Logging While Pulling

Abstract

The disclosure includes a system, method, and tool for logging while pulling. The disclosed system includes a tool and a bottom hole assembly, and the tool engages with the bottom hole assembly. The tool includes an elongated body, a retarder positioned on the elongated body, and a locking ring positioned on the elongated body. The retarder has at least one point of contact with an interior surface of a drill pipe. The disclosed method includes assembling the tool, providing a landing ring on a bottom hole assembly, free dropping the tool to the bottom hole assembly, and engaging the landing ring of the bottom hole assembly with the locking ring of the tool so that a portion of the tool extends below the bottom hole assembly.

1 . A system comprising:
 a tool having an elongated body, a retarder positioned on the elongated body, and a locking ring positioned on the elongated body; and   a bottom hole assembly, wherein the tool is engaged with the bottom hole assembly.   
     
     
         2 . The system of  claim 1 , wherein the bottom hole assembly comprises a drill bit having a central opening. 
     
     
         3 . The system of  claim 2 , wherein at least a portion of a lower section of the elongated body of the tool extends through the central opening of the drill bit when the tool is engaged with the bottom hole assembly. 
     
     
         4 . The system of  claim 3 , wherein the lower section of the elongated body comprises logging subs having sensors which are operational only in unlined boreholes. 
     
     
         5 . The system of  claim 2 , wherein the bottom hole assembly further comprises:
 a drill collar;   a locking sub connected to the drill collar; and   a saver sub connected to an end of the locking sub opposite the drill collar, wherein the drill bit is connected to an end of the saver sub opposite the locking sub.   
     
     
         6 . The system of  claim 5 , wherein the locking sub comprises a landing ring configured to engage the locking ring of the tool. 
     
     
         7 . The system of  claim 1 , wherein the tool is engaged with the bottom hole assembly after the tool free drops to the bottom hole assembly. 
     
     
         8 . The system of  claim 1 , wherein the retarder comprises at least one point of contact with an interior surface of a drill pipe. 
     
     
         9 . A method comprising:
 assembling a tool having a locking ring and a retarder positioned on an elongated body of the tool;   providing a landing ring on a bottom hole assembly;   free dropping the tool to the bottom hole assembly; and   engaging the landing ring of the bottom hole assembly with the locking ring of the tool so that a portion of the tool extends below the bottom hole assembly.   
     
     
         10 . The method of  claim 9 , further comprising:
 logging data while pulling the engaged tool and bottom hole assembly upward through a borehole.   
     
     
         11 . The method of  claim 10 , wherein logging data while pulling comprises:
 stacking sonic signals during a stationary period.   
     
     
         12 . The method of  claim 11 , wherein stacking sonic signals comprises:
 adding together from about 10 to about 20 pulses from the tool during the stationary period.   
     
     
         13 . The method of  claim 10 , further comprising:
 recovering the logged data.   
     
     
         14 . The method of  claim 9 , further comprising:
 lifting a drill bit of the bottom hole assembly above the base of a borehole a distance approximately equal to a length of a portion of the tool below the locking ring of the tool minus a distance of the opposite end of the drill bit to the landing ring of the locking sub.   
     
     
         15 . The method of  claim 9 , further comprising:
 extending the portion of the tool below a drill bit of the bottom hole assembly in an unlined borehole, wherein the portion includes sensors that operate only in unlined boreholes.   
     
     
         16 . A tool comprising:
 an elongated body;   a retarder positioned on the elongated body, wherein the retarder comprises at least one point of contact with an interior surface of a drill pipe; and   a locking ring positioned on the elongated body.   
     
     
         17 . The tool of  claim 16 , wherein the elongated body comprises an upper section and a lower section, wherein the upper section comprises at least one logging sub which is operational in lined boreholes, wherein the lower section comprises at least one logging sub which is operational only in unlined boreholes 
     
     
         18 . The tool of  claim 17 , wherein the locking ring is positioned on the elongated body between the logging subs of the upper section of the elongated body and the logging subs of the lower section of the elongated body. 
     
     
         19 . The tool of  claim 17 , wherein the at least one logging sub of the lower section comprises a dipole sonic sensor. 
     
     
         20 . The tool of  claim 16 , wherein the retarder controls a speed of descent into a borehole.