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水合物管道堵塞是油气工业安全生产的重要问题之一,目前低剂量抑制剂以其经济性、环境友好性等优点,逐步取代传统抑制剂.文中在8.5MPa、4℃条件下,1.072L反应釜内,采用甲烷、乙烷和丙烷混和气,研究了含低剂量抑制剂聚乙烯吡咯烷酮(PVP)和GHI1的水合物生成体系反应过程,计算分析了压缩因子和自由气量随反应时间的变化,对比了在相同反应程度下添加PVP和GHI1后水合物含气量的区别,探讨了GHI1组合抑制剂的抑制机理实验结果表明PVP和GHI1能抑制水合物生长,不能有效抑制水合物成核;添加PVP的体系在实验气体组成下,甲烷乙烷进入水合物小晶穴,并且甲烷优先进入小晶穴;GHI1对丙烷乙烷的抑制能力强于甲烷;对比GHI1和PVP的反应过程,认为协同剂二乙二醇丁醚的羟基和醚类结构加强反应体系中的氢键,和PVP结合使用,通过氢键和空阻达到抑制效果.
Blockage of hydrate pipeline is one of the most important problems in oil and gas industry safety production. At present, low-dose inhibitors gradually replace traditional inhibitors due to their economy and environmental friendliness. Under the conditions of 8.5MPa and 4 ℃, 1.072L reaction In the autoclave, the reaction process of the hydrate formation system with low dose of PVP and GHI1 was studied using the mixed gas of methane, ethane and propane. The changes of compression factor and free gas volume with the reaction time were calculated and analyzed. Comparing the difference of gas content of hydrate after adding PVP and GHI1 under the same degree of reaction, the inhibition mechanism of GHI1 combination inhibitor was discussed. The experimental results show that PVP and GHI1 can inhibit hydrate growth and can not inhibit hydrate nucleation effectively. Adding PVP Under the experimental gas composition, methane and ethane enter into the small hydrate crystal, and methane preferentially enters into small crystal cavity. The inhibition of GHI1 to propane ethane is stronger than that of methane. Comparing the reaction process between GHI1 and PVP, Ethylene glycol butyl ether hydroxyl and ether structure to strengthen the hydrogen bond in the reaction system, combined with the use of PVP, through hydrogen bonding and empty resistance to inhibit effect.