Sinker bar

Abstract

The sinker bar can have at least one pin with a shoulder that is at least 1.600 inches from the end of the pin to provide greater stability and easy make-up. The modified polished rod pin is capable of mating with a polished rod coupling.

What is claimed is: 
     
         1 . A sinker bar comprising:
 a body having a shoulder portion present on at least one end of the body;   a polished rod pin adjacent to the shoulder portion of the body, wherein the polished rod pin comprises a polished rod pin end opposite of the shoulder portion;   wherein the shoulder portion is located at least 1.600 inches from the end of the polished rod pin; and,   a gauge ring present on the polished rod pin, wherein the gauge ring is located between the shoulder portion and the polished rod pin end and is greater than about 1.4 inches from the polished rod pin end.   
     
     
         2 . The sinker bar of  claim 1 , wherein the shoulder portion forms a  45  degree angle to the gauge ring. 
     
     
         3 . The sinker bar of  claim 1 , further comprising a threaded connector portion of the polished rod pin. 
     
     
         4 . The sinker bar of  claim 3 , wherein the threaded connector portion forms a 9 degree angle to the gauge ring. 
     
     
         5 . The sinker bar of  claim 3 , wherein the threaded connector portion is in proximity to the gauge ring. 
     
     
         6 . The sinker bar of  claim 3 , wherein the threaded connector portion is in proximity to the polished rod pin end. 
     
     
         7 . The sinker bar of  claim 3 , wherein the threaded connector portion is between about 0.8 inches and 2.0 inches long. 
     
     
         8 . The sinker bar of  claim 1 , wherein the sinker bar is comprised of a bar stock consisting of at least one of carbon steel and alloy steel. 
     
     
         9 . The sinker bar of  claim 1 , wherein the sinker bar is comprised of bar stock that is hot-rolled and cold-drawn. 
     
     
         10 . The sinker bar of  claim 1 , wherein the gauge ring is located about 1.5 inches from the polished rod pin end. 
     
     
         11 . A sinker bar comprising:
 a body having a shoulder portion present on at least one end of the body;   a polished rod pin adjacent to the shoulder portion of the body, wherein the polished rod pin comprises a polished rod pin end opposite of the shoulder portion and a threaded connector portion; and,   a gauge ring present on the polished rod pin, wherein the gauge ring is located between the shoulder portion and the polished rod pin end, wherein the threaded connection portion forms a 9 degree angle to the gauge ring.   
     
     
         12 . The sinker bar of  claim 11 , wherein the shoulder portion forms a 45 degree angle to the gauge ring. 
     
     
         13 . The sinker bar of  claim 11 , wherein the threaded connector portion is in proximity to the gauge ring. 
     
     
         14 . The sinker bar of  claim 11 , wherein the threaded connector portion is in proximity to the polished rod pin end. 
     
     
         15 . The sinker bar of  claim 11 , wherein the shoulder portion is located at least 1.600 inches from the end of the polished rod pin. 
     
     
         16 . The sinker bar of  claim 11 , wherein the gauge ring is located between the shoulder portion and the polished rod pin end and is greater than about 1.4 inches from the polished rod pin end 
     
     
         17 . A method of preparing a production string comprising:
 attaching the sinker bar of  claim 11  to the production string;   attaching a sucker rod to the production string; and   attaching a pump to the production string.   
     
     
         18 . The method of preparing the production string of  claim 17 , wherein the shoulder portion forms a 45 degree angle to the gauge ring. 
     
     
         19 . The method of preparing the production string of  claim 17 , wherein the shoulder portion is located at least 1.600 inches from the end of the polished rod pin. 
     
     
         20 . The method of preparing the production string of  claim 17 , wherein the gauge ring is located about 1.5 inches from the polished rod pin end.