Reamer tool

Abstract

A reamer tool which is capable of removing paraffin scale, ice, salt, calcium, cement, barium and other accumulations from the inside surfaces of oil well pump tubing and casing, which reamer tool may include a housing for suspension in the well tubing or casing; a shaft slidably mounted in the housing for attachment to an impact device; shaft threads provided on the shaft; a lock nut threadibly mounted on the shaft for removably engaging the housing; and a reset spring provided in the housing between the housing and the end of the shaft. Displacement of the shaft in the housing causes the lock nut to engage the housing, and the lock nut rotates on the shaft threads and rotates the housing such that the housing rotates in the well bore or casing and removes the solid blockages from the well bore or casing.

Having described my invention with the particularity set forth above, what is claimed is:  
     
         1 . A reamer for use with an impact device in oil well tubing and casing, said reamer comprising: 
 a housing;    an elongated shaft slidably disposed between a first position and a second position in said housing, said shaft having shaft threads;    a lock nut threadibly engaging said shaft threads on said shaft for removably engaging said housing;    a reset spring provided in said housing adjacent to said shaft for biasing said shaft in said first position;    wherein said lock nut engages said housing, said shaft is rotatably stationary in said housing, said lock nut rotates on said shaft and said lock nut rotates said housing as said shaft is slidably displaced in a first direction between said first position and said second position in said housing by operation of the impact device; and    wherein said lock nut disengages said housing and rotation of said housing is terminated as said shaft is slidably displaced in a second direction between said first position and said second position in said housing by operation of the impact device.    
     
     
         2 . The reamer of  claim 1  comprising a plurality of lock nut lug seats provided on said housing and a plurality of lock nut lugs provided on said lock nut for removably engaging said plurality of lock nut lug seats, respectively.  
     
     
         3 . The reamer of  claim 1  wherein said housing comprises a top housing section, a middle housing section attached to said top housing section and a bottom housing section attached to said middle housing section.  
     
     
         4 . The reamer of  claim 3  comprising a plurality of lock nut lug seats provided on said housing and a plurality of lock nut lugs provided on said lock nut for removably engaging said plurality of lock nut lug seats, respectively.  
     
     
         5 . The reamer of  claim 1  comprising a shaft nut provided on said shaft for engaging said reset spring.  
     
     
         6 . The reamer of  claim 5  comprising a plurality of lock nut lug seats provided on said housing and a plurality of lock nut lugs provided on said lock nut for removably engaging said plurality of lock nut lug seats, respectively.  
     
     
         7 . The reamer of  claim 5  wherein said housing comprises a top housing section, a middle housing section attached to said top housing section and a bottom housing section attached to said middle housing section.  
     
     
         8 . The reamer of  claim 7  comprising a plurality of lock nut lug seats provided on said housing and a plurality of lock nut lugs provided on said lock nut for removably engaging said plurality of lock nut lug seats, respectively.  
     
     
         9 . A reamer for use with a wire line and impact device in oil well tubing and casing, said reamer comprising: 
 a housing having an upper housing end and a lower housing end;    a plurality of lock nut lug seats provided in said housing between said upper housing end and said lower housing end;    an elongated shaft slidably disposed in said housing, said shaft having an upper shaft end for attachment to the wire line, a lower shaft end spaced from said upper shaft end and shaft threads between said lower shaft end and said upper shaft end;    a lock nut threadibly engaging said shaft threads above said plurality of lock nut lug seats, said lock nut having a plurality of lock nut lugs for removably engaging said plurality of lock nut lug seats, respectively;    a reset spring provided in said housing, said reset spring interposed between said housing and said lower shaft end of said shaft;    wherein said shaft is slidably and non-rotatably displaced downwardly against said reset spring in said housing, said lock nut lugs of said lock nut engage said lock nut lug seats of said housing, said lock nut rotates on said shaft, and said lock nut rotates said housing when a load is applied to said shaft by operation of the impact device; and    wherein said reset spring slidably displaces said shaft upwardly in said housing, said lock nut lugs of said lock nut disengage said lock nut lug seats of said housing, and rotation of said housing is terminated when the load is removed from the shaft by operation of the impact device.    
     
     
         10 . The reamer of  claim 9  comprising a wiper ring provided in said housing and encircling said shaft for cleaning said shaft.  
     
     
         11 . The reamer of  claim 9  wherein said housing comprises a top housing section, a middle housing section attached to said top housing section and a bottom housing section attached to said middle housing section.  
     
     
         12 . The reamer of  claim 11  comprising a wiper ring provided in said housing and encircling said shaft for cleaning said shaft.  
     
     
         13 . The reamer of  claim 9  comprising a shaft nut provided on said shaft for engaging said reset spring.  
     
     
         14 . The reamer of  claim 13  comprising a wiper ring provided in said housing and encircling said shaft for cleaning said shaft.  
     
     
         15 . The reamer of  claim 13  wherein said housing comprises a top housing section, a middle housing section attached to said top housing section and a bottom housing section attached to said middle housing section.  
     
     
         16 . The reamer of  claim 15  comprising a wiper ring provided in said housing and encircling said shaft for cleaning said shaft.  
     
     
         17 . A reamer for use with a wire line and impact device in oil well tubing and casing, said reamer comprising: 
 a housing having an upper housing end and a lower housing end;    a plurality of lock nut lug seats provided in said housing between said upper housing end and said lower housing end;    an elongated shaft slidably disposed in said housing, said shaft having an upper shaft end for attachment to the wire line, a lower shaft end spaced from said upper shaft end and shaft threads between said lower shaft end and said upper shaft end;    a lock nut threadibly engaging said shaft threads beneath said plurality of lock nut lug seats, said lock nut having a plurality of lock nut lugs for removably engaging said plurality of lock nut lug seats;    a reset spring provided in said housing, said reset spring interposed between said housing and said lower shaft end of said shaft;    wherein said shaft and said shaft nut are displaced downwardly in said housing away from said plurality of lock nut lug seats when a load is applied to said shaft by operation of the impact device; and    wherein said reset spring slidably and non-rotatably displaces said shaft upwardly in said housing, said lock nut lugs of said lock nut engage said lock nut lug seats of said housing, said lock nut rotates on said shaft, and said lock nut rotates said housing when a load is released from said shaft by operation of the impact device.    
     
     
         18 . The reamer of  claim 17  wherein said housing comprises a top housing section, a middle housing section attached to said top housing section and a bottom housing section attached to said middle housing section.  
     
     
         19 . The reamer of  claim 17  comprising a shaft nut provided on said shaft for engaging said reset spring.  
     
     
         20 . The reamer of  claim 19  wherein said housing comprises a top housing section, a middle housing section attached to said top housing section and a bottom housing section attached to said middle housing section.