天然气水合物冷源外置式孔底冷冻绳索取样器冷冻效率优化研究
投稿时间:2018-10-29  修订日期:2019-04-26  点此下载全文
引用本文:曲莉莉,王 元,贾 瑞,陈光华,张鹏宇.天然气水合物冷源外置式孔底冷冻绳索取样器冷冻效率优化研究[J].探矿工程(岩土钻掘工程),2019,46(7):14-20.
QU Lili,WANG Yuan,JIA Rui,CHEN Guanghua,ZHANG Pengyu. Optimization of freezing efficiency of hole-bottom freezing wire-line sampler with off-board cooling-source[J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2019,46(7):14-20.
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作者单位E-mail
曲莉莉 吉林大学建设工程学院 qulili@jlu.edu.cn 
王 元 吉林大学建设工程学院 460731412@qq.com 
贾 瑞 吉林大学建设工程学院  
陈光华 中建三局第一建设工程有限公司  
张鹏宇 吉林大学建设工程学院  
基金项目:自然资源部复杂条件钻采技术重点实验室(吉林大学)开放课题(编号:201712)
中文摘要:为解决天然气水合物冷冻取样钻具冷源难以在孔底长时间存储及冷冻岩心效率低的问题,本文提出了采用冷源外置式冷冻岩心样品的方法,即将冷源存放在打捞器中减少冷源在孔内的存储时间,提高冷源的存储效率,并在冷冻过程中向冷冻腔内通入氮气增强低温酒精与岩心的对流换热以提高岩心的冷冻效率。采用液氮与酒精混合形成的低温酒精(-130 ℃)作为冷源进行冷源存储及岩心冷冻试验,模拟孔内环境存储30 min后,冷冻能量保存率为731%。通过注入氮气提高冷源与岩心的换热效率,可将岩心平均温度降至-1492 ℃,与传统方式相比冷冻效率提高243%。试验结果表明,通过冷源外置式的结构和通过注气增强对流换热的方法能够解决冷源不能长时间存储及岩心冷冻效率低的问题,为天然气水合物钻探获取原始样品提供了一种可行的方法。
中文关键词:天然气水合物  孔底冷冻  绳索取心  冷冻效率优化
 
Optimization of freezing efficiency of hole-bottom freezing wire-line sampler with off-board cooling-source
Abstract:In order to solve the problem that the cooling source of conventional gas hydrate hole-bottom freezing sampler is difficult to be stored for a long time and the core freezing efficiency is low, an external cooling source freezing sampling method is proposed. The cooling source is stored in the fishing device, which reduces the storage time in the hole and improves the storage efficiency. During the freezing process, nitrogen is injected into the freezing chamber to enhance the convection of heat transfer between cooling alcohol and core and to improve the core freezing efficiency. Low temperature alcohol(-130℃), a mixture of liquid nitrogen and alcohol,is used as a cooling source. Cooling source storage test and core frozen experiment are carried out in this paper. During the procedure storing 30-minute cooling source, the frozen energy storage rate is 73.1%. The thermal efficiency between cold source and core is improved because the nitrogen is injected in the cooling source, the average temperature of the core drops to 14.9i2℃, the freezing efficiency is increased by 24.3% compared with the traditional way.The problem that the cooling source cannot be stored in the drill pipe for a long time can be solved by adopting the cooling source external sampler structure. The problem of low core freezing efficiency can be solved by passing nitrogen into the cooling source to increase the convection of heat transfer. This paper provides a feasible method for Natural gas hydrate sampling.
keywords:Gas hydrate  Hole-bottom freezing  Wire-line sampling  Freezing efficiency optimization
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