Damping vibration in coiled tubing

Abstract

A body defines a feedthrough passage. Bow springs surround and connect to an outer periphery of the body. The bow springs extend radially outward from the body. An internal coil spring is arranged to actuate axially within the body. A mandrel abuts an end of the coiled spring. The mandrel is arranged to move within the body, the mandrel having sufficient inertia to dampen vibrations.

What is claimed is: 
     
         1 . A coiled tubing vibration damper comprising:
 a body defining a feedthrough passage;   a plurality of bow springs surrounding and connected to an outer periphery of the body, the plurality of bow springs extending radially outward from the body;   an internal coil spring arranged to actuate axially within the body; and   a mandrel abutting an end of the coiled spring, the mandrel arranged to move within the body, the mandrel having sufficient inertia to dampen vibrations.   
     
     
         2 . The coiled tubing vibration damper of  claim 1 , wherein the body comprises corrugated metal tubing. 
     
     
         3 . The coiled tubing vibration damper of  claim 1 , wherein electrical cables extend through the feedthrough passage. 
     
     
         4 . The coiled tubing vibration damper of  claim 1 , wherein the feedthrough passage is fluidically isolated from an environment outside the body. 
     
     
         5 . The coiled tubing vibration damper of  claim 1 , wherein the plurality of bow springs comprise three bow springs. 
     
     
         6 . The coiled tubing vibration damper of  claim 1 , further comprising a plurality of sliding collars encircling the body, the plurality of sliding collars connected to each end of the plurality of bow springs, the sliding collars configured to axially move responsive to deflection of the plurality of bow spring. 
     
     
         7 . A method comprising:
 receiving axial and lateral vibrations by a coiled tubing vibration damper; and   damping the axial and lateral vibrations by the coiled tubing vibration damper, the coiled tubing vibration damper comprising mass-spring damping components.   
     
     
         8 . The method of  claim 7 , wherein damping the vibration by the coiled tubing vibration damper comprises damping axial vibrations by a mandrel and an internal coil spring within a body of the coiled tubing vibration damper. 
     
     
         9 . The method of  claim 7 , wherein damping the vibrations by the coiled tubing vibration damper comprises damping lateral vibrations by a plurality of bow springs. 
     
     
         10 . The method of  claim 9 , wherein the plurality of bow springs are in tension, the plurality of bow springs surround and connect to an outer periphery of a body of the coiled tubing vibration damper, the plurality of bow springs extend radially outward from the body. 
     
     
         11 . The method of  claim 9 , further comprising:
 collapsing the plurality of bow springs such that a radial extension of the bow springs is reduced; and   passing the coiled tube vibration damper through a slim section of a wellbore.   
     
     
         12 . The method of  claim 11 , further comprising:
 expanding the plurality of bow springs, such that the radial extension of the bow springs is increased, after passing through the slim section of the wellbore.   
     
     
         13 . The method of  claim 7 , wherein damping the vibrations comprises damping lateral vibrations by a corrugated metal body of the coiled tubing vibration damper. 
     
     
         14 . The method of  claim 7 , wherein damping the vibrations comprises damping axial vibrations by a corrugated metal body of the coiled tubing vibration damper. 
     
     
         15 . The method of  claim 7 , further comprising receiving vibration from a vibration sub by the coiled tubing vibration damper. 
     
     
         16 . A wellbore system comprising:
 a length of coiled tubing;   a vibration sub attached to the length of coiled tubing;   a logging tool attached to the length of coiled tubing; and   a vibration damper attached to the length of coiled tubing, the vibration damper being between the vibration sub and the logging tool, the vibration damper comprising:
 a body defining a feedthrough passage; 
 a plurality of bow springs surrounding and connected to an outer periphery of the body, the bow springs extending radially outward from the body; 
 an internal coil spring arranged to actuate actually within the body; and 
 a mandrel abutting an end of the coiled spring, the mandrel arranged to move within the body, the mandrel having sufficient inertia to dampen vibrations. 
   
     
     
         17 . The wellbore system of  claim 16 , wherein the body comprises corrugated metal tubing. 
     
     
         18 . The wellbore system of  claim 16 , wherein optical cables extend through the feedthrough passage. 
     
     
         19 . The wellbore system of  claim 16 , wherein the feedthrough passage is fluidically isolated from an outside environment. 
     
     
         20 . The wellbore system of  claim 16 , further comprising sliding collars coupled to the body, the sliding collars connected to each end of the plurality of bow spring, the sliding collars configured to axially move responsive to deflection of the plurality of bow spring.