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| 1 | The status of exploitation techniques of natural gas hydrate显示文摘Natural gas hydrate(NGH)has been widely considered as an alternative form of energy with huge potential,due to its tremendous reserves,cleanness and high energy density.Several countries involving Japan,Canada,India and China have launched national projects on the exploration and exploitation of gas hydrate resources.At the beginning of this century,an early trial production of hydrate resources was carried out in Mallik permafrost region,Canada.Japan has conducted the first field test from marine hydrates in 2013,followed by another trial in 2017.China also made its first trial production from marine hydrate sediments in 2017.Yet the low production efficiency,ice/hydrate regeneration,and sand problems are still commonly encountered;the worldwide progress is far before commercialization.Up to now,many gas production techniques have been proposed,and a few of them have been adopted in the field production tests.Nevertheless,hardly any method appears really promising;each of them shows limitations at certain conditions.Therefore,further efforts should be made on the economic efficiency as well as sustainability and environmental impacts.In this paper,the investigations on NGH exploitation techniques are comprehensively reviewed,involving depressurization,thermal stimulation,chemical inhibitor injection,CO2–CH4 exchange,their combinations,and some novel techniques.The behavior of each method and its further potential in the field test are discussed.The advantages and limitations of laboratory studies are also analyzed.The work could give some guidance in the future formulation of exploitation scheme and evaluation of gas production behavior from hydrate reservoirs. | Lei Yang Yulong Liu Hanquan Zhang Bo Xiao Xianwei Guo Rupeng Wei Lei Xu Lingjie Sun Bin Yu Shudong Leng Yanghui Li | 2019 | Chinese Journal of Chemical Engineering2019，27，9： | 9 |
| 2 | 含水合物沉积物孔隙结构特征与微观渗流模拟研究显示文摘含水合物沉积物孔隙结构特征分析和微观渗流模拟是水合物研究的基础性、关键性工作,对深入理解沉积物中水合物的分解机理、储层渗流机理和开采机理有十分重要的意义。总结了国内外含水合物沉积物的微观孔隙探测方法,对比分析了多种微观探测技术应用在水合物研究中的技术特点;重点分析了计算机断层扫描(CT)、扫描电子显微镜(SEM)和核磁共振成像(MRI)技术在含水合物沉积物孔隙结构研究中的应用现状;简述了利用微观数值模拟方法进行含水合物沉积物渗流分析的研究进展;在此基础上,展望了含水合物沉积物孔隙特征分析和微观渗流模拟研究的未来方向和挑战。 | 张永超 刘昌岭 吴能友 刘乐乐 郝锡荦 孟庆国 李承峰 孙建业 王代刚 | 2020 | 海洋地质前沿2020，36，9： | 9 |
| 3 | Experimental Study on Preparation of Natural Gas Hydrate by Crystallization显示文摘In this paper, the saturated solution crystallization method is proposed to promote the formation of hydrate by means of the known similarities between the hydrate formation process and the crystallization process. In this method,adding the second phase crystals was used to replace the spontaneous formation of hydrate crystal nuclei to form hydrate.The effects of saturated Na_2SO_4, MgSO_4, NH_4HCO_3 and CuSO_4 solutions on the formation rates of natural gas hydrate and gas storage capacity were investigated. The results showed that the saturated solution had an influence on the hydrate formation process. Under the given experimental conditions, the saturated Na_2SO_4 solution showed a highest increase in the hydrate formation rate, and the average hydrate formation rate in its presence was 11.8 times higher than that obtained in the deionized water. Moreover, the largest formation rate of gas hydrates observed in the saturated Na_2SO_4 solution was 386 times bigger than that in the deionized water, and the gas storage capacity increased by 10 times. In addition, the average hydrate formation rate in the saturated Mg SO_4 solution was faster than that in water by 20 times. The largest formation rate of gas hydrates in the saturated MgSO_4 solution was 165 times faster than that obtained in the deionized water, and the gas storage capacity increased by 6.2 times. The saturated NH_4HCO_3 and saturated CuSO_4 solutions also influenced the formation process of hydrate. Therefore, the crystallization method of saturated solution can be used to achieve a highefficiency preparation of natural gas hydrates, which provides theoretical guidance for the storage of natural gas in the form of hydrate. | Ma Shihui Pan Zhen Li Ping Wu Yuguo Li Bingfan Kang Jinke Zhang Zhien | 2017 | China Petroleum Processing & Petrochemical Technology2017，19，1： | 7 |
| 4 | 孔隙介质中天然气水合物相变过程的影响因素研究进展显示文摘天然气水合物储量巨大且富含甲烷,被视为21世纪最重要的潜在新型清洁能源之一。天然气水合物大多赋存在海底沉积物的孔隙介质中(少部分赋存于永久冻土层中),对其相变过程受孔隙介质影响规律的系统梳理和总结对未来的勘探开发具有重要意义。本文综合分析前人研究成果,将孔隙介质中天然气水合物的相变过程概化为水合物形成分解时的温压平衡条件变化、速率、稳定性、转化效率以及生长形态、分布状态等;将影响因素分为孔隙介质特性如孔径及粒径、润湿性、导热性能,以及孔隙介质中的物理化学因素如温压和水气条件,并总结了其影响规律和影响机理:(1)孔径及粒径能影响水合物温压平衡条件,较小粒径还能加快水合物相变速率,降低其转化效率。(2)润湿性能够决定水合物的微观生长形态及其与孔隙介质间的接触形式,亲水性强的介质表面能加快水合物的相变速率。(3)孔隙介质导热性能越强,水合物的相变速率越大。(4)温压条件控制下的温压驱动力越大,水合物的相变速率越大,但这种趋势不适用于温压驱动力过大的情形。(5)水气条件影响着水合物相变过程的温压平衡条件、相变速率、稳定性及分布状态。另外,本文分析了目前研究中的不足,并给出了未来的重点研究方向。 | 肖罗坤 董艳辉 李守定 王礼恒 段瑞琪 符韵梅 | 2021 | 工程地质学报2021，29，1： | 2 |
| 5 | Pore capillary pressure and saturation of methane hydrate bearing sediments显示文摘To better understand the relationship between the pore capillary pressure and hydrate saturation in sediments, a new method was proposed. First, the phase equilibria of methane hydrate in fine-grained silica sands were measured. As to the equilibrium data, the pore capillary pressure and saturation of methane hydrate were calculated. The results showed that the phase equilibria of methane hydrates in fine-grained silica sands changed due to the depressed activity of pore water caused by the surface group and negatively charged characteristic of silica particles as well as the capillary pressure in small pores together. The capillary pressure increased with the increase of methane hydrate saturation due to the decrease of the available pore space. However, the capillary-saturation relationship could not yet be described quantitatively because of the stochastic habit of hydrate growth. | SUN Shicai LIU Changling YE Yuguang LIU Yufeng | 2014 | Acta Oceanologica Sinica2014，33，10： | 2 |
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