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Title : Analysis of Casing Connections Subjected to Thermal Cycle Loading
Company : SIMULIA
File Name : analysis-casing-connections-thermal-cycle-loading-2010.pdf
Size : 27463
Type : application/pdf
Date : 09-Jul-2011
Downloads : 2

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Production of heavy oil and bitumen, which is increasing around the world as conventional oil resources are depleted, often uses thermal well technologies such as Cyclic Steam Stimulation (CSS) and Steam Assisted Gravity Drainage (SAGD). Casing connections are one of the most critical components in thermal wells. Historically, the literature shows that over 80% of reported uphole casing failures experienced in thermal wells occurred at connections. Typical connection failure mechanisms include structural damages, such as parting, thread rupture, and shoulder plasticity, and serviceability damages, such as leakage. One of the critical load conditions causing casing and casing connection failures is the thermal cycle loading, with high peak temperatures typically in excess of 200°C, which can cause the well casing and casing connections to deform plastically. There are generally three types of connections used in intermediate or production casing of thermal wells: API (American Petroleum Institute) round, API buttress and proprietary premium connections. This paper presents finite element analysis of these three types of casing connections subjected to thermal cycle loading. Based on analysis results, this paper demonstrates that the premium connection, which has a metal-to-metal seal region, is the most suitable of these three connection designs for the use in thermal wells, in terms of structural integrity and sealability. This paper also presents recommendations for casing connection design for successful service in thermal well applications.
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