Methods and arrangements for carbon dioxide storage in subterranean geological formations

Abstract

The invention concerns an arrangement for injecting CO 2 in a supercritical state into a subterranean geological formation, said arrangement comprising: a conduit having a proximal portion and a distal portion, at least part of said distal portion extending in a substantially horizontal direction; multiple openings being provided in said distal portion of said conduit for injection of CO 2 into said geological formation; wherein said multiple openings are provided with outflow limiting means for limiting the flow rate of CO 2 through respective said opening into said geological formation. The invention also concerns a method for storage of CO 2 by said arrangement.

What is claimed is: 
     
         1 . An arrangement for injecting CO 2  in a supercritical state into a subterranean geological formation, said arrangement comprising:
 a conduit having a proximal portion and a distal portion, at least part of said distal portion extending in a substantially horizontal direction;   multiple openings being provided in said distal portion of said conduit for injection of CO 2  into said geological formation;   wherein said multiple openings are provided with outflow limiting means for limiting the flow rate of CO 2  through respective said opening into said geological formation.   
     
     
         2 . The arrangement of  claim 1 , wherein the distance between each two neighboring outflow limiting means is decreasing along the length of said conduit in the direction towards the distal end. 
     
     
         3 . The arrangement of  claim 1 , wherein said conduit is a branched conduit comprising a primary branch and at least one secondary branch. 
     
     
         4 . The arrangement of  claim 3 , wherein said at least one secondary branch branches off said primary branch in a point, said branch point being provided with branch-flow controlling means for limiting the flow of CO 2  into the respective secondary branch. 
     
     
         5 . The arrangement of  claim 1 , wherein said conduit is closed at its distal ends. 
     
     
         6 . The arrangement of  claim 1 , wherein a distal end portion of said conduit is open hole. 
     
     
         7 . The arrangement of  claim 1 , wherein said arrangement comprises pressure producing means for producing a pressure in said conduit sufficient for injection of CO 2  in a supercritical state into said geological formation. 
     
     
         8 . The arrangement of  claim 1 , wherein said outflow limiting means comprises at least one capillary fluidly connecting an inner lumen of said conduit with said geological formation. 
     
     
         9 . The arrangement of  claim 8 , wherein said capillary opens at its proximal end towards an inner lumen of said conduit, and opens at its distal end into the geological formation. 
     
     
         10 . The arrangement of  claim 1 , wherein said geological formation is an aquifer. 
     
     
         11 . A method for storage of CO 2  in a subterranean geological formation, said method comprising:
 introducing CO 2  into a conduit having a proximal portion and a distal portion, at least part of said distal portion extending in a substantially horizontal direction; and   injecting said CO 2  in a supercritical state through multiple openings into said geological formation,   wherein said multiple openings are provided in said distal portion of said conduit, and are each provided with flow limiting means for limiting the flow rate of CO 2  through each said multiple openings into said geological formation.   
     
     
         12 . The method of  claim 11 , wherein said CO 2  is injected through an arrangement for injecting CO 2  in a supercritical state into a subterranean geological formation, said arrangement comprising:
 a conduit having a proximal portion and a distal portion, at least part of said distal portion extending in a substantially horizontal direction;   multiple openings being provided in said distal portion of said conduit for injection of CO 2  into said geological formation.