凝析气田开采后期工艺改造方案的选择

Technological Transformation Scheme of Condensate Gas Field during Later Production

针对气田开采中后期压力逐年递减、不能满足"节流制冷脱水脱烃工艺"的节流压差要求而导致外输气水、烃露点不达标的问题,需对原节流制冷工艺进行技术改造。对"节流阀前增压+节流制冷""节流阀前增压+丙烷制冷""节流制冷+节流阀后增压"和"丙烷制冷+节流阀后增压"4种改造工艺的流程进行了详细介绍,从工艺可行性、能耗、投资等方面作了对比分析,得出"节流阀前增压+丙烷制冷工艺"优于其他3种改造工艺。并以某凝析气田为例进行模拟计算,由计算结果可知"节流阀前增压+丙烷制冷工艺"可以满足该气田外输气水、烃露点和外输压力的要求。

During the middle-later production for a gas field, pressure will decrease year by year. And throttling pressure difference can＇t meet the requirement of＂throttling refrigeration, dehydration and dealkylation＂technology, resulting in substandard output gas and water and hydrocarbon dew point. Therefore, the original throttling refrigeration technology should be transformed. The transformation processes of 4 technologies, including＂pressurizing on the upper stream of throttle valve ＋ throttling refrigeration＂,＂pressurizing on the upper stream of throttle valve ＋ propane refrigeration＂,＂throttling refrigeration ＋ pressurizing on the down stream of throttle valve＂, and＂propane refrigeration ＋ pressurizing on the down stream of throttle valve＂, are presented. The analysis on their feasibility, energy consumption and investment shows that the second is the best one. The stimulation for a condensate gas field indicates that this technology can meet the requirements of output gas and water,hydrocarbon dew point and output pressure.