Method and system for enhancing the performance of a well tubular expansion assembly

The upward force exerted on an expansion cone (2), which is pulled up by a drill string (3) to expand a well tubular (1), is hydraulically enhanced by: - connecting a bottom plug (10) to a carrier body (11) below the expansion cone (2); - lowering the drill string (3), cone (2), carrier body (11), b...

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Bibliographische Detailangaben
1. Verfasser:	Zijsling, Djurre Hans
Format:	Patent
Sprache:	eng
Schlagworte:	EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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Beschreibung
Zusammenfassung:	The upward force exerted on an expansion cone (2), which is pulled up by a drill string (3) to expand a well tubular (1), is hydraulically enhanced by: - connecting a bottom plug (10) to a carrier body (11) below the expansion cone (2); - lowering the drill string (3), cone (2), carrier body (11), bottom plug (10) and unexpanded well tubular (1) assembly into a well; - inducing the drill string (3) to pull the expansion cone (2) through a lower edge (13) of the unexpanded well tubular (1) to expand said edge (13) and to subsequently pull the bottom plug (10) into sealing engagement with the expanded edge (13); - releasing the bottom plug (10) from the carrier body (11); - further pulling (F