon Recovery Process In Tahe Oilfield

Tahe oilfield is under constant development and construction, and gradually established three sets of triple tower light hydrocarbon recovery in the first union station, the second union station and the third union station of Tahe Oilfield. However, with the continuous development of heavy oil block in Tahe oilfield, especially the development of twelve area high sulfur heavy oil blocks, the property of associated gas in oil field and the pressure, temperature of the in and out of the station have taken place in the corresponding change, make the light hydrocarbon recovery process operating conditions changed, and affect the product quality and efficiency, although after reform, there are still certain problems.In this paper, we study in the running status of the light hydrocarbon station in Tahe oilfield and analysis the existing problems in the operation of light hydrocarbon station, then it proposes the corresponding solution measures. we can use HYSYS software simulation results comparing with actual operation parameters,and verifying the HYSYS software can accurately imulate the light hydrocarbon station operation parameters.Therefore, we use the software to simulate the adaptability of light hydrocarbon process and running effect of adjustment scheme. In addition, we study the optimization of ight hydrocarbon process parameter, and put forward process parameters optimization scheme.Analysis shows that in Tahe oil field the main problems existing in the first union station are the feed gas containing sulfur and no desulfurization equipment; The second union station main problem is the sulfur content of purify gas which is not up to standard which affects the quality of the products, so we should adjust the MDEA regenerator operation parameters. The third union station mainly exists the problem that the temperature of gas after cooling tower and the temperature of MDEA barren liquor into the absorption tower are high. When we analysis the adaptability of the second light hydrocarbon station, we know that in the same temperature and pressure the feed gas is more poor, the lower the recovery rate of C3. When C3mole fraction is6.20%, recovery rate of C3is less than60%. We Should reduce the cooling temperature, and make C3recovery rate higher than60%; When the inlet temperature is increased to50℃, C3+recovery is less than60%, so we suggest that we should consider the feed gas cooling problem, when the feed gas temperature increased to more than45℃. By adjusting the top and bottom pressure of MDEA regeneration tower and the bottom temperature, the sulfur content of the second union station can be controlled at2.8mg/m3, which can effectively solve the exceeding standard problems of purification gas. Process parameters optimization results show that the adjustment of the key operation parameters can effectively increase the efficiency of propane recovery rate and realize the purpose of reducing the energy consumption. For the third union station, when the expander compressor outlet temperature is24℃, the propane recovery rate is88.7%, and the C3+recovery rate is93.4%.