Numerical modeling for drilling fluid invasion into hydrate-bearing sediments and effects of permeability

doi:10.1016/j.jngse.2020.103239

	Numerical modeling for drilling fluid invasion into hydrate-bearing sediments and effects of permeability
	Huang, Tianjia 1,2,3,4; Zhang, Yu 1,2,3; Li, Gang 1,2,3; Li, Xiaosen 1,2,3; Chen, Zhaoyang 1,2,3
刊名	JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
	2020-05-01
卷号	77 页码:17
关键词	Natural gas hydrate Drilling fluid invasion Hydrate dissociation Secondary hydrate Permeability
ISSN号	1875-5100
DOI	10.1016/j.jngse.2020.103239
通讯作者	Zhang, Yu(zhangyu1@ms.giec.ac.cn) ; Li, Xiaosen(lixs@ms.giec.ac.cn)
英文摘要	Drilling fluid invasion into hydrate-bearing sediments could induce hydrate dissociation and complicate heat and mass transfer around wellbore, and further affect mechanical strength of hydrate-bearing sediments and accurateness of wellbore logging interpretations. In this study, a cylindrical numerical model was established to study the characteristics of drilling fluid invasion into hydrate-bearing sediments and the effects of permeability on this process. The distributions of temperature, pressure, saturation, and salinity of pore water around wellbore at different time were obtained. The pressure and temperature around wellbore gradually increase, and the hydrate around wellbore dissociates with the high-temperature drilling fluid invasion. Meantime, water and gas generated from hydrate dissociation gradually migrate outward and then form 'secondary hydrate' in some areas outside wellbore. Dissociation and formation of hydrate can sharply change the salinity of pore water around wellbore. The drilling fluid invasion and hydrate dissociation ranges become larger when the intrinsic permeability is higher. The salinity in sediments decreases sharply while the dilution range is narrow when drilling fluid invasion into hydrate-bearing sediments with low permeability. In addition, the permeability decline exponent of the Masuda model has a significant influence on drilling fluid invasion. However, the Corey exponents of the relative permeability model only have a limited influence on drilling fluid invasion into hydrate-bearing sediments with low intrinsic permeability (e.g., 5.5 mD), while they have a noticeable influence on hydrate-bearing sediments with high intrinsic permeability (e.g., 75 mD).
资助项目	Key Program of National Natural Science Foundation of China[51736009] ; National Natural Science Foundation of China[51676190] ; National Key Research and Development Plan of China[2016YFC0304002] ; National Key Research and Development Plan of China[2017YFC0307306] ; Special project for marine economy development of Guangdong Province[GDME-2018D002] ; Natural Science Foundation of Guangdong Province of China[2017A030313301]
WOS关键词	SEA-WATER SOLUTIONS ; GAS-HYDRATE ; METHANE-HYDRATE ; SHENHU AREA ; RELATIVE PERMEABILITY ; WELLBORE INSTABILITY ; PHYSICAL-PROPERTIES ; STABILITY ; DISSOCIATION ; SATURATION
WOS研究方向	Energy & Fuels ; Engineering
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000527379600018
资助机构	Key Program of National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Plan of China ; Special project for marine economy development of Guangdong Province ; Natural Science Foundation of Guangdong Province of China
内容类型	期刊论文
源URL	[http://ir.giec.ac.cn/handle/344007/26712]
专题	中国科学院广州能源研究所
通讯作者	Zhang, Yu; Li, Xiaosen
作者单位	1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Key Lab Gas Hydrate, Guangzhou 510640, Peoples R China 2.Chinese Acad Sci, Guangdong Prov Key Lab New & Renewable Energy Res, Guangzhou 510640, Peoples R China 3.Chinese Acad Sci, Guangzhou Ctr Gas Hydrate Res, Guangzhou 510640, Peoples R China 4.Univ Chinese Acad Sci, Beijing 10083, Peoples R China
推荐引用方式 GB/T 7714	Huang, Tianjia,Zhang, Yu,Li, Gang,et al. Numerical modeling for drilling fluid invasion into hydrate-bearing sediments and effects of permeability[J]. JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING,2020,77:17.
APA	Huang, Tianjia,Zhang, Yu,Li, Gang,Li, Xiaosen,&Chen, Zhaoyang.(2020).Numerical modeling for drilling fluid invasion into hydrate-bearing sediments and effects of permeability.JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING,77,17.
MLA	Huang, Tianjia,et al."Numerical modeling for drilling fluid invasion into hydrate-bearing sediments and effects of permeability".JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING 77(2020):17.