Hydraulic jar device

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 31/113 (2006.01)

Patent

CA 2436588

An arrangement by a hydraulic jar device, especially for use in underground wells, where the jar device is installed in a pipe string led down into the well, and designed so that e.g. a stuck object in the well may be loosened or broken up by upward or downward percussions from the jar device. The jar device is actuated by increasing the flow of drill fluid. Alternatively, the device is actuated by compression. A valve (27, 37, 38) closes off the flow of drill fluid, whereby a percussion cycle is initiated. The valve is designed so as also to seal during strong lateral accelerations.

La présente invention concerne un dispositif de coulisse de battage hydraulique destiné principalement à des puits de forage souterrains. En l'occurrence, cette coulisse de battage se monte sur une colonne de tubes descendue dans le puits. Le dispositif permet par conception de détacher ou de casser en plusieurs morceaux un objet coincé dans le puits, grâce à des mouvements de percussion vers le haut ou le bas depuis le dispositif de coulisse de battage. Pour mettre en oeuvre la coulisse de battage, on procède par augmentation du courant de fluide de forage. Selon un autre mode de réalisation, le dispositif se met en fonction sous l'effet d'un phénomène de compression. Dans ce cas, une vanne (27, 37, 38) coupe le courant de fluide de forage, ce qui a pour effet d'enclencher un cycle de percussion. En outre, la vanne est conçue pour se fermer à l'occasion de fortes accélérations latérales.

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