Downhole drill string having a collapsible subassembly

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 31/00 (2006.01) E21B 17/05 (2006.01) E21B 17/10 (2006.01) E21B 31/03 (2006.01) E21B 31/107 (2006.01) E21B 37/02 (2006.01)

Patent

CA 2492746

A method and apparatus for allowing a downhole drill string to be stuck at one location and continue to rotate above the stuck section. The apparatus provides a method for collapsing the stuck subassembly by reducing its outside diameter. Simultaneous with the subassembly collapse, a jarring action is initiated from within the drill string to further loosen the stuck sections. At the same time drilling fluid inside the string is allowed to circulate outside the string through a circulation sub. The fluid is forced around the stuck subassembly further increasing the likelihood that the subassembly will be freed.

La présente invention concerne un procédé et un appareil devant permettre à un train de tiges à marteau de fond de trou coincé en un endroit de continuer à tourner au-dessus du point d'arrêt. L'appareil permet la mise en oeuvre d'un procédé par lequel le sous-ensemble se rentre partiellement en diminuant son diamètre extérieur. En même temps que le sous-ensemble se rentre partiellement, on produit un effet de battage depuis l'intérieur du train de tiges de façon à libérer de l'emprise les segments bloqués. En même temps également, le fluide de forage à l'intérieur du train de tiges est mis à circuler à l'extérieur de la tige en passant par une réduction à circulation. Le fluide est forcé à circuler autour du sous-ensemble bloqué, ce qui augmente d'autant l'éventualité du déblocage du sous-ensemble.

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