Numerical study on the movement of the decomposition front of natural gas hydrate under depressurization

PENG Yingyu; SU Zheng; LIU Lihua; JIN Guangrong; WEI Xueqin

doi:10.16562/j.cnki.0256-1492.2020072701

2020 Vol. 40, No. 6

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Article navigation > Marine Geology & Quaternary Geology > 2020 > 40(6): 198-207

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PENG Yingyu, SU Zheng, LIU Lihua, JIN Guangrong, WEI Xueqin. Numerical study on the movement of the decomposition front of natural gas hydrate under depressurization[J]. Marine Geology & Quaternary Geology, 2020, 40(6): 198-207. doi: 10.16562/j.cnki.0256-1492.2020072701

Citation:

PENG Yingyu, SU Zheng, LIU Lihua, JIN Guangrong, WEI Xueqin. Numerical study on the movement of the decomposition front of natural gas hydrate under depressurization[J]. Marine Geology & Quaternary Geology, 2020, 40(6): 198-207. doi: 10.16562/j.cnki.0256-1492.2020072701

Numerical study on the movement of the decomposition front of natural gas hydrate under depressurization

1.
Key Laboratory of Natural Gas Hydrate, Guangzhou Institute of Energy, Chinese Academy of Sciences, Guangzhou 510640, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China

More Information

Corresponding author: SU Zheng, suzheng@ms.giec.ac.cn

Received Date: 27 July 2020

Revised Date: 01 September 2020

Publish Date: 25 December 2020

Abstract

Abstract

In the process of hydrate decompression, there occurs a decomposition front between the decomposed and undecomposed regions of gas hydrate reservoir. Studying the movement of the decomposition front may help to understand the hydrate decomposition characteristics and further predict the gas volume, which will provide a scientific reference for the actual exploitation potential. In this paper, a one-dimensional and three-phase mathematical model is established. After analyzing the parameter magnitude, the movement of gas and water in hydrate reservoir is regarded as steady flow, and the decomposition front is calculated. Meanwhile, the temperature field equations were dimensionless trans-formed to obtain the transcendental equations for calculating temperature. Combined with the model example, it is considered that the movement of the hydrate decomposition front is linear with the square root of time, and the gas production rate rapidly decreases to a stable value after reaching the peak in the early period. In addition, based on the results of the first trial production in Shen Hu area of the South China Sea, it is found that the total gas production calculated by the model is higher than the actual trial production value, and the relative error is within the acceptable range. Therefore, this paper provides a new simple calculation method for hydrate exploitation characteristics, and gives an optimistic prediction for the exploitation potential. Finally, through sensitivity analyses of the initial temperature, absolute permeability and porosity, it is found that with the increase of the initial temperature and permeability of the formation, the moving distance of the hydrate decomposition front will increase, and the initial formation temperature has a significant effect on the decomposition of hydrate. As the porosity of the formation gets greater, the movement rate of the decomposition front decreases, the moving distance decreases, and the pressure difference between the wellhead and the decomposition front decreases. At this time, the movement of the decomposition front is determined by the thermal physical parameters of the reservoir.
- gas hydrate /
- decomposition front /
- depressurization /
- theoretical model

