Multi-purpose well servicing apparatus
An apparatus for cleaning the inner wall of wellbores and for capturing downhole wellbore debris. An elongated, tubular central mandrel is provided with recesses on its outer surface. Various service elements are interchangeably mounted over the split rings. The various service elements include stabilizers, brush assemblies, junk baskets and magnets.
1. An improved well service tool, having an elongated, central hollow mandrel with threaded connections on either end, first and second axially spaced circumferential recesses formed in the exterior surface of the mandrel; split rings, removably mounted around the mandrel in the recesses; a stabilizer element mounted over the exterior of each split ring; and a cylindrical service element, removably disposed around the central mandrel between the stabilizer elements, and
wherein the improvement comprises a third circumferential recess in the exterior surface of the mandrel, the third recess positioned axially between the first and second recess, a third split ring, removably mounted around the mandrel in the recess; a third stabilizer element mounted over the exterior of the third split ring service element, removably disposed around the central mandrel and position between the adjacent stabilizers.
2. The well service tool of claim 1 , wherein the split rings comprise an outer circumferential ball race, the stabilizer elements comprise a mating inner circumferential ball race, and further comprising a plurality of balls disposed in the mating ball races, whereby the stabilizer elements are rotatable with respect to the central mandrel.
3. The well service tool of claim 1 , wherein the service elements comprise brushes.
4. The well service tool of claim 3 , wherein the split rings comprise an outer circumferential ball race, the stabilizer elements comprise a mating inner circumferential ball race, and additionally comprising a plurality of balls disposed in the mating ball races, whereby the stabilizer elements are rotatable with respect to the central mandrel.
5. The well service tool of claim 1 , wherein the service element comprises a junk basket.
6. The well service tool of claim 5 , wherein the split rings comprise an outer circumferential ball race, the stabilizer elements comprise a mating inner circumferential ball race, and additionally comprising a plurality of balls disposed in the mating ball races, whereby the stabilizer elements are rotatable with respect to the central mandrel.
7. The well service tool of claim 1 , wherein the service element comprises a magnet.
8. The well service tool of claim 7 , wherein the split rings comprise an outer circumferential ball race, the stabilizer elements comprise a mating inner circumferential ball race, and additionally comprising a plurality of balls disposed in the mating bail races, whereby the stabilizer elements are rotatable with respect to the central mandrel.
9. The well service tool of claim 1 , wherein each split ring comprises two semi-cylindrical sections.
10. The well servicing tool of claim 9 , wherein the inner profile of the split rings have mating, rotationally interfering surfaces which prevent split rings from rotating on the mandrel.
11. The well service tool of claim 1 , wherein the service elements comprises wellbore contacting elements.
12. The well service tool of claim 1 , wherein each of the circumferential recesses comprises an annular groove in the exterior surface of the mandrel.
13. The well service tool of claim 1 , wherein the axial position of the third recess is substantially centered between the first and second recesses.
14. A method of servicing a wellbore at a subterranean location, comprising the steps of:
providing a well servicing tool, configured to comprise an elongated, central hollow mandrel with threaded connections on either end, an intermediate circumferential recesses formed in the exterior surface of the mandrel between two axially spaced circumferential recesses formed in the exterior surface of the mandrel; split rings, removably mounted an the mandrel in the recesses; stabilizer elements, removably mounted over the exterior of each split ring; and cylindrical-shaped first and second service elements, removably mounted on the central mandrel between the adjacent stabilizer elements, and wherein the method comprises:
moving the well servicing tool into and out of the wellbore to service the wellbore;
thereafter reconfiguring the servicing tool, the reconfiguration comprising removing from the mandrel the stabilizer element mounted over the split ring in the intermediate recess and removing from the mandrel the first and second service elements; without reinstalling the stabilizer at the intermediate recess, removably installing a third cylindrical service element on the central mandrel positioned between the two remaining stabilizer elements; and
moving the reconfigured well servicing tool into and out of the wellbore to service the wellbore.
15. The wellbore servicing method of claim 14 , wherein each of the circumferential recesses comprises an annular groove in the exterior surface of the mandrel.
16. The well servicing method of claim 15 , wherein each split ring comprises two semi-cylindrical sections.
17. The wellbore servicing method of claim 16 , wherein the split rings comprise an outer circumferential bail race, the stabilizer elements comprise a mating inner circumferential ball race, and additionally comprising a plurality of balls disposed in the mating ball races, whereby the stabilizer elements are rotatable with respect to the central mandrel.
18. The wellbore servicing method of claim 14 , wherein the inner profile of the split rings have mating, rotationally interfering surfaces which prevent split rings from rotating on mandrel.
19. The wellbore servicing method of claim 14 , wherein the axial position of the third recess is substantially centered between the first and second recesses.
20. The wellbore servicing method of claim 14 , wherein the split rings comprise an outer circumferential ball race, the stabiliser elements comprise a mating inner circumferential ball race, and additionally comprising a plurality of balls disposed in the mating ball races, whereby the stabilizer elements are rotatable with respect to the central mandrel.
21. The wellbore servicing method of claim 14 , wherein one of the first and second service elements comprises brushes.
22. The wellbore servicing method of claim 14 , wherein the third service element comprises a junk basket.
23. The wellbore servicing method of claim 14 , wherein the third service element comprises a magnet.
24. The wellbore servicing method of claim 14 , additionally comprising the step of returning the well servicing tool to said well servicing tool's unreconfigured configuration after the reconfigured tool is moved out of the wellbore.
25. The wellbore servicing method of claim 14 , wherein a service element comprises wellbore, contacting elements.