Downhole Electrical System

Abstract

A cooling device for a drilling tool to be used in a wellbore, comprising an inner sleeve that forms a central void, an outer sleeve concentric with the inner sleeve and aligned along a same axis as the inner sleeve, creating a first annular space between the inner sleeve and the outer sleeve, and at least one thermoelectric cooler, comprising a hot-side and a cold side, positioned in the annular space, wherein the central void is at least partially filled with instrumentation, and the at least one thermoelectric cooler prevents the instrumentation from attaining a predetermined temperature set-point.

What is claimed is: 
     
         1 . A cooling device for a drilling tool to be used in a wellbore, comprising:
 an inner sleeve that forms a central void;   an outer sleeve concentric with the inner sleeve and aligned along a same axis as the inner sleeve, creating an annular space between the inner sleeve and the outer sleeve; and   at least one thermoelectric cooler, comprising a hot-side and a cold side, positioned in the annular space, wherein the central void is at least partially filled with instrumentation, and the at least one thermoelectric cooler prevents the instrumentation from attaining a predetermined temperature set-point.   
     
     
         2 . The cooling device of  claim 1 , wherein the hot-side is in direct contact with the outer sleeve and the cold-side is in direct contact with the inner sleeve. 
     
     
         3 . The cooling device of  claim 1 , further comprising an insulating material in the first annular space. 
     
     
         4 . The cooling device of  claim 3 , wherein the cold-side is in direct contact with the inner sleeve. 
     
     
         5 . A cooling device for an instrumentation system to be used in a wellbore, comprising:
 an inner sleeve that forms a central void that houses the instrumentation system;   an outer sleeve concentric with the inner sleeve and aligned along a same axis as the inner sleeve, creating a first annular space between the inner sleeve and the outer sleeve; and   at least one thermoelectric cooler positioned in the annular space, whereby the at least one thermoelectric cooler prevents the instrumentation from attaining a predetermined temperature set-point.   
     
     
         6 . A modular cooling device for a cylindrical drilling instrumentation system, comprising:
 an inner sleeve;   an outer sleeve concentric with the inner sleeve and aligned along a same axis as the inner sleeve, creating a first annular space between the inner sleeve and the outer sleeve; and   at least one thermoelectric cooler positioned in the annular space, wherein the inner sleeve fits around and is in direct contact with the drilling instrumentation system.   
     
     
         7 . A method of cooling electrical components located in a downhole drill string comprising locating a downhole drill string in a drill hole, wherein the drill string comprises an inner sleeve, an outer sleeve concentric with the inner sleeve and aligned along a same axis as the inner sleeve, creating a first annular space between the inner sleeve and the outer sleeve, and at least one thermoelectric cooler (TEC) positioned in the annular space 
     
     
         8 . The method of  claim 7 , wherein the electrical components are located in and are in direct contact with the inner sleeve. 
     
     
         9 . The method of  claim 7 , wherein the at least one TEC is supplied with energy to cool the electrical components located in the inner sleeve during a drilling process. 
     
     
         10 . The method of  claim 9 , wherein the drilling process is a directional drilling process. 
     
     
         11 . The method of  claim 7 , wherein the annular space between the inner sleeve and the outer sleeve comprises an insulating material. 
     
     
         12 . The method of  claim 11 , wherein the insulating material is selected from an expandable epoxy and a gas.