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References

[1]	Konno Y, Fujii T, Sato A, et al. Key findings of the world's first offshore methane hydrate production test off the coast of japan: toward future commercial production [J]. Energy & Fuels, 2017, 31(3): 2607-2616. Google Scholar
[2]	Aghajari H, Moghaddam M H, Zallaghi M. Study of effective parameters for enhancement of methane gas production from natural gas hydrate reservoirs [J]. Green Energy & Environment, 2019, 4(4): 453-469. Google Scholar
[3]	Moridis G J, Reagan M T, Queiruga A F, et al. Evaluation of the performance of the oceanic hydrate accumulation at site NGHP-02-09 in the Krishna-Godavari Basin during a production test and during single and multi-well production scenarios [J]. Marine and Petroleum Geology, 2019, 108: 660-696. doi: 10.1016/j.marpetgeo.2018.12.001 CrossRef Google Scholar
[4]	Huang L, Su Z, Wu N Y, et al. Analysis on geologic conditions affecting the performance of gas production from hydrate deposits [J]. Marine and Petroleum Geology, 2016, 77: 19-29. doi: 10.1016/j.marpetgeo.2016.05.034 CrossRef Google Scholar
[5]	Li S, Zheng R, Xu X, et al. Dissociation of methane hydrate by hot brine [J]. Petroleum Science and Technology, 2015, 33(6): 671-677. doi: 10.1080/10916466.2015.1005845 CrossRef Google Scholar
[6]	Li F G, Yuan Q, Li T D, et al. A review: enhanced recovery of natural gas hydrate reservoirs [J]. Chinese Journal of Chemical Engineering, 2019, 27(9): 2062-2073. doi: 10.1016/j.cjche.2018.11.007 CrossRef Google Scholar
[7]	Kurihara M, Sato A, Ouchi H, et al. Prediction of gas productivity from eastern nankai trough methane-hydrate reservoirs [J]. SPE Reservoir Evaluation & Engineering, 2009, 12(3): 477-499. Google Scholar
[8]	李淑霞, 武迪迪, 王志强, 等. 神狐水合物藏降压开采分解前缘数值模拟研究[J]. 中国科学: 物理学力学天文学, 2019, 49(3):112-122 Google Scholar LI Shuxia, WU Didi, WANG Zhiqiang, et al. Numerical simulation of dissociation front of shenhu hydrate reservoirs by depressurization [J]. SCIENTIA SINICA Physica, Mechanica & Astronomica, 2019, 49(3): 112-122. Google Scholar
[9]	Fujii T, Suzuki K, Takayama T, et al. Geological setting and characterization of a methane hydrate reservoir distributed at the first offshore production test site on the Daini-Atsumi Knoll in the eastern Nankai Trough, Japan [J]. Marine and Petroleum Geology, 2015, 66: 310-322. doi: 10.1016/j.marpetgeo.2015.02.037 CrossRef Google Scholar
[10]	Makogon Y F. Hydrates of Hydrocarbons[M]. Oklahoma: Pennwell Books, 1997. Google Scholar
[11]	Verigin N N, Khabibullin I L, Khalikov G A. Linear problem of the dissociation of the hydrates of a gas in a porous medium [J]. Fluid Dynamics, 1980, 15(1): 144-147. doi: 10.1007/BF01089829 CrossRef Google Scholar
[12]	Ji C, Ahmadi G, Smith D H. Natural gas production from hydrate decomposition by depressurization [J]. Chemical Engineering Science, 2001, 56(20): 5801-5814. doi: 10.1016/S0009-2509(01)00265-2 CrossRef Google Scholar
[13]	喻西崇, 吴应湘, 安维杰, 等. 开采地层中的天然气水合物的数学模型[J]. 天然气工业, 2004, 24(1):63-67 Google Scholar YU Xichong, WU Yingxiang, AN Weijie, et al. Mathematical model to recover gas hydrate from formations [J]. Natural Gas Industry, 2004, 24(1): 63-67. Google Scholar
[14]	唐良广, 李刚, 冯自平, 等. 热力法开采天然气水合物的数学模拟[J]. 天然气工业, 2006, 26(10):105-107 Google Scholar TANG Guangliang, LI Gang, FENG Ziping, et al. Mathematic modeling on thermal recovery of natural gas hydrate [J]. Natural Gas Industry, 2006, 26(10): 105-107. Google Scholar
[15]	张旭辉, 刘艳华, 李清平, 等. 沉积物中导热体周围水合物分解范围研究[J]. 力学与实践, 2010, 32(2):39-41, 25 Google Scholar ZHANG Xuhui, LIU Yanhua, LI Qingping, et al. The dissociation scope of gas hydrate in deposit around heat conductor [J]. Mechanics in Engineering, 2010, 32(2): 39-41, 25. Google Scholar
[16]	刘乐乐, 鲁晓兵, 张旭辉. 天然气水合物分解区演化数值分析[J]. 石油学报, 2014, 35(5):941-951 Google Scholar LIU Lele, LU Xiaobin, ZHANG Xuhui, et al. Numerical analysis on evolution of natural gas hydrate decomposition region in hydrate-bearing sedim [J]. Acta Petrolei Sinica, 2014, 35(5): 941-951. Google Scholar
[17]	Li M C, Fan S S, Su Y L, et al. Mathematical models of the heat-water dissociation of natural gas hydrates considering a moving Stefan boundary [J]. Energy, 2015, 90: 202-207. doi: 10.1016/j.energy.2015.05.064 CrossRef Google Scholar
[18]	Long X Y, Tjok K, Adhikari S. Numerical investigation on gas hydrate production by depressurization in hydrate-bearing reservoir[C]//Proceedings of the ASME 35th International Conference on Ocean, Offshore and Arctic Engineering. Busan: ASME, 2016. Google Scholar
