A jarring tool having an extensible joint connecting first and second sub ends. A first inner latch piece connects to the upper sub end, and a second outer latch piece connects to the lower sub end. The joint, in a latched position, has the outer latch piece latched to the inner latch piece and the
A jarring tool having an extensible joint connecting first and second sub ends. A first inner latch piece connects to the upper sub end, and a second outer latch piece connects to the lower sub end. The joint, in a latched position, has the outer latch piece latched to the inner latch piece and the inner and outer latch pieces restrained from unlatching by a stationary restraining collar. Under tensile force the joint unlatches into an unlatched position by the outer latch piece pulling the inner latch piece through the restraining collar into a position where the inner and outer latch pieces are free to separate. An impact force is generated from the tensile force when the joint unlatches and reaches a maximum extension.
대표청구항▼
1. A jarring tool comprising: an extensible joint connecting upper and lower sub ends, the joint comprising a first inner latch piece connected to the lower sub end, and a second outer latch piece connected to the upper sub end, and a stationary restraining collar restricting the inner and outer lat
1. A jarring tool comprising: an extensible joint connecting upper and lower sub ends, the joint comprising a first inner latch piece connected to the lower sub end, and a second outer latch piece connected to the upper sub end, and a stationary restraining collar restricting the inner and outer latch pieces from unlatching;wherein the joint, under tensile force, unlatches into an unlatched position by the inner latch piece pulling the outer latch piece through the restraining collar into a position where the inner and outer latch pieces are free to unlatch. 2. The jarring tool of claim 1, wherein the joint relatches into a latched position by the inner latch piece pushing the outer latch piece back through the restraining collar into a position where the inner and outer latch pieces are free to relatch. 3. The jarring tool of claim 1, wherein outer latch piece comprises a collet having a plurality of fingers with nubs along distal ends that contact a lip on the inner latch piece when being moved into the latched or unlatch positions through the restraining collar. 4. A jarring tool comprising: an extensible joint connecting upper and lower sub ends, the joint comprising a first inner latch piece connected to the upper sub end, and second outer latch piece connected to the lower sub end, and a stationary restraining collar;wherein the joint, in a latched position, has the outer latch piece latched to the inner latch piece and the inner and outer latch pieces restrained from unlatching by the restraining collar;wherein the joint, under tensile force, unlatches into an unlatched position by the outer latch piece pulling the inner latch piece through the restraining collar into a position where the inner and outer latch pieces are free to separate; andwherein an impact force is generated from the tensile force when the joint unlatches and reaches a maximum extension. 5. The tool of claim 4, wherein the joint relatches into a latched position by the outer latch piece pushing the inner latch piece back through the restraining collar into a position where the inner and outer latch pieces are free to relatch. 6. The tool of claim 4, wherein the outer latch piece comprises a collet device. 7. The tool of claim 4, wherein outer latch piece comprises a collet having a plurality of fingers with nubs along distal ends that contact a lip on the inner latch piece when being moved into the latched or unlatch positions through the restraining collar. 8. The tool of claim 4, wherein the outer latch piece is biased toward the inner latch piece by a coil spring. 9. The tool of claim 4, further comprising: a lower shaft interconnecting the inner latch piece to the lower sub end; anda lower stop slidably receiving the lower shaftwherein the impact force at maximum extension results from contact between the lower shaft and the lower stop. 10. The tool of claim 4, further comprising: an upper sub housing connected to the upper sub end;a lower sub housing;a center connector connecting the upper sub housing and the lower sub housing;an upper shaft slidably received through the center connector and connecting to the upper latch piece; anda plurality of springs biasing the upper shaft away from the center connector. 11. The tool of claim 10, wherein the restraining collar is attached in a fixed relationship to the lower sub housing. 12. The tool of claim 10, wherein the plurality of springs comprise a plurality of spring washers. 13. The tool of claim 12, further comprising a coil spring abutting the plurality of spring washers and a spring cage partially surrounding the coil spring. 14. The tool of claim 4, further comprising: a central passage defined through the extensible joint and through the upper and lower sub ends; andan electrical conductor carried within the central passage. 15. A jarring tool comprising: an upper housing and a lower housing joined at proximal ends by a center connector;a lower stop affixed to a distal end of the lower housing;an upper shaft slidingly engaged through the center connector from the upper housing to the lower housing and connecting to an inner latch piece in the lower housing, the upper shaft being biased against movement through the center connector, in the direction of the distal end of the lower housing, by a plurality of springs in the upper housing; anda lower shaft connected to an outer latch in the lower housing and slidably engaged through the lower stop; anda release sleeve affixed within the lower housing;wherein the inner and outer latch pieces are restrained from unlatching by the release sleeve until a tensile force acting on the lower shaft pulls the inner and outer latch pieces free of the release sleeve toward the distal end of the lower housing. 16. The jarring tool of claim 15, wherein the inner and outer latch pieces relatch when pushed through the release sleeve toward the upper housing by a compressive force on the lower shaft. 17. The jarring tool of claim 16, wherein a coil spring interconnects the upper shaft and the inner latch piece and biases the inner latch piece away from the upper shaft, the force of the spring being overcome by compressive forces to allow relatching of the inner and outer latch pieces. 18. The jarring tool of claim 15, further comprising upper and lower sub connectors attached to the distal end of the upper housing and the lower shaft, respectively. 19. The jarring tool of claim 15, wherein the lower shaft has a shoulder that contacts the lower stop when the tool is at a maximum extension resulting in a tensile jarring force along a length of the tool. 20. The jarring tool of claim 15, wherein a conductor path is defined through the upper and lower shafts and the inner and outer latch pieces.
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