Patent ID: 6866096

Claim:
A line downhole jarring tool having a top end and a bottom end comprising a: a. hammer mandrel having a top portion and a bottom portion, disposed near said top end of said jarring tool comprising a: i. hammer portion disposed toward said top portion of said hammer mandrel; ii. releasable bolt disposed toward said bottom portion of said hammer mandrel; and iii. shaft disposed between said top portion and said releasable bolt of said hammer mandrel; b. retaining mandrel shaped to envelop a substantial portion of said shaft; c. said retaining mandrel having an aligning collar positioned toward said top end of said jarring tool configured to engage said shaft such that said shaft cannot be significantly rotated relative to said retaining mandrel; d. collet having a first end and a second end, said second end disposed toward said bottom end of said jarring tool having a predetermined diameter, and said first end disposed toward said top end of said jarring tool and having a larger diameter than that of said second end, and said collet having longitudinal slits along substantially the entire length of said collet, configured to permit radial expansion, and shaped to operatively engage said releasable bolt; e. firing mandrel having a first section and a second section, wherein said first section is disposed toward said bottom end of said jarring tool and having an inner diameter shaped to receive said collet, wherein said second section is shaped to operatively receive said retaining mandrel and disposed toward said top end of said jarring tool having an inner diameter larger than that of said first section forming a cavity, such that said second section permits the release of said releasable bolt by accommodating said collet when said collet radially expands in said cavity; f. reloading mechanism disposed between the collet and said middle joint configured to urge said collet toward said top of said jarring tool; g. kinetic energy shaft having first and second opposite ends, said first opposite end disposed toward top end of said jarring tool, wherein said collet is attached to said first opposite end; h. kinetic energy srore configured to operatively engage a substantial portion of said kinetic energy shaft; i. a bottom mandrel shaped to house said kinetic energy shaft; j. adjuster collar attached to said second opposite end of said kinetic energy shaft and configured to move up and down said kinetic energy shaft; k. collar guard operatively attached to said bottom mandrel and configured to accommodate said adjuster collar and shaped to have an opening configured to permit access to said adjuster collar when said collar guard is rotated about the axis of said kinetic energy shaft; and l. middle joint having first end and second end and shaped to operatively engage said firing mandrel on said first end and shaped to operatively receive said bottom mandrel on said second end.