[19]	Zheng R Y, Li S X, Li X L. Sensitivity analysis of hydrate dissociation front conditioned to depressurization and wellbore heating [J]. Marine and Petroleum Geology, 2018, 91: 631-638. doi: 10.1016/j.marpetgeo.2018.01.010 CrossRef Google Scholar
[20]	Ji C, Ahmadi G, Smith D H. Constant rate natural gas production from a well in a hydrate reservoir [J]. Energy Conversion and Management, 2003, 44(15): 2403-2423. doi: 10.1016/S0196-8904(03)00010-4 CrossRef Google Scholar
[21]	Tsypkin G G. Mathematical model for dissociation of gas hydrates coexisting with gas in strata [J]. Doklady Physics, 2001, 46(11): 806-809. doi: 10.1134/1.1424377 CrossRef Google Scholar
[22]	Wang G X, Prasad V, Matthys E F. An interface-tracking numerical method for rapid planar solidification of binary alloys with application to microsegregation [J]. Materials Science and Engineering: A, 1997, 225(1-2): 47-58. doi: 10.1016/S0921-5093(96)10577-3 CrossRef Google Scholar
[23]	Tsypkin G G. Formation of the impermeable layer in the process of methane hydrate dissociation in porous media [J]. Fluid Dynamics, 2017, 52(5): 657-665. doi: 10.1134/S0015462817050076 CrossRef Google Scholar
[24]	Tsypkin G G. Analytical solution of the nonlinear problem of gas hydrate dissociation in a formation [J]. Fluid Dynamics, 2007, 42(5): 798-806. doi: 10.1134/S0015462807050122 CrossRef Google Scholar
[25]	Ahmadi G, Ji C, Smith D H. Natural gas production from hydrate dissociation: an axisymmetric model [J]. Journal of Petroleum Science and Engineering, 2007, 58(1-2): 245-258. doi: 10.1016/j.petrol.2007.01.001 CrossRef Google Scholar
[26]	Makogon T Y, Larsen R, Knight C A, et al. Melt growth of tetrahydrofuran clathrate hydrate and its inhibition: method and first results [J]. Journal of Crystal Growth, 1997, 179(1-2): 258-262. doi: 10.1016/S0022-0248(97)00118-8 CrossRef Google Scholar
[27]	Ostrach S. Role of analysis in the solution of complex physical problems[C]//International Heat Transfer Conference 3. 2019. Google Scholar
[28]	Yousif M H, Li P M, Selim M S, et al. Depressurization of natural gas hydrates in berea sandstone cores [J]. Journal of Inclusion Phenomena and Molecular Recognition in Chemistry, 1990, 8(1-2): 71-88. doi: 10.1007/BF01131289 CrossRef Google Scholar
[29]	Su Z, Cao Y C, Wu N Y, et al. Numerical analysis on gas production efficiency from hydrate deposits by thermal stimulation: application to the Shenhu Area, South China Sea [J]. Energies, 2011, 4(2): 294-313. doi: 10.3390/en4020294 CrossRef Google Scholar
[30]	Feng J C, Wang Y, Li X S, et al. Production performance of gas hydrate accumulation at the GMGS2-Site 16 of the Pearl River Mouth Basin in the South China Sea [J]. Journal of Natural Gas Science and Engineering, 2015, 27: 306-320. doi: 10.1016/j.jngse.2015.08.071 CrossRef Google Scholar
[31]	Sun Y H, Ma X L, Guo W, et al. Numerical simulation of the short- and long-term production behavior of the first offshore gas hydrate production test in the South China Sea [J]. Journal of Petroleum Science and Engineering, 2019, 181: 106196. doi: 10.1016/j.petrol.2019.106196 CrossRef Google Scholar
[32]	Chen L, Feng Y C, Okajima J, et al. Production behavior and numerical analysis for 2017 methane hydrate extraction test of Shenhu, South China Sea [J]. Journal of Natural Gas Science and Engineering, 2018, 53: 55-66. doi: 10.1016/j.jngse.2018.02.029 CrossRef Google Scholar
[33]	Giraldo C, Klump J, Clarke M, et al. Sensitivity analysis of parameters governing the recovery of methane from natural gas hydrate reservoirs [J]. Energies, 2014, 7(4): 2148-2176. doi: 10.3390/en7042148 CrossRef Google Scholar
[34]	Wang D Y, Ma X J, Qiao J. Impact factors of natural gas hydrate dissociation by depressurization: a review [J]. Advanced Materials Research, 2014, 868: 564-567. Google Scholar
[35]	Konno Y, Oyama H, Nagao J, et al. Numerical analysis of the dissociation experiment of naturally occurring gas hydrate in sediment cores obtained at the eastern Nankai trough, Japan [J]. Energy & Fuels, 2010, 24(12): 6353-6358. Google Scholar
[36]	Sun X, Luo T T, Wang L, et al. Numerical simulation of gas recovery from a low-permeability hydrate reservoir by depressurization [J]. Applied Energy, 2019, 250: 7-18. doi: 10.1016/j.apenergy.2019.05.035 CrossRef Google Scholar
[37]	Kaviany M. Principles of heat transfer in porous media [J]. Mechanical Engineering, 1991, 49(5): B103-B104. Google Scholar