E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 31/113 (2006.01) E21B 4/14 (2006.01)
Patent
CA 2270224
A hydraulic impact tool for use in a well, such as an oil or gas well, comprising a movable hammer which is arranged to prestress a spring by means of a hydraulic piston (16) provided with a through channel (20), and in which a movable sealing body (22, 45) is arranged to enable closing of the channel (43), so that hydraulic force from fluid under pressure applied to the impact tool, may displace the piston (16) and the hammer and prestress the spring, and in which the sealing body (22) is arranged to follow the piston (16) into an end position for so to open the channel (20) for throughput, so that the hydraulic force acting on the piston (16, 41) ceases, and the prestressed spring is released and drives the hammer to strike, at the same time as the piston (16, 41) returns to initial piston, whereafter the process is repeated. The sealing body (22) is arranged to close said channel (20) when the sealing body is subjected to a predetermined frictional force from fluid flowing through the impact tool.
Ce percuteur hydraulique, utile dans un puits de forage, tel qu'un puits de pétrole ou de gaz, comprend un marteau mobile, conçu pour mettre sous tension préalable un ressort, au moyen d'un piston hydraulique (16) doté d'un passage traversant (20), et dans lequel on a placé un corps de scellement mobile (22, 45), agencé de façon à permettre la fermeture du passage (43), afin que les forces hydrauliques provenant du fluide sous pression et appliquées sur le percuteur puissent déplacer le piston (16) et le marteau et mettre sous tension préalable le ressort. Ce percuteur est caractérisé en ce que le corps de scellement (22) est monté de manière à suivre le piston (16) jusqu'à une position terminale, afin d'ouvrir le passage (20), permettre le débit et faire cesser les forces hydrauliques agissant sur le piston (16, 41), et en ce que le ressort préalablement tendu est alors relâché et force le marteau à percuter, en même temps que le piston (16, 41) reprend sa position initiale, le processus se répétant ensuite. On a placé le corps de scellement (22) de manière à fermer le passage (20) lorsque le corps de scellement est soumis à des forces de friction déterminées provenant du fluide circulant à travers le percuteur.
Bakke Oil Tools As
Bakke Technology As
Ridout & Maybee Llp
LandOfFree
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