摘要
长庆某油田使用烃类气驱的开采方法,导致井流物具有较高的气油比(30~100 m^(3)/t),本研究针对其输送过程中易出现的水合物防控问题开展了相关实验研究。相对于添加传统热力学抑制剂(THI)的防控方案,动力学抑制剂(KHI)以其用量少、效益高、环保等优点受到越来越多的关注。然而,根据大量油田现场实例及实验研究结果可以发现,单一抑制剂的效果并不理想,传统KHI的抑制效果受到温度的影响很大。在高过冷度的条件下,其抑制作用可能失效。因此,通过在动力学抑制剂体系中加入增效剂,使增效剂与抑制剂产生协同作用,进而增强抑制剂的抑制效果的协同抑制方案成为研究热点。本研究在500 mL的高压反应釜中开展实验。实验研究了PVP、PVCap两种动力学抑制剂及其与乙二醇(MEG)复配而成的协同抑制剂对水合物生成的抑制性能。在水合物生成过程中,针对复配抑制剂对水合物生成的抑制作用,从抑制剂浓度、最大可承受过冷度以及与MEG复配效果这3个角度出发,开展了42组实验,测试两种动力学抑制剂的抑制性能。实验结果表明,同等质量浓度条件下,动力学抑制剂PVCap的抑制能力优于动力学抑制剂PVP。PVCap在近20℃过冷度的条件下依然展现出良好的抑制能力。在PVCap、PVP两者与MEG复配的协同实验中,可以发现他们都表现出了一定程度的协同抑制效果。其中PVCap与MEG的协同效果更为明显。3 wt%PVCap与5 wt%MEG的协同抑制剂组合在高过冷度(22℃)下,可将天然气水合物诱导期延长至9 h以上,这一发现表明合理有效的协同抑制方案可以有效提高KHI的抑制性能,有助于推广KHI在国内高过冷环境下油气资源领域的应用,为高效解决高过冷条件下油气生产中水合物防控问题提供技术支持。
A hydrocarbon gas drive production method is used in an oil field in Changqing.The use of this method may lead to a high gas-oil ratio(30~100 m^(3)/t)of well flow.This study carried out relevant experimental research into hydrate prevention and control problems that are common in the process of the hydrocarbon gas drive method.Compared with the prevention and control scheme of adding a traditional thermodynamic inhibitor(THI),a kinetic inhibitor(KHI)has attracted more and more at-tention for its advantages of low dosage,high efficiency and environmental protection.However,according to a large number of field examples and experimental research results,it can be found that the effect of a single inhibitor is not ideal,and the inhibition effect of traditional KHI is greatly affected by temperature.Under high undercooling,its suppression may fail.Adding synergists to the kinetic inhibitor system enhances the inhibition effect.This has become an important research topic Two kinetic inhibitors of PVP(polyvinylpyrrolidone)and PVCap(polyvinylcaprolactam)and their synergistic inhibitors combined with mono-ethylene glycol(MEG)were experimentally studied in a 500 mL autoclave.In the process of hydrate formation,the inhibition effect of compound inhibitors on hydrate formation was studied.The inhibition performance of the two kinetic inhibitors was tested from the perspectives of inhibitor concentration,maximum allowable undercooling and the effect of combination with MEG.A total of 42 groups of experiments were carried out in this study.The experimental results show that the inhibition ability of kinetic inhib-itor PVCap is better than that of kinetic inhibitor PVP at the same mass concentration.PVCap still showed good inhibition ability at nearly 20℃undercooling.In the synergistic experiment of PVCap and PVP combined with MEG,it can be found that they all showed a certain degree of synergistic inhibition.The synergistic effect of PVCap and MEG is more obvious.The synergistic inhibitor combination of 3 wt%PVCap and 5 wt%MEG can prolong the induction period of natural gas hydrate to more than 9 h under high undercooling(22℃),which shows that a reasonable and effective synergistic inhibition scheme can effectively improve the inhibition performance of KHI,help to promote the application of KHI in the field of oil and gas resources under a domestic high undercooling environment,and provide technical support for efficiently solving the problem of hydrate prevention and control in oil and gas production under high undercooling conditions.
作者
隋金昊
王智
梁璇玑
朱羽墨
宋尚飞
史博会
宫敬
SUI Jinhao;WANG Zhi;LIANG Xuanji;ZHU Yumo;SONG Shangfei;SHI Bohui;GONG Jing(College of Carbon Neutrality Demonstration Energy,China University of Petroleum-Beijing,Beijing 102249,China;National Engineering Laboratory for Pipeline Safety/MOE Key Laboratory of Petroleum Engineering/Beijing Key Laboratory of Urban Oil and Gas Distribution Technology/State Key Laboratory of Natural Gas Hydrates,China University of Petroleum-Beijing,Beijing 102249,China;Changqing Engineering Design Co.,Ltd.,Xi'an 710018,China)
出处
《石油科学通报》
CAS
2023年第6期811-821,共11页
Petroleum Science Bulletin
基金
国家重点研发计划(2022YFC2806200)
北京市自然科学基金(3232030)
国家自然科学基金(52104069,U20B6005)
中国博士后科学基金资助项目(2022M713460)
中国石油大学(北京)科研基金资助(2462023BJRC018,2462020YXZZ045)联合资助。
关键词
水合物
动力学
协同
成核
抑制剂
hydrate
synergistic
nucleation
inhibitor
kinetic