Untethered And Autonomous Well Intervention Vehicle

Abstract

A system for automatic well intervention in a wellbore that includes a robotic tool assembly, and a plurality of subassemblies stored at or within the robotic tool assembly, where the robotic tool assembly is configured to assemble a downhole tool from the plurality of subassemblies, and where a subassembly, of the plurality of subassemblies, includes an energy storage subsystem configured to provide power to the downhole tool.

What is claimed is: 
     
         1 . A system for automatic well intervention in a wellbore, comprising:
 a robotic tool assembly; and   a plurality of subassemblies stored at or within the robotic tool assembly,   wherein the robotic tool assembly is configured to assemble a downhole tool from the plurality of subassemblies, and   wherein a subassembly, of the plurality of subassemblies, comprises an energy storage subsystem configured to provide power to the downhole tool.   
     
     
         2 . The system of  claim 1 , wherein the energy storage subsystem comprises a fuel cell. 
     
     
         3 . The system of  claim 2 , wherein the fuel cell is configured to operate using hydrogen and oxygen stored within the subassembly. 
     
     
         4 . The system of  claim 3 , wherein the hydrogen and the oxygen are stored in separate containers, absorbed to substrates, or stored in a chemical form. 
     
     
         5 . The system of  claim 3 , wherein the hydrogen and the oxygen are generated via electrolysis. 
     
     
         6 . The system of  claim 1 , wherein the energy storage subsystem comprises a turbine-based power generator configured to convert production flow energy of the wellbore into electrical energy. 
     
     
         7 . The system of  claim 1 , wherein the energy storage subsystem further comprises an ultra-capacitor. 
     
     
         8 . The system of  claim 1 , wherein the energy storage subsystem may be charged at a charging station. 
     
     
         9 . The system of  claim 8 , wherein the charging station uses contact charging to charge the energy storage subsystem. 
     
     
         10 . The system of  claim 8 , wherein the charging station uses non-contact charging to charge the energy storage subsystem. 
     
     
         11 . A method for automatic well intervention in a wellbore, comprising:
 assembling, with a robotic tool assembly, a downhole tool from a plurality of subassemblies, wherein a subassembly, of the plurality of subassemblies, comprises:
 an energy storage subsystem with a fuel cell or a turbine-based power generator; 
   introducing the downhole tool into the wellbore;   powering at least a portion of the downhole tool during operation using the energy storage subsystem; and   performing a wellbore operation with the downhole tool.   
     
     
         12 . The method of  claim 11 , wherein powering the downhole tool comprises utilizing the fuel cell within the energy storage subsystem. 
     
     
         13 . The method of  claim 12 , further comprising operating the fuel cell using stored hydrogen and oxygen. 
     
     
         14 . The method of  claim 13 , prior to or during assembling the downhole tool, the method further comprises:
 generating the hydrogen and the oxygen via electrolysis.   
     
     
         15 . The method of  claim 11 , wherein powering the downhole tool comprises utilizing the turbine-based power generator within the energy storage subsystem to convert production flow energy into electrical energy. 
     
     
         16 . The method of  claim 11 , further comprising retrieving the downhole tool from the wellbore and disassembling the downhole tool with the robotic tool assembly. 
     
     
         17 . A system for subsea well intervention, the system comprising:
 a plurality of subassemblies, wherein each subassembly is configured to perform a specific function related to a wellbore operation;   a plurality of storage locations disposed at a sea-floor, wherein each storage location is configured to hold a subassembly; and   a robotic tool assembly disposed at the sea-floor and operatively coupled to the plurality of storage locations,   wherein the robotic tool assembly is configured to:
 select a subset of subassemblies, of the plurality of subassemblies, from the plurality of storage locations based on a desired wellbore operation; and 
 assemble a downhole tool from the subset of subassemblies. 
   
     
     
         18 . The system of  claim 17 , wherein the robotic tool assembly is further configured to:
 retrieve the downhole tool from a wellbore after the desired wellbore operation is performed;   disassemble the downhole tool into the subset of subassemblies; and   return the subset of subassemblies to the plurality of storage locations after disassembly.   
     
     
         19 . The system of  claim 17 , wherein the desired wellbore operation is a logging operation, and wherein the downhole tool is tethered during the logging operation. 
     
     
         20 . The system of  claim 17 , wherein the robotic tool assembly further comprises:
 an assembly space configured to receive the subset of subassemblies for assembly of the downhole tool.