Polished rod with latching section

Abstract

A polished rod for supporting a sucker rod string comprising a one piece shank with an upper end and a lower end. A first connector is formed on the upper end of the shank and a second connector is formed on the lower end of the shank. The shank has a sealing section extending from the lower end toward the upper end and the sealing section has a polished surface and a uniform cylindrical diameter substantially equal to the diameter of the upper end and the lower end of the shank. The shank further has a latching section formed between the sealing section and the upper end. The latching section of the shank has a diameter less than the diameter of the sealing section and the upper end.

1 . A polished rod for supporting a sucker rod string, comprising:
 a one piece shank having an upper end and a lower end, the upper end and lower end each having a diameter;   a first connector formed on the upper end of the shank; and   a second connector formed on the lower end of the shank,   wherein the shank has a sealing section extending from the lower end toward the upper end, the sealing section having a polished surface and a uniform cylindrical diameter substantially equal to the diameter of the upper end and the lower end of the shank,   wherein the shank has a latching section formed between the sealing section and the upper end, the latching section of the shank having a diameter less than the diameter of the sealing section and the upper end.   
     
     
         2 . The polished rod of  claim 1  wherein the length of the latching section is less than the length of the sealing section. 
     
     
         3 . The polished rod of  claim 1  wherein the latching section has a cylindrical cross-section. 
     
     
         4 . The polished rod of  claim 1  wherein the polished surface has a surface finish in a range of about 8 μin. to about 32 μin. 
     
     
         5 . A polished rod for supporting a sucker rod string, comprising:
 a one piece shank having an upper end and a lower end, the upper end and lower end each having a diameter;   a first threaded rod pin formed on the upper end of the shank; and   a second threaded rod pin formed on the lower end of the shank,   wherein the shank has a sealing section extending from the lower end toward the upper end, the sealing section having a polished surface and a uniform cylindrical diameter substantially equal to the diameter of the upper end and the lower end of the shank,   wherein the shank has a latching section formed between the sealing section and the upper end, the latching section of the shank having a diameter less than the diameter of the sealing section and the upper end.   
     
     
         6 . The polished rod of  claim 5  wherein the length of the latching section is less than the length of the sealing section. 
     
     
         7 . The polished rod of  claim 5  wherein the latching section has a cylindrical cross-section. 
     
     
         8 . The polished rod of  claim 5  wherein the polished surface has a surface finish in a range of about 8 μin. to about 32 μin.