US2025198260A1PendingUtilityA1

Method for carbon dioxide injection into a subterranean reservoir

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Assignee: TOTALENERGIES ONETECHPriority: Mar 15, 2022Filed: Mar 15, 2022Published: Jun 19, 2025
Est. expiryMar 15, 2042(~15.6 yrs left)· nominal 20-yr term from priority
Inventors:Søren Mylius Davidsen
E21B 47/10E21B 47/06E21B 47/07E21B 43/164E21B 43/166E21B 41/0064
46
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Claims

Abstract

The present invention relates to a method for CO 2 storage, the method comprising injecting a CO 2 composition into a well of a subterranean reservoir, wherein the CO 2 composition is formed by combining a stream of vapor CO 2 and a stream of liquid CO 2 at a vapor CO 2 to liquid CO 2 ratio, wherein the vapor CO 2 to liquid CO 2 ratio varies over time. The invention also relates to an installation for CO 2 storage.

Claims

exact text as granted — not AI-modified
1 . A method for CO 2  storage, the method comprising injecting a CO 2  composition into a well of a subterranean reservoir, wherein the CO 2  composition is formed by combining a stream of vapor CO 2  and a stream of liquid CO 2  at a vapor CO 2  to liquid CO 2  ratio, wherein the vapor CO 2  to liquid CO 2  ratio varies over time. 
     
     
         2 . The method according  claim 1 , comprising a step of measuring a flow rate of the stream of liquid CO 2  or a flow rate of the stream of vapor CO 2  during injection into the subterranean reservoir and adjusting the vapor CO 2  to liquid CO 2  ratio as a result of this measurement. 
     
     
         3 . The method according to  claim 1 , comprising a step of initially injecting only a stream of vapor CO 2  into the well. 
     
     
         4 . The method according to  claim 1 , wherein the vapor CO 2  to liquid CO 2  ratio gradually decreases over time. 
     
     
         5 . The method according to  claim 1 , comprising a subsequent step of injecting only liquid CO 2  into the well. 
     
     
         6 . The method according to  claim 1 , wherein the pressure of the CO 2  composition during injection, at the inlet of the injection well, initially lies between 3 MPa and 7 MPa. 
     
     
         7 . The method according to  claim 1 , wherein the temperature of the CO 2  composition, at the inlet of the injection well, lies between 0° C. and 30° C. 
     
     
         8 . The method according to  claim 1 , wherein the subterranean reