油田伴生气脱氮工艺参数及能效分析  

Denitrification process parameters and energy efficiency analysis of oilfield associated gas

作　　者：曹蕴 CAO Yun(No.5 Oil Production Plant of Daqing Oilfield Co.,Ltd.)

机构地区：[1]大庆油田有限责任公司第五采油厂,163000

出　　处：《石油石化节能与计量》2024年第9期59-64,共6页Energy Conservation and Measurement in Petroleum & Petrochemical Industry

摘　　要：油井伴生气中的氮气含量过高会影响油气的外输质量,为此基于软件模拟,从优化工艺参数出发,采用溶剂吸收法结合闪蒸分离对伴生气进行脱氮处理,研究不同工况下、不同溶剂的甲烷和氮气溶解效果,分析工艺参数对脱氮深度和工艺能效的影响。结果表明:高压、低温环境有利于伴生气脱氮工艺的进行;将C5作为溶剂时,对甲烷的溶解性最好;伴生气入塔温度越低、溶剂入塔温度越低、吸收塔压力越低,比功耗越小;在溶剂循环量为3 400 kmol/h时,比功耗达到最小值。最后结合实验设计完成多目标参数的优化,即当伴生气入塔温度为-30℃、溶剂入塔温度为-40℃、溶剂循环量为3 356 kmol/h、吸收塔压力为2.2 MPa时,总能耗可从2 855 kW降至2 651 kW。The excessive nitrogen of associated gas in oil wells can affect the quality of external transportation.Based on the software simulation,starting from the optimization of process parameters,the solvent absorption method combined with flash separation is used to denitrification treatment on the associated gas.The dissolution effect of methane and nitrogen in different solvents under different working conditions is studied,and the influence of process parameters on the depth of denitrification and process energy efficiency is analyzed.The results show that high pressure and low temperature environment are favorable to denitrification process of associated gas.When C5 is used as solvent,the solubility of methane is best.The lower the temperature of the associated gas is,the lower the temperature of the solvent is.The lower the pressure of the absorber is,the lower the specific power consumption is.When the solvent circulation is 3400 kmol/h,the specific power consumption reaches the minimum value.Finally the optimization of multiple target parameters is completed,combined with the experimental design.That's to say,when the temperature of associated gas entering the tower is-30℃,the temperature of solvent entering the tower is-40℃,the solvent circulation amount is 3356 kmol/h,and the pressure of the absorber is 2.2 MPa,the total energy consumption can be reduced from 2855 kW to 2651 kW.

关 键 词：油田伴生气 脱氮工艺 响应曲面实验 溶剂吸收法 闪蒸分离 比功耗 

分 类 号：TE832[石油与天然气工程—油气储运工程]