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 …