Wellbore overshot

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 31/18 (2006.01)

Patent

CA 2286189

An overshot (100) is provided for engaging and retrieving a collapsed coiled tubing in a wellbore. In one aspect the overshot has a body member (102) with a top, a bottom, and a body channel (109, 110, 111, 112) therethrough from top to bottom, the body member having a slip chamber (123, 124), at least one slip (121, 122) movably disposed in the slip chamber of the body member, and movable on at least one inclined rail (130) in the slip chamber so that, upon contacting the collapsed coiled tubing, upward movement of the body member results in downward movement of the at least one slip (121, 122) which also moves the at least one slip inwardly in the body member (102) thereby increasing gripping force of the at least one slip on the collapsed coiled tubing. Methods are also provided for using such overshots.

L'invention concerne une cloche de repêchage servant à introduire et à retirer un tube de production affaissé et enroulé dans un puits de forage. Dans un aspect, cette cloche de repêchage possède un corps présentant une partie supérieure, une partie inférieure, un passage le traversant de haut en bas, une chambre contenant les coins de retenue, au moins un coin de retenue situé mobile dans la chambre et mobile sur au moins un rail incliné dans ladite chambre, de sorte que, au moment du contact avec le tube de production affaissé et enroulé, le déplacement vers le haut du corps provoque le déplacement vers le bas du ou des coins de retenue, ainsi que le déplacement dudit ou desdits coins de retenue vers l'intérieur dans le corps, ce qui augmente, par conséquent, la force de serrage dudit ou desdits coins de retenue sur le tube de production affaissé et enroulé. Elle concerne également des procédés d'utilisation de ce type de cloche de repêchage.

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