Multi-Purpose Well Servicing Apparatus

Abstract

Apparatus for cleaning the inner wall of wellbore tubulars, and for capturing downhole debris in the wellbore An elongated, tubular central mandrel has threaded connections on either end for makeup into a tubular string The mandrel has recesses on its outer circumference into which split rings are mounted Various service elements are then attachable to the central mandrel, by sliding them over the mandrel and holding them in place with stabilizer elements which connect to the split rings Different embodiments of the service elements include a brush assembly, a junk basket, and a magnet The stabilizer elements may be mounted onto the split rings so as to either be rotationally locked with respect to the mandrel, or so as to be capable of rotating with respect to the mandrel, since the service elements are held in place on the central mandrel by the stabilizer elements.

1 . A well service tool, comprising:
 a) an elongated central mandrel having a longitudinal bore and threaded connections on either end, and one or more circumferential recesses on an exterior surface;   b) one or more split rings removably mounted in said one or more circumferential recesses on said central mandrel;   c) one or more stabilizer elements mounted on said one or more split rings; and   d) one or more service elements removably disposed around said central mandrel and held in place by said one or more stabilizer elements.   
     
     
         2 . The well service tool of  claim 1 , wherein said one or more service elements comprises a brush assembly. 
     
     
         3 . The well service tool of  claim 2 , comprising a plurality of brush assemblies. 
     
     
         4 . The well service tool of  claim 2 , wherein said split rings comprise outer circumferential ball races, said stabilizer elements comprise mating inner circumferential ball races, and further comprising a plurality of balls disposed in said mating ball races, whereby said stabilizer elements can rotate with respect to said central mandrel. 
     
     
         5 . The well service tool of  claim 1 , wherein said service element comprises a junk basket. 
     
     
         6 . The well service tool of  claim 5 , wherein said split rings comprise outer circumferential ball races, said stabilizer elements comprise mating inner circumferential ball races, and further comprising a plurality of balls disposed in said mating ball races, whereby said stabilizer elements can rotate with respect to said central mandrel. 
     
     
         7 . The well service tool of  claim 1 , wherein said service element comprises a magnet. 
     
     
         8 . The well service tool of  claim 7 , wherein said split rings comprise outer circumferential ball races, said stabilizer elements comprise mating inner circumferential ball races, and further comprising a plurality of balls disposed in said mating ball races, whereby said stabilizer elements can rotate with respect to said central mandrel.