Method and system for pipe conveyed logging

Abstract

Method and system for pipe conveyed logging (PCL) operations in which the drillpipe conveys a logging tool. The method and system coordinate operation of a wireline winch and drilling rig control systems to synchronize their operation, and/or the method and system attenuate the pull force applied to an upper end of the cable and transmit the attenuated force toward a lower end of the cable to reduce the risks of premature cable release and cable damage.

What is claimed is: 
     
         1 . A pipe conveyed logging (PCL) system, comprising:
 a logging tool conjugated with a lower end of a drillstring;   a cable side entry sub located above the logging tool;   a cable connected to the logging tool and passing inside the drillstring from the logging tool, through the cable side entry sub, and outside the drillstring above the cable side entry sub to a winch;   a weakpoint release formed in the cable at a point between the logging tool and the cable side entry sub to release the cable from the logging tool upon application of a predetermined release force to the cable at the weakpoint; and   an integrated control framework comprising a rig control system to translate the drillstring in a wellbore, a wireline winch control system to translate the cable in the wellbore, and a controller to automatically synchronize the translation of the drillstring and the cable in the wellbore.   
     
     
         2 . The PCL system of  claim 1 , wherein the integrated control system further comprises a databus in communication between the rig control system, the wireline winch control system, and the controller. 
     
     
         3 . The PCL system of  claim 2 , further comprising a gateway between the rig control system and the databus, a gateway between the wireline winch control system and the databus, or a combination thereof. 
     
     
         4 . The PCL system of  claim 2 , wherein the integrated control system comprises a human-machine interface in communication with the databus. 
     
     
         5 . A pipe conveyed logging (PCL) system, comprising:
 a logging tool conjugated with a lower end of a drillstring;   a cable side entry sub located above the logging tool;   a cable connected to the logging tool and passing inside the drillstring from the logging tool, through the cable side entry sub, and outside the drillstring above the cable side entry sub to a winch;   a cable clamping assembly securing the cable to the drillstring adjacent to the cable side entry sub and comprising a release set to activate at a predetermined pull force on the cable;   a drive to selectively wind and unwind the cable at least partially around the drillstring above the cable clamping assembly; and   a weakpoint formed in the cable between the logging tool and the cable side entry sub to release the cable from the logging tool upon application of a predetermined release force to the cable at the weakpoint.   
     
     
         6 . A pipe conveyed logging (PCL) method, comprising:
 (a) conjugating a logging tool to a lower end of a drillstring;   (b) passing a cable from a wireline winch through a cable side entry sub spaced above the logging tool;   (c) passing the cable inside the drillstring below the cable side entry sub;   (d) connecting the cable to the logging tool;   (e) passing the cable into the wellbore outside the drillstring above the cable side entry sub;   (f) forming a weakpoint release in the cable at a point between the logging tool and the cable side entry sub to release the cable from the logging tool upon application of a predetermined release force to the cable at the weakpoint;   (g) translating the drillstring in a wellbore with a rig control system in an integrated control framework;   (h) translating the cable in the wellbore with a wireline winch control system in the integrated control framework; and   (i) operating a controller in the integrated control framework to automatically synchronize translation of the drillstring and the cable in the wellbore.   
     
     
         7 . The PCL method of  claim 6 , further comprising communicating through a databus between the rig control system, the wireline winch control system, and the controller. 
     
     
         8 . The PCL method of  claim 7 , further comprising communicating between a human-machine interface and the databus.