System for injecting water, collected from a subterranean aquifer, into an oil reservoir

Abstract

The invention relates to a system for collecting and injecting water from a subterranean aquifer directly into hydrocarbon reservoirs. The system may include a collecting wells in aquifers, injection wells in hydrocarbon producing reservoirs and a hydraulic connection for pumping water with access to a collecting zone and to an injection zone. The invention is applicable to hydrocarbons production fields, where water injection is used to maintain the pressure in a hydrocarbon producing reservoir, thereby enhancing the recovery rate of the same.

1 . A system for injecting water, collected from a subterranean aquifer, into a hydrocarbon reservoir, the system comprising:
 means for collecting water from a subterranean aquifer;   an injection pump that pumps the collected water into the hydrocarbon producing reservoir through at least one injection well; and   a direct hydraulic connection between a collecting zone of the subterranean aquifer and an injection zone of the hydrocarbon producing reservoir, the hydraulic connection comprising at least one submersible pipe.   
   
   
       2 . The system, according to  claim 1 , wherein the means for collecting water is a collecting well. 
   
   
       3 . The system, according to  claim 2 , wherein the well is a conventional well. 
   
   
       4 . The system according to  claim 2 , wherein the well is a multilateral well. 
   
   
       5 . The system according to  claim 3 , wherein the collecting zone and the injection zone are located in the same well with access to the collecting zone and to the injection zone. 
   
   
       6 . The system according to  claim 4 , wherein the collecting zone and the injection zone are located in the same well with access to the collecting zone and to the injection zone. 
   
   
       7 . The system according to  claim 3 , wherein the injection pump is installed outside the well. 
   
   
       8 . The system according to  claim 4 , wherein the injection pump is installed outside the well. 
   
   
       9 . The system according to  claim 3 , wherein the injection pump is installed inside the well. 
   
   
       10 . The system according to  claim 4 , wherein the injection pump is installed inside the well. 
   
   
       11 . The system according to  claim 1 , wherein the at least one injection well comprises a plurality of injection wells.