石英砂介质中CO_2水合物形成影响研究  

Influence factors of carbon dioxide hydrate formation in quartz sand media

作　　者：张金华[1] 张郁[2] 魏伟[1] ZHANG Jin-hua;ZHANG Yu;WEI Wei(Department of Alternative Energy, Research Institute of Petroleum Exploration ＆ Development, PetroChina, Langfang 065007, China;Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China)

机构地区：[1]中国石油勘探开发研究院新能源研究所,河北廊坊065007 [2]中国科学院广州能源研究所,广东广州510640

出　　处：《天然气化工—C1化学与化工》2018年第2期34-39,共6页Natural Gas Chemical Industry

基　　金：中国石油油气勘探科技项目(2016B-4901);中国石油-中国科学院科技合作项目(2015A-4813)联合资助

摘　　要：二氧化碳水合物的形成对二氧化碳地下固态封存和二氧化碳置换开采甲烷水合物有着重要的指导意义。在设计的水合物实验装置上,研究了不同初始压力、不同水合物形成温度和不同石英砂粒径条件下对二氧化碳水合物的诱导时间、生成速度等特性的影响。结果表明,水合物的生成量随着初始实验压力的增大和生成温度的降低而增大,基本不受石英砂粒径的影响;水合物平均生成速度随着初始实验压力降低、水合物生成温度降低和石英砂粒径增大而变慢;诱导时间随着初始压力的降低和石英砂粒径的增加而明显变长;若初始实验压力较高,导致二氧化碳在生成水合物前发生液化现象,则水合物生成诱导时间不明显,同时水合物平均生成速度也较慢。The formation of carbon dioxide hydrate has important guiding significance to carbon dioxide underground solid-state storage and replacement exploitation of hydrate with carbon dioxide. The characteristics of carbon dioxide hydrate formation, like induction time and formation rate, were investigated experimentally in a designed hydrate experimental device under different combinations of initial pressure, hydrate forming temperature and quartz sand particle size. It was found that the total yield of hydrate formation increases with the increase of initial experimental pressure and the reduction of temperature, and is almost unaffected by quartz sand particle size. Average rate of hydrate formation slows down with the decreases of initial experimental pressure and hydrate forming temperature and the increase of quartz sand particle size. The induction time of hydrate formation elongates significantly with the decrease of initial pressure and the increase of quartz sand particle size. When the initial experimental pressure is too high, over a certain value, it will result in carbon dioxide liquefaction before hydrate formation, then the induction time of hydrate formation is not obvious and the average rate of hydrate formation is also slow.

关 键 词：石英砂 二氧化碳水合物 粒径 初始实验压力 水合物生成量 诱导时间 

分 类 号：O643.1[理学—物理化学]