Method of drilling an ultra-short radius borehole

E - Fixed Constructions – 21 – B

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E21B 7/06 (2006.01)

Patent

CA 2445085

A method of drilling a borehole into an earth formation using a drill string having an upper part (16a) and a lower part (16b) which is more flexible than the upper part, the method comprising drilling a first section of the borehole, drilling a second section of the borehole from said first borehole section, said second section extending at a selected inclination angle relative the first section. During drilling of the second section the drill string is lowered through the borehole in a manner that the upper drill string part remains in the first section and the lower drill string part extends into the second borehole section.

L'invention concerne un procédé permettant de réaliser un trou de forage dans une formation terrestre à l'aide d'un train de tiges comportant une partie supérieure (16a) et une partie inférieure (16b) qui est plus flexible que la partie inférieure. Ce procédé consiste à réaliser une première section du trou de forage, à réaliser une seconde section du trou de forage à partir de ladite première section de trou de forage, cette seconde section s'étendant à un angle d'inclinaison sélectionné par rapport à la première section. Pendant la réalisation de la seconde section, le train de tiges est abaissé à travers le trou de forage de telle sorte que la partie supérieure du train de tiges reste dans la première section et la partie inférieure du train de tiges s'étende dans la seconde section du trou de forage.

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