A hydraulic jar and an overpressure relief mechanism therefore

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 31/107 (2006.01) E21B 31/113 (2006.01)

Patent

CA 2681471

A hydraulic jar for a drilling assembly is disclosed. In some embodiments, the hydraulic jar includes a tubular housing, a mandrel disposed in the housing, an annulus between the mandrel and the housing, and a pressure relief mechanism disposed in the annulus. The pressure relief mechanism generally divides the annulus into first and second portions. The pressure relief mechanism includes first and second annular members in engagement with one another when the pressure in the second annulus portion is less than a predetermined value and a fluid flow path between the first and second annulus portions. The fluid flow path has a first size when the pressure in the second annulus portion is less than the predetermined value, and a second size that is larger than the first size when the pressure in the second annulus portion becomes equal to or greater than the predetermined value.

L'invention concerne une coulisse hydraulique pour un ensemble de forage. Dans certains modes de réalisation, la coulisse hydraulique comprend un logement tubulaire, un mandrin disposé dans le logement, un espace annulaire entre le mandrin et le logement, et un mécanisme de détente de pression disposé dans l'espace annulaire. Le mécanisme de détente de pression divise généralement l'espace annulaire en des première et seconde portions. Le mécanisme de détente de pression comprend des premier et second organes annulaires en prise l'un avec l'autre lorsque la pression dans la seconde portion d'espace annulaire est inférieure à une valeur prédéterminée et à un trajet d'écoulement de fluide entre les première et seconde portions d'espace annulaire. Le trajet d'écoulement de fluide a une première taille lorsque la pression dans la seconde portion d'espace annulaire est inférieure à la valeur prédéterminée, et une seconde taille qui est plus grande que la première taille lorsque la pression dans la seconde portion d'espace annulaire devient supérieure ou égale à la valeur prédéterminée.

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