Hydraulically driven fishing jars

Details Hydraulically driven fishing jars Hydraulically driven fishing jars

E - Fixed Constructions

21

B

E21B 31/113 (2006.01)

Patent

CA 2383929

A fishing jar (11) is placed in a work string for delivering blows to a stuck object in a well. This fishing jar (11) utilizes energy stored in the work string for delivering the blow, rather than having a main spring of its own. The fishing jar (11) uses hydraulic pressure to move a piston member (35). The piston member (35) engages a firing member (75) when it reaches one end of its stroke. The directional valve (45) then directs fluid to the other side of the piston (35) to cause the piston (35) to move in the opposite direction. When it starts to move in the opposite direction, the firing member (75) will provide a restrictive load against that movement. Once the pressure builds to a high enough level, it will move the housing (13) relative to the piston (35), which is restricted from movement by the firing member (75). When the housing (13) moves, it elastically deforms the work string, storing energy in the work string. The firing member (75) will release the housing (13) once the housing (13) reaches the end of its stoke. The housing (13) has a hammer surface (97) that strikes an anvil (95) once released.

L'invention concerne une coulisse de repêchage (11) placée dans une colonne de production pour délivrer des coups à un objet coincé dans un puits. Ladite coulisse (11) utilise l'énergie emmagasinée dans la colonne pour délivrer ces coups, au lieu d'être équipée d'un ressort propre. La coulisse (11) fait appel à la pression hydraulique pour déplacer un piston (35), lequel sollicite un percuteur (75) en fin de course. Ensuite, la valve de direction (45) oriente le fluide vers l'autre côté du piston (35), qui se déplace dans la direction opposée. Au début de ce déplacement dans la direction opposée, le percuteur (75) établit une charge restrictive contre le déplacement. Lorsque la pression atteint un niveau suffisamment élevé, l'enveloppe (13) se déplace par rapport au piston (35), dont le mouvement est limité par le percuteur (75). En se déplaçant, l'enveloppe (13) déforme la colonne de manière élastique, et la colonne emmagasine de l'énergie. Le percuteur (75) libère l'enveloppe (13) lorsque celle-ci arrive en fin de course. L'enveloppe (13) comporte une surface de marteau (97) qui frappe une enclume (95) au moment de la libération.

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