Shakedown analysis on the integrity of cement sheath under deep and large-scale multi-section hydraulic fracturing

doi:10.1016/j.petrol.2021.109619

	Shakedown analysis on the integrity of cement sheath under deep and large-scale multi-section hydraulic fracturing
	Zhang, Xiaoyu 4,5; Bi, Zhenhui 3; Wang, Lei 5; Guo, Yintong 5; Yang, Chunhe 5; Yang, Guangguo 1,2
刊名	JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
	2022
卷号	208 页码:10
关键词	Deep shale gas Cement sheath Ideal elastoplastic Shakedown theory
ISSN号	0920-4105
DOI	10.1016/j.petrol.2021.109619
英文摘要	In the process of deep shale gas exploitation through horizontal drilling and large-scale multi-section hydraulic fracturing, the cement sheath can easily fail due to the high peak pressure and the frequent and violent fluctuations. In this paper, firstly, the deformation characteristics of the cement was studied based on the uniaxial and triaxial compression experiments at different temperature conditions. Then, mechanical model of cement sheath was set up. Based on Melan's shakedown theorem, shakedown load of the cement sheath under the periodic alternating loads is obtained and then converted to the internal pressure of the casing. Results shows that: (1) Compared with that at 25 degrees C, the compression resistance and elastic modulus of cement reduced significantly under 130 degrees C. The cement exhibits obvious plastic flow characteristics and can be regarded as a rational elasticplastic material. (2) During the cyclic loading and unloading process, new plastic strains are continuously generated, the width of hysteresis loops is continuously reduced, and the hysteresis loop becomes denser, which indicates that the accumulation rate of plastic deformation is continuously decreasing. (3) The shakedown load is the smaller of the loading and unloading yield pressures, and reverse yielding tend to occur in the depths. (4) The shakedown load of the cement sheath has a positive linear and non-linear relationship with the cohesive force and the friction angle, respectively. (5) the shakedown load has a positive linear relationship with the external pressure. The external pressure, as the most influence of the calculation result of the shakedown load, accounts for close to 80%. The research could provide valuable theoretical and engineering guidance for the design and construction of shale gas well cement.
资助项目	National Natural Science Foundation of China[52104010] ; Sinopec Science and Technology Department Project[P21056]
WOS研究方向	Energy & Fuels ; Engineering
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000710878400105
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/28258]
专题	中科院武汉岩土力学所
通讯作者	Zhang, Xiaoyu
作者单位	1.Sinopec Res Inst Petr Engn, Beijing 100101, Peoples R China 2.State Key Lab Shale Oil & Gas Enrichment Mech & E, Beijing 100101, Peoples R China 3.Chongqing Univ, Chongqing 400030, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Xiaoyu,Bi, Zhenhui,Wang, Lei,et al. Shakedown analysis on the integrity of cement sheath under deep and large-scale multi-section hydraulic fracturing[J]. JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,2022,208:10.
APA	Zhang, Xiaoyu,Bi, Zhenhui,Wang, Lei,Guo, Yintong,Yang, Chunhe,&Yang, Guangguo.(2022).Shakedown analysis on the integrity of cement sheath under deep and large-scale multi-section hydraulic fracturing.JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,208,10.
MLA	Zhang, Xiaoyu,et al."Shakedown analysis on the integrity of cement sheath under deep and large-scale multi-section hydraulic fracturing".JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING 208(2022):10.