Slim-hole parasite string

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 21/12 (2006.01) E21B 17/00 (2006.01) E21B 17/18 (2006.01) E21B 21/14 (2006.01)

Patent

CA 2711238

A system for drilling a well having a wellbore includes a first pipe string positioned in the wellbore with a first annulus being present between the first pipe string and the wellbore. A second pipe string, smaller in diameter than the first pipe string, is positioned within the first pipe string to form a second annulus between the first pipe string and the second pipe string. The second pipe string is configured to be attached to a drill bit. A first rotator is operably associated with the first pipe string to rotate the first pipe string in a first direction at a first speed, and a second rotator is operably associated with the second pipe string to rotate the second pipe string in a second direction at a second speed.

L'invention concerne un système de forage d'un puits ayant un trou de forage comprenant un premier train de tiges positionné dans le puits de forage, un premier espace annulaire étant présent entre le premier train de tiges et le puits de forage. Un second train de tiges, d'un diamètre plus petit que le premier train de tiges, est positionné dans le premier train de tiges pour former un second espace annulaire entre le premier train de tiges et le second train de tiges. Le second train de tiges est configuré pour être relié à un trépan. Un premier dispositif de rotation est associé de manière fonctionnelle au premier train de tiges pour faire tourner le premier train de tiges dans une première direction à une première vitesse, et un second dispositif de rotation est associé de manière fonctionnelle au second train de tiges pour faire tourner le second train de tiges dans une seconde direction à une seconde vitesse.

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