Abstract
The purpose of this article is to provide some insight into the potential users of proprietary connections and to facilitate a rational selection process and procurement procedure. First, it must be noted that the standard and commonly used API casing connections [short, round thread casing and coupling (STC); long, round thread casing and coupling (LTC); buttress thread casing and coupling (BTC)] and API tubing connection EUE-8R (external upset ends, eight round thread tubing and coupling) can provide reliable service for the vast majority of well drilled and completed. Proprietary connections can and have been misapplied at considerable expense; for example, 9 5/8 drilling (intermediate/protective) casing. API BTC works more than adequately in drilling-mud environments. There is no need to use a proprietary connection for such service. In fact, pin nose metal-to-metal seal proprietary connections in this type of service can be less reliable than the API BTC connection since the metal-to-metal seal is much more damage prone than the thread seal of API BTC. Also, very reliable leak resistance, even to gas, is obtained with tin plated BTC couplings.
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