石油勘探与开发 >

2021 , Vol. 48 >Issue 6: 1269 - 1275

DOI: https://doi.org/10.11698/PED.2021.06.19

石油工程

二氧化碳水合物-石蜡段塞的结构、组分及特性

  • SKIBA Sergey ,
  • SAGIDULLIN Aleksey ,
  • SHAPOVALOVA Alexandra ,
  • STRELETS Larisa ,
  • MANAKOV Andrey
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  • 1.俄罗斯科学院西伯利亚分院尼克拉艾无机化学研究所，新西伯利亚 630090，俄罗斯;
    2.新西伯利亚大学，新西伯利亚 630090，俄罗斯;
    3.俄罗斯科学院西伯利亚分院石油化学研究所，托木斯克 634021，俄罗斯
SKIBA Sergey (1982-),男,俄罗斯人,博士,俄罗斯科学院西伯利亚分院尼克拉艾无机化学研究所研究员,主要从事气体水合物形成与分解过程的研究。地址：Lavrentiev Ave. 3, Novosibirsk, Russia。E-mail: sergey-s-s@mail.ru

收稿日期: 2020-12-01

  修回日期: 2021-10-01

  网络出版日期: 2021-11-25

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Texture, composition and properties of plugs formed by carbon dioxide hydrate and wax

  • SKIBA Sergey ,
  • SAGIDULLIN Aleksey ,
  • SHAPOVALOVA Alexandra ,
  • STRELETS Larisa ,
  • MANAKOV Andrey
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  • 1. Nikolaev Institute of Inorganic Chemistry, SB RAS, Ac. Lavrentiev Ave. 3, Novosibirsk 630090, Russia;
    2. Novosibirsk State University, Pirogova Str. 2, Novosibirsk 630090, Russia;
    3. Institute of Petroleum Chemistry SB RAS, Akademichesky ave., 4, Tomsk 634021, Russia

Received date: 2020-12-01

  Revised date: 2021-10-01

  Online published: 2021-11-25

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摘要

为了研究石蜡和水合物混合生成段塞的结构、组成和分解特征,在准静态条件下,从油包水乳状液中获得了3块二氧化碳水合物与石蜡形成的段塞。粉末X射线衍射和红外光谱分析表明实验室制备的段塞中含有蜡和气体水合物;热容量法和差示扫描量热法实验表明,在环境压力下段塞中气体水合物的主要成分在268 K左右开始分解,该温度比相同压力下二氧化碳水合物的平衡温度高,说明在低于冰熔点温度（273.2 K）下,段塞中的气体水合物可以有效地自我保护;通过显微观察段塞中水合物的分解过程发现,样品中的气体以小气泡的形式析出,而水合物颗粒本身在此放大倍数下不可见,表明水合物在段塞中高度分散,段塞分解后石蜡以胶状出现;流变性测量实验发现,与含蜡原油相比,段塞分解后的残余物具有较高的动切力和黏度。图7表3参39

关键词： 二氧化碳水合物; 水合物-石蜡段塞; 段塞结构; 水合物分解

本文引用格式

SKIBA Sergey , SAGIDULLIN Aleksey , SHAPOVALOVA Alexandra , STRELETS Larisa , MANAKOV Andrey . 二氧化碳水合物-石蜡段塞的结构、组分及特性[J]. 石油勘探与开发, 2021 , 48(6) : 1269 -1275 . DOI: 10.11698/PED.2021.06.19

Abstract

In this work, three wax/gas hydrate plugs were collected at quasi-static conditions from a water-in-oil emulsion to study their texture, composition and decomposition features. Powder X-ray diffraction and IR (infrared spectroscopy) analyses showed that the plugs consisted of wax and gas hydrate. Thermovolumetric and DSC (differential scanning calorimetry) experiments showed that the main part of gas hydrate in the plugs at the ambient pressure started to decompose at about 268 K. This temperature was higher than the equilibrium temperature of carbon dioxide hydrate at this pressure, indicating that the gas hydrate in the plugs could be effectively preserved at temperatures below the ice melting point (273.2 K). It is found through observation of the hydrate decomposition process in the plugs under microscope that gas in the samples released in small bubbles, while the hydrate particles were not visible at this magnification, suggesting that the hydrate was indeed highly dispersed in the samples. A residual wax was jelly-like after decomposition of hydrate in all the cases. Rheologic experiments showed that the residues of the plugs after hydrate decomposition had higher yield points and viscosities than waxy crude oil.

Key words： carbon dioxide hydrate; hydrate/wax plug; plug texture; hydrate decomposition

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