化工进展 ›› 2018, Vol. 37 ›› Issue (06): 2182-2191.DOI: 10.16085/j.issn.1000-6613.2017-1405

• 能源加工与技术 • 上一篇    下一篇

含蜡和防聚剂体系天然气水合物浆液生成及流动特性

史博会1, 雍宇1, 柳杨1, 李墨竹1, 丁麟1, 吕晓方2, 吴海浩1, 宫敬1   

  1. 1 中国石油大学(北京)油气管道输送安全国家工程实验室/石油工程教育部重点实验室/城市油气输配技术北京市重点实验室, 北京 102249;
    2 常州大学石油工程学院油气储运重点实验室, 江苏 常州 213016
  • 收稿日期:2017-07-12 修回日期:2018-02-18 出版日期:2018-06-05 发布日期:2018-06-05
  • 通讯作者: 博会(1984-),女,博士,讲师,硕士生导师,主要从事油气多相管流及水合物流动保障技术的研究。
  • 作者简介:博会(1984-),女,博士,讲师,硕士生导师,主要从事油气多相管流及水合物流动保障技术的研究。E-mail:bh.shi@cup.edu.cn。
  • 基金资助:
    国家重点研发计划(2016YFC0303704)、国家自然科学基金(51534007)、国家重大科技专项(2016ZX05028004-001,2016ZX05066005-001)及中国石油大学(北京)科研基金(C201602)项目。

Characteristics of natural gas hydrate slurry formation and flow in systems with wax and anti-agglomerates

SHI Bohui1, YONG Yu1, LIU Yang1, LI Mozhu1, DING Lin1, LÜ Xiaofang2, WU Haihao1, GONG Jing1   

  1. 1 National Engineering Laboratory for Pipeline Safety/MOE Key Laboratory of Petroleum Engineering/Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, China University of Petroleum(Beijing), Beijing 102249, China;
    2 Key Laboratory of Oil and Gas Storage & Transportation Technology, Changzhou University, Changzhou 213016, Jiangsu, China
  • Received:2017-07-12 Revised:2018-02-18 Online:2018-06-05 Published:2018-06-05

摘要: 研究含蜡和防聚剂体系天然气水合物浆液生成及流动特性,对于在深水含蜡油气田实施水合物浆液输送技术、解决海底管道多相混输流动保障问题具有重要意义。本文基于高压水合物环路开展的蜡晶存在与否,对含防聚剂天然气水合物浆液生成及流动影响进行实验,对比分析所获得的实验温度、压力、水合物生成体积分数、流量和压降等宏观参数变化,同时结合颗粒录影显微仪(PVM)、颗粒粒度分析仪(FBRM)等微观数据分析,研究了蜡晶对含防聚剂的天然气水合物浆液生成及流动特性的影响规律。结果表明:相比于无蜡体系,含蜡体系中蜡晶会在防聚剂的作用下吸附在油水界面,减小气水成核反应表面积,增大水合物生成传质阻力,从而抑制水合物生成成核,延长水合物生成诱导期,并使水合物生成量降低;蜡晶与水滴之间团聚物的形成,促进了其与水合物颗粒间的聚并,浆液体系黏度增加,流动性显著下降。含蜡和防聚剂体系天然气水合物浆液生成及流动涉及学科复杂,未来仍需基于已获得的蜡与水合物相关独立研究成果,进一步探讨蜡与水合物之间的耦合作用机理。

关键词: 水合物, 蜡, 成核, 浆液, 多相流

Abstract: The study of characteristics of natural gas hydrate slurry formation and flow with wax crystals and anti-agglomerates, is of great significance for the implementation of hydrate slurry technology in deep water waxy oil and gas fields to solve multiphase flow assurance issues. Based on the experiments of hydrate slurry formation and flow with and without wax crystals in the presence of anti-agglomerates carried out in a high-pressure hydrate flow loop, the variations of temperature, pressure, hydrate formation volume fraction, flow rate and pressure drop were compared and analyzed, and the effect of wax crystals on the characteristics of natural gas hydrate slurry formation and flow in the presence of anti-agglomerates was studied combined with the PVM and FBRM microscopic data analysis. The results indicated that the wax crystals would adsorb on the oil-water interfaces under the action of anti-agglomerates, reduce the reaction area of air-water nucleation and increase the mass transfer resistance of hydrate formation, thus inhibiting the formation and nucleation of hydrates leading to extension of the hydrate formation induction time and reduction of hydrate formation amount comparing with that in the wax free system. The aggregate formation coupling between the wax crystals and water droplets promoted the coalescence with hydrate particles, which increased the viscosity and decreased the fluidity of the hydrate slurry remarkably. The formation and flow of natural gas hydrate slurry with wax in the presence of anti-agglomerates was complex. And, the coupling mechanism between wax crystals and hydrates should be investigated further in the future, based on the existed independent research results of wax crystals and hydrates.

Key words: hydrate, wax, nucleation, slurry, multiphase flow

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