E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/29
E21B 31/107 (2006.01)
Patent
CA 1157460
DOWNHOLE FISHING JAR MECHANISM ABSTRACT OF THE DISCLOSURE A downhole fishing jar mechanism for freeing stuck objects within a well bore which incorporates a housing structure defining an internal anvil element through which an upwardly-directly impact force is adapted to be trans- mitted to the body structure. A striker element, incorpor- ated with an elongated operator element is adapted to strike the anvil with an impact force that is controlled by means of an adjustable compression spring. A spherical detente- type latching mechanism is adapted to establish a releasable interconnection with the operator element and further is operative to transmit the compression of the spring to the operator element. The latch mechanism releases automatically upon predetermined upward movement of the operator element and latch mechanism within the body structure, thereby allow- ing the operator element to move upwardly and cause the striker to impart a predetermined impact force to the anvil. The latch mechanism is capable of being automatically reset upon simple downward movement of the operator element, thus promoting repetitive jarring simply by controlled upward and downward movement of the operator element through actuation of surface-controlled equipment.
361633
Gowling Lafleur Henderson Llp
Taylor William T.
LandOfFree
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