Study on the decomposition conditions of gas hydrate in quartz sand-brine mixture systems

被引:20
作者
Wang, Xiao-Hui [1 ]
Wang, Yun-Fei [1 ]
Xie, Yan [1 ]
Sun, Chang-Yu [1 ]
Chen, Guang-Jin [1 ]
机构
[1] China Univ Petr, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China
基金
中国博士后科学基金; 中国国家自然科学基金;
关键词
Gas hydrate; Decomposition condition; Quartz sand; Brine; Stepwise depressurising; METHANE HYDRATE; PORE-SIZE; PHASE-EQUILIBRIA; CARBON-DIOXIDE; SILICA-GELS; BEHAVIOR; TEMPERATURES; DESALINATION; PRESSURES; MEDIA;
D O I
10.1016/j.jct.2018.11.009
中图分类号
O414.1 [热力学];
学科分类号
摘要
There are huge reserves of natural gas hydrates, a type of low-carbon energy resource, and it is considered important to study the stability conditions of hydrates in situ, to facilitate reserve evaluation and exploitation. The decomposition conditions of methane hydrate were determined in a quartz sand-brine mixing system, using an isothermal, stepwise, depressurising method. Influencing factors, such as sand particle size and pore water salt concentration, and the combined effect of these factors on the hydrate phase equilibrium, were investigated. The results showed that the decomposition pressure was distributed over a small range, and at specific temperatures. This may be partly related to the uneven distribution of pore size, but was shown to be mainly owing to the change of salt concentration during hydrate dissociation, as verified by differential scanning calorimetry. In addition, the hydrate dissociation pressure increased slightly with decreased particle size, and the maximum relative deviation of the dissociation pressure was 1.68%, when the sand particle size was within 100 mesh, which was mathematically negligible. For predicting the decomposition condition of hydrate in the quartz sand-brine mixing system, commercially-available CSMgem and PVTsim software showed high accuracy across a large temperature interval. An in-house, Chen-Guo hydrate model was valid when the temperature was below 277 K, while the Multiflash programme exhibited too large an error to be applied to this system. (C) 2018 Elsevier Ltd.
引用
收藏
页码:247 / 253
页数:7
相关论文
共 36 条
[1]   Characteristics of clathrate hydrate equilibria in mesopores and interpretation of experimental data [J].
Anderson, R ;
Llamedo, M ;
Tohidi, B ;
Burgass, RW .
JOURNAL OF PHYSICAL CHEMISTRY B, 2003, 107 (15) :3500-3506
[2]  
Boswell R., 2010, ENERG ENVIRON SCI, V4, P1206, DOI [DOI 10.1039/C0EE00203H, 10.1039/c0ee00203h]
[3]   Methane hydrate phase equilibria for systems containing NaCl, KCl, and NH4Cl [J].
Cha, Minjun ;
Hu, Yue ;
Sum, Amadeu K. .
FLUID PHASE EQUILIBRIA, 2016, 413 :2-9
[4]   A new approach to gas hydrate modelling [J].
Chen, GJ ;
Guo, TM .
CHEMICAL ENGINEERING JOURNAL, 1998, 71 (02) :145-151
[5]   Thermodynamic modeling of hydrate formation based on new concepts [J].
Chen, GJ ;
Guo, TM .
FLUID PHASE EQUILIBRIA, 1996, 122 (1-2) :43-65
[6]   Thermodynamics Model of Predicting Gas Hydrate in Porous Media Based on Reaction-Adsorption Two-Step Formation Mechanism [J].
Chen, Li-Tao ;
Sun, Chang-Yu ;
Chen, Guang-Jin ;
Nie, Yun-Qiang .
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 2010, 49 (08) :3936-3943
[7]   Measurements of Hydrate Equilibrium Conditions for CH4, CO2, and CH4 + C2H6 + C3H8 in Various Systems by Step-heating Method [J].
Chen Litao ;
Sun Changyu ;
Chen Guangjin ;
Nie Yunqiang ;
Sun Zhansong ;
Liu Yantao .
CHINESE JOURNAL OF CHEMICAL ENGINEERING, 2009, 17 (04) :635-641
[8]   Size Effect of Porous Media on Methane Hydrate Formation and Dissociation in an Excess Gas Environment [J].
Chong, Zheng Rong ;
Yang, Mingjun ;
Khoo, Boo Cheong ;
Linga, Praveen .
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 2016, 55 (29) :7981-7991
[9]   Review of natural gas hydrates as an energy resource: Prospects and challenges [J].
Chong, Zheng Rong ;
Yang, She Hern Bryan ;
Babu, Ponnivalavan ;
Linga, Praveen ;
Li, Xiao-Sen .
APPLIED ENERGY, 2016, 162 :1633-1652
[10]   EQUILIBRIUM CONDITIONS FOR METHANE HYDRATE FORMATION IN AQUEOUS MIXED ELECTROLYTE-SOLUTIONS [J].
DHOLABHAI, PD ;
ENGLEZOS, P ;
KALOGERAKIS, N ;
BISHNOI, PR .
CANADIAN JOURNAL OF CHEMICAL ENGINEERING, 1991, 69 (03) :800-805