Coiled tubing apllication having vibration-based feedback

Abstract

A method of performing a coiled tubing application using feedback includes conveying a coiled tubing string along a borehole and obtaining vibration measurement data based on vibrations within the coiled tubing string. The method further includes providing, during the coiled tubing application, feedback based on the vibration measurement data. The method further includes using a mechanical controller to adjust a variable element of the coiled tubing application based on the feedback.

What is claimed is: 
     
         1 . A method of performing a coiled tubing application using feedback comprising:
 conveying a coiled tubing string along a borehole;   obtaining vibration measurement data based on vibrations within the coiled tubing string;   providing, during the coiled tubing application, feedback based on the vibration measurement data; and   using a mechanical controller to adjust a variable element of the coiled tubing application based on the feedback.   
     
     
         2 . The method of  claim 1 , wherein the coiled tubing application comprises milling, the feedback comprises the vibration measurement data exceeding an amplitude or frequency threshold, and the variable element comprises force on the coiled tubing string. 
     
     
         3 . The method of  claim 1 , wherein the coiled tubing application comprises milling, the feedback comprises milling efficiency, and the variable element comprises force on the coiled tubing string, bit rotational speed, force on bit, bit type, or flow rate of fluid pumped through the coiled tubing. 
     
     
         4 . The method of  claim 1 , wherein the coiled tubing application comprises freeing a stuck tool, the feedback comprises an indication of movement in the tool, and the variable element comprises force on the coiled tubing string, flow rate of fluid pumped through the coiled tubing, or composition of the fluid pumped through the coiled tubing. 
     
     
         5 . The method of  claim 1 , wherein the coiled tubing application comprises clearing debris using a tool, the feedback comprises an indication of jetting performance of the tool, and the variable element comprises flow rate of fluid pumped through the coiled tubing or composition of the fluid pumped through the coiled tubing. 
     
     
         6 . The method of  claim 1 , wherein the coiled tubing application comprises perforation, the feedback comprises an indication that a perforation gun has not fired, and the variable element comprises flow rate of fluid being pumped through the coiled tubing or depth of a perforation tool in the borehole. 
     
     
         7 . The method of  claim 1 , wherein the coiled tubing application comprises formation fluid detection, the feedback comprises an indication of a formation fluid entering the borehole based on vibration measurement data from fluid passing through holes in well casing or production tubing. 
     
     
         8 . The method of  claim 1 , wherein the coiled tubing application comprises extended reaching and the variable element comprises force on the coiled tubing string or flow rate of fluid pumped through the coiled tubing. 
     
     
         9 . The method of  claim 1 , wherein obtaining vibration measurement data comprises obtaining vibration measurement data based on vibrations within a bottom-hole assembly of the coiled tubing string. 
     
     
         10 . The method of  claim 1 , wherein adjusting the variable element comprises adjusting the variable element of the coiled tubing application based on the feedback without human input. 
     
     
         11 . The method of  claim 1 , further comprising continuously providing, over a period of time, feedback based on changing vibration measurement data resulting from adjusting the variable element. 
     
     
         12 . The method of  claim 11 , further comprising continuously adjusting the variable element based on the feedback until the vibration measurement data conforms to a profile associated with the coiled tubing application. 
     
     
         13 . The method of  claim 12 , wherein the profile comprises at least one threshold of frequency, amplitude, or average energy associated with each sensor that measures vibrations within the coiled tubing string. 
     
     
         14 . A feedback system for a coiled tubing application comprising:
 coiled tubing string;   a vibration sensor coupled to the coiled tubing string, wherein the vibration sensor measures vibrations within the coiled tubing string; and   one or more processors, wherein the one or more processors:
 obtain vibration measurement data from the vibration sensor; and 
 provide feedback during the coiled tubing application based on the vibration measurement data; and 
   a mechanical controller, wherein the controller enables adjustment of a variable element of the coiled tubing application based on the feedback.   
     
     
         15 . The system of  claim 14 , wherein the coiled tubing string comprises a bottom-hole assembly, and wherein the processor adjusts the variable element based on a speed of the bottom-hole assembly as well as the feedback. 
     
     
         16 . The system of  claim 14 , wherein the vibration sensor comprises a tri-axial vibration sensor. 
     
     
         17 . The system of  claim 14 , wherein the vibration sensor comprises a piezoelectric accelerometer. 
     
     
         18 . The system of  claim 14 , wherein the coiled tubing string comprises a bottom-hole assembly, and wherein the processor obtains vibration measurement data based on vibrations within the bottom-hole assembly. 
     
     
         19 . The system of  claim 14 , wherein the one or more processors continuously provide, over a period of time, feedback based on changing vibration measurement data resulting from adjusting the variable element. 
     
     
         20 . The system of  claim 19 , wherein the controller continuously adjusts the variable element based on the feedback until the vibration measurement data conforms to a profile associated with the coiled tubing application.