Patent ID: 7267176

Claim:
An improved jar tool for delivering tools, including electronic packages, into wellbores and for retrieving tools stuck in the wellbore, comprising: said jar tool includes upper and lower spaced housings having confronting spaced ends coupled together by a lost motion coupling for limited movement of the housings toward and away from one another along a common axis, and opposed ends opposed to one another and to the lost motion coupling; a closure member forming attachment means at each opposed end of the upper and the lower housings, respectively, for supporting and running the jar tool into and out of a wellbore and for attaching tools thereto; and confronting closure members at the confronting ends of the housings; shaft having opposed ends reciprocatingly received respective the upper housing; said upper housing having axially aligned annular stored energy chambers formed respective said shaft and said housing; biasing means supported within each annular stored energy chambers, including springs having different spring characteristics; transfer members extending from said shaft for engaging and compressing said biasing means to thereby store energy therewithin responsive to relative movement of said shaft respective said upper housing; a releasable latch means interconnecting the shaft and lost motion coupling and for releasing the shaft respective the lost motion coupling upon demand after storing energy within the biasing means, thereby enabling acceleration of the upper housing away from the lower housing; a hammer and anvil, respectively, positioned within the upper housing on a confronting closure member and on the lost motion coupling, respectively; an axial passageway formed through said upper housing, and continues on through the lost motion coupling into the lower housing, a protective tubing having ends with one end affixed respective the upper housing and the other end terminating within a chamber formed in the lower housing; said tubing is slidably received within the passageway, an electrical conductor extending through the tubing and having an end adapted to be connected to a conductor extending uphole from the upper housing, and another end being received within the chamber formed within the lower housing where the conductor is provided with a surplus length to provide for the length of the stroke occasioned by reciprocation of the upper housing respective the lower housing, the last said end of the conductor terminating in a connector adapted to be connected to apparatus supported respective said lower housing.