Method and system for tubing a borehole in single diameter

The invention concerns a method for casing a borehole which consists of successively lowering an unlimited plurality of strings of casing having a common diameter, the next one through the preceding one, to be installed one beneath the other and being sealingly connected. Thus a next casing ( 6 ) is...

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Bibliographische Detailangaben
1. Verfasser:	NOBILEAU PHILIPPE
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING ENGINEERING ELEMENTS AND UNITS FIXED CONSTRUCTIONS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING JOINTS OR FITTINGS FOR PIPES LIGHTING MEANS FOR THERMAL INSULATION IN GENERAL MECHANICAL ENGINEERING MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS PIPES SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	The invention concerns a method for casing a borehole which consists of successively lowering an unlimited plurality of strings of casing having a common diameter, the next one through the preceding one, to be installed one beneath the other and being sealingly connected. Thus a next casing ( 6 ) is lowered folded through the preceding casing ( 5 ) and the expansion process consists either in injecting pressurized fluid through the drillstring ( 54 ) towards the next casing ( 6 ) so as to re-inflate it, or the next casing ( 6 ) is a cylindrical pipe having a diameter smaller than the internal diameter of the preceding casing ( 5 ) and the expansion process consists in forcing a cylindrical gauge ( 52 ) from the top end ( 26 ) to the bottom bell ( 28 ) of the next casing ( 6 ) so as to increase its diameter to make it equal to the diameter of the preceding casing ( 5 ). The method can use a cementing shoe ( 34 ) and a metal-to-metal seal ( 29 ) between the casing string.