Due to limited crane capability, some coiled tubing (CT) strings are transported in two or three sections to offshore locations, requiring the use of welding or mechanical connectors for reassembly. CT utilization subsequently can be hampered by welding issues as well as lack of integrity of the connectors. Field welding techniques and commercially available spoolable connectors can decrease the fatigue life of CT string to 35-70% of the base tube. This paper describes the development of a mechanical spoolable connector with a fatigue life as good as that of the base pipe. The connector was designed using extensive nonlinear finite element analysis (FEA) design iterations. The connector pressure rating is equal to that of the pipe, and the connector maintains its sealing ability throughout the fatigue life of the pipe-even on very aggressive radius drums and tubing guides. The connector conforms very well when spooled to the drum without 'sticking out.' The connector assembly OD fits flush with the CT string, providing continuous gripper engagement. Single or multiple connectors can be used to join sections of coiled tubing in the yard or on location. The new connector uses material certified for sour wells and acid jobs, and its seals are compatible with a variety of chemicals, acids, and sour service conditions. In addition, the testing of the connector is discussed. The connector design performed very well according to several prototype tests on a fatigue machine and full-scale yard test. The results demonstrate that the new spoolable connector can increase the utilization of CT with various configurations and enable operations previously not deemed feasible due to various limitations imposed by other joining techniques.
Development of a high-performance spoolable connector
Entwicklung eines wickelbaren Hochleistungs-Verbinders
2008
9 Seiten, 7 Quellen
Aufsatz (Konferenz)
Englisch
Messwandler , Ingenieur , Ausstellung , Materialermüdung , Finite-Elemente-Methode , Entwurf , Erdölraffinerie , Verrohrung , Schweißen , Gestaltung , Iterationsverfahren , Betriebsbedingung , Erdöl , Erdölabbau , Erdölbohranlage , Erdölbohrung , Ermüdung , Rohrverbindung (Rohrkupplung) , Wickelrohr (Bohrgestänge) , Biegsamkeit , Wickelrohrbohren
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