盆5气田开发后期工艺改进技术研究

Study on Technical Improvement in Late Stage of Peng 5 Gas Field Development

盆5气田天然气处理工艺采用注乙二醇防止水合物,节流制冷控制天然气的露点,该气田开采已进入中后期,产量和压力日益下降,工艺已不能满足外输气压力和露点的要求。为了提高天然气外输压力和降低天然气露点,提出J-T阀前、后增压方案和丙烷制冷改造方案。利用HYSYS软件计算出三个方案中低温分离器天然气相图,对相图进行分析,最后得出丙烷制冷和J-T阀后增压方案并选用燃驱往复式压缩机组,可满足该气田未来10年天然气外输压力和天然气露点要求,具有较好的经济效益,对其它凝析气田后期工艺改造具有一定的借鉴作用。

In gas treatment of Peng 5 Gas Field,applied is ethylene glycol injection method to prevent hydrate formation and applied is the throttling refrigeration method to control gas dew point. The gas field development has been in the mid and late period,its output and pressure are decreasing day by day and its production process already cannot meet gas export pressure and dew point requirements. In order to increase gas export pressure and decrease natural gas dew point,put forward are pressurization scheme upstream and downstream of J-T valve and propane refrigeration scheme. The software HYSYS is used to calculate and draw natural gas chromatograms of low temperature separators in three schemes and analyzed are these chromatograms and results show that propane refrigeration,pressurization scheme downstream of J-T valve and gas-engine-driven reciprocating compressor unit are selected in order to meet gas export pressure and dew point requirements of the gas field in future 10 years,which not only can obtain good economic benefit,but also provide a valuable reference for late process renovation of other condensate fields.