Study on Sealing Failure of Wellbore in Bedded Salt Cavern Gas Storage

doi:10.1007/s00603-018-1571-5

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	Study on Sealing Failure of Wellbore in Bedded Salt Cavern Gas Storage
	Chen, Xiangsheng ; Li, Yinping ; Liu, Wei ; Ma, Hongling ; Ma, Jianli ; Shi, Xilin ; Yang, Chunhe
刊名	ROCK MECHANICS AND ROCK ENGINEERING
	2019
卷号	52 期号:1 页码:215-228
关键词	Bedded salt cavern storage Wellbore tightness test Leaking mudstone interlayer Permeability Leakage analysis
ISSN号	0723-2632
DOI	10.1007/s00603-018-1571-5
英文摘要	The wellbore tightness of a salt cavern gas storage must be tested before solution mining. According to the test results, it will be evaluated whether the wellbore can meet the cementing requirements of gas storage. However, there are many complex reasons that may cause wellbore leakage; hence, how to comprehensively analyze the test results and accurately expose the causes, locations, and scale of the leakage pose many challenges. These mainly include the incomplete test method and lack of theoretical analysis model. A nitrogen leak test was carried out for five wellbores that have been completed in Jintan (Jiangsu, China). The results show that two of them had leakage risk. To clarify the leakage causes and leakage types, we carried out an investigation of engineering geological data of the wellbores and further conducted laboratorial tests and theoretical analysis. The studies of drilling design and engineering geology show that the wellbores have good integrity and initially reveal that a mudstone interlayer intersecting the open hole between the casing shoe and the top of the salt cavern is a potential leaking layer. Furthermore, the permeability experiments and CT scans confirm that this mudstone interlayer is a leaking stratum and that the internal cracks develop severely. They are the key reasons leading to wellbore tightness failure. The proposed seepage theoretical model determines that the leakage type is horizontal flow in the mudstone interlayer. Comparing the theoretical results with the field test data, we find that the leakage rate curves of the two are in good agreement, which completely confirms that the mudstone interlayer is the fundamental cause of the wellbores tightness failure. This research not only identifies the leakage causes and leakage types of wellbores, but also enriches the leakage rate analysis method of gas storage and provides a theoretical and experimental analysis method for tightness evaluation of bedded salt cavern storage.
WOS研究方向	Engineering ; Geology
语种	英语
WOS记录号	WOS:000456673000014
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/15095]
专题	岩土力学所知识全产出_期刊论文
作者单位	1.Univ Chinese Acad Sci, Beijing 100000, Peoples R China; 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China; 3.Chongqing Univ, State Key Lab Coal Mine Disaster & Control, Chongqing 400044, Peoples R China
推荐引用方式 GB/T 7714	Chen, Xiangsheng,Li, Yinping,Liu, Wei,et al. Study on Sealing Failure of Wellbore in Bedded Salt Cavern Gas Storage[J]. ROCK MECHANICS AND ROCK ENGINEERING,2019,52(1):215-228.
APA	Chen, Xiangsheng.,Li, Yinping.,Liu, Wei.,Ma, Hongling.,Ma, Jianli.,...&Yang, Chunhe.(2019).Study on Sealing Failure of Wellbore in Bedded Salt Cavern Gas Storage.ROCK MECHANICS AND ROCK ENGINEERING,52(1),215-228.
MLA	Chen, Xiangsheng,et al."Study on Sealing Failure of Wellbore in Bedded Salt Cavern Gas Storage".ROCK MECHANICS AND ROCK ENGINEERING 52.1(2019):215-228.