Cooling wellbore logging tools

Abstract

An assembly and a method for cooling a downhole logging tool. The assembly includes a coiled tubing assembly having a downhole logging tool and a coiled tubing pipe. The coiled tubing pipe is coupled to the downhole logging tool. The coiled tubing pipe includes a cooling fluid tube. The cooling fluid tube conducts a cooling fluid to the downhole logging tool.

1 . A coiled tubing pipe, the coiled tubing pipe comprising:
 an outer pipe that defines an internal void;   a heat insulating material positioned in the internal void of the outer pipe; and   a cooling fluid tube embedded in the heat insulating material, the cooling fluid tube configured to conduct a cooling fluid to a downhole logging tool coupled to the coiled tubing pipe, the cooling fluid tube positioned in and extending through the heat insulating material in the internal void of the outer pipe, the heat insulating material configured to insulate the cooling fluid in the cooling fluid tube from heat in the wellbore, wherein the heat insulating material is fixed to and extends between an inner surface of the outer pipe and an outer surface of the cooling fluid tube.   
     
     
         2 . The coiled tubing pipe of  claim 1 , wherein the heat insulating material comprises at least one of a polystyrene or a polyurethane, and the heat insulating material completely fills the internal void of the outer pipe outside of the cooling fluid tube. 
     
     
         3 . The coiled tubing pipe of  claim 1 , wherein a central axis of the cooling fluid tube is parallel to a central axis of the coiled tubing pipe. 
     
     
         4 . The coiled tubing pipe of  claim 1 , wherein a flow of the cooling fluid through the cooling fluid tube past the downhole logging tool conducts heat from the downhole logging tool to the cooling fluid. 
     
     
         5 . The coiled tubing pipe of  claim 1 , wherein a flow of the cooling fluid through the cooling fluid tube past the downhole logging tool maintains a temperature of the downhole logging tool below a high temperature operating upper limit of the downhole logging tool. 
     
     
         6 . The coiled tubing pipe of  claim 1 , comprising a tool power and communication cable configured to transmit electrical power to the downhole logging tool, transmit control signals to the downhole logging tool, and transmit status signals from the downhole logging tool, the tool power and communication cable positioned in and extending through the internal void of the outer pipe. 
     
     
         7 . The coiled tubing pipe of  claim 1 , comprising a heat exchanged fluid tube positioned in and extending through the internal void of the outer pipe, the heat exchanged fluid tube coupled to a downhole end of the cooling fluid tube, the heat exchanged fluid tube configured to receive the cooling fluid from the cooling fluid tube and conduct the cooling fluid in an uphole direction through the coiled tubing pipe, the heat insulating material surrounding the cooling fluid tube and the heat exchanged fluid tube and positioning the cooling fluid tube and the heat exchanged fluid tube within the internal void relative to the outer pipe. 
     
     
         8 . The coiled tubing pipe of  claim 7 , wherein the heat exchanged fluid tube is configured to conduct the cooling fluid to a surface of the Earth in an uphole direction. 
     
     
         9 . The coiled tubing pipe of  claim 7 , wherein the heat exchanged fluid tube comprises at least one of a rubber or a polyether ether ketone. 
     
     
         10 . The coiled tubing pipe of  claim 7 , wherein the cooling fluid tube comprises at least one of a polyether ether ketone or a copper. 
     
     
         11 . The coiled tubing pipe of  claim 1 , wherein a central axis of the outer pipe and a central axis of the cooling fluid tube are co-linear. 
     
     
         12 . The coiled tubing pipe of  claim 1 , comprising a cooling fluid vent extending from a downhole end of the coiled tubing pipe to an outer shell of the downhole logging tool. 
     
     
         13 . The coiled tubing pipe of  claim 12 , wherein the cooling fluid vent is configured to conduct the cooling fluid from the downhole logging tool to a wellbore annulus. 
     
     
         14 . The coiled tubing pipe of  claim 1 , wherein the cooling fluid tube is configured to conduct the cooling fluid to past the downhole logging tool and exclusively out of the downhole logging tool into a wellbore annulus between the wellbore and the downhole logging tool. 
     
     
         15 . The coiled tubing pipe of  claim 1 , wherein the coiled tubing pipe comprises a first end configured to couple to a cooling fluid source and a second end configured to couple to the downhole logging tool, the cooling fluid source configured to supply the cooling fluid to the cooling fluid tube. 
     
     
         16 . The coiled tubing pipe of  claim 1 , wherein a flow of the cooling fluid to the downhole logging tool maintains a temperature of at least one of a sensor or an electrical circuit of the downhole logging tool below a high temperature operating upper limit. 
     
     
         17 . The coiled tubing pipe of  claim 16 , wherein the high temperature operating upper limit is 350° F. or higher. 
     
     
         18 . The coiled tubing pipe of  claim 16 , wherein a flow of the cooling fluid through the downhole logging tool maintains the temperature of the sensor or the electrical circuit below the high temperature operating upper limit. 
     
     
         19 . The coiled tubing pipe of  claim 1 , wherein a flow of the cooling fluid through the downhole logging tool conducts heat from the downhole logging tool to the cooling fluid. 
     
     
         20 . The coiled tubing pipe of  claim 1 , wherein the coiled tubing pipe further comprises a tool power and communication cable extending through the outer pipe, the tool power and communication cable configured to couple to a controller configured to perform operations comprising operating a coiled tubing reel about which the coiled tubing pipe is wrapped and the downhole logging tool.