Numerical analysis of horizontal wellbore state during drilling at the first offshore hydrate production test site in Shenhu area of the South China Sea

doi:10.1016/j.oceaneng.2021.109614

	Numerical analysis of horizontal wellbore state during drilling at the first offshore hydrate production test site in Shenhu area of the South China Sea
	Sun, Jiaxin 1,2; Ning, Fulong 1,3; Liu, Tianle 1; Li, Yanlong 1,3; Lei, Hongwu 4; Zhang, Ling 1; Cheng, Wan 1; Wang, Ren 5; Cao, Xinxin 1; Jiang, Guosheng 1
刊名	OCEAN ENGINEERING
	2021-10-15
卷号	238 页码:24
关键词	Gas hydrate Horizontal well Wellbore stability Secondary hydrate formation Mud cake
ISSN号	0029-8018
DOI	10.1016/j.oceaneng.2021.109614
英文摘要	Horizontal well drilling in the unconsolidated marine hydrate sediments is a challenging issue due to high risk of wellbore instability. This paper analyzed this issue under different conditions through numerical simulations based on the field available data in Shenhu area of the South China Sea. Besides, the potential secondary hydrate formation in the annulus and the influence of mud cake on the wellbore stability were discussed. The results show that the assumed horizontal wellbore may not collapse at the site SHSC-4 even though some local areas may enter the yielded state, however, the drilling pipe sticking may occur after drilling because of slight displacement of well wall caused by stress release. The sensitivity analyses exhibit that increasing the drilling fluid density and salinity may slightly accelerate hydrate dissociation, but these effects on wellbore stability is negligible. A significant increase in the drilling fluid temperature may be a disaster for maintaining the wellbore stability, and even cause secondary hydrate formation and well blowout. The model also shows that the wellbore instability can exacerbate with the decrease in the initial hydrate saturation and irreducible water saturation while the low permeability mud cake is conductive to reducing filtrate loss and facilitate the wellbore stability.
资助项目	Qingdao National Laboratory for Marine Science and Technology Open Fund[QNLM2016ORP0203] ; Key Research and Development Program of China[2017YFC0307600] ; Key Research and Development Program of China[2018YFE0126400] ; National Natural Science Foundation of China[41672367] ; National Natural Science Foundation of China[41976074] ; National Natural Science Foundation of China[51904280] ; Key Program of Marine Economy Development (Six Marine Industries) Special Foundation of Department of Natural Resources of Guangdong Province[GDNRC[2020]047] ; Open Research Fund Program of Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring (Central South University), Ministry of Education[2019YSJS14] ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan)[CUG190620] ; Open Research Fund Program of Engineering Research Center of Rock-Soil Drilling & Excavation and Protection, Ministry of Education[201908] ; National High-Level Talent Special Support Plan
WOS研究方向	Engineering ; Oceanography
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000696799400003
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/27913]
专题	中科院武汉岩土力学所
通讯作者	Ning, Fulong
作者单位	1.China Univ Geosci, Engn Res Ctr Rock Soil Drilling & Excavat & Prote, Fac Engn, Wuhan 430074, Peoples R China 2.Cent South Univ, Minist Educ, Key Lab Metallogen Predict Nonferrous Met & Geol, Changsha, Peoples R China 3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China 4.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 5.CNPC Engn Technol R&D Co Ltd, Beijing 102206, Peoples R China
推荐引用方式 GB/T 7714	Sun, Jiaxin,Ning, Fulong,Liu, Tianle,et al. Numerical analysis of horizontal wellbore state during drilling at the first offshore hydrate production test site in Shenhu area of the South China Sea[J]. OCEAN ENGINEERING,2021,238:24.
APA	Sun, Jiaxin.,Ning, Fulong.,Liu, Tianle.,Li, Yanlong.,Lei, Hongwu.,...&Jiang, Guosheng.(2021).Numerical analysis of horizontal wellbore state during drilling at the first offshore hydrate production test site in Shenhu area of the South China Sea.OCEAN ENGINEERING,238,24.
MLA	Sun, Jiaxin,et al."Numerical analysis of horizontal wellbore state during drilling at the first offshore hydrate production test site in Shenhu area of the South China Sea".OCEAN ENGINEERING 238(2021):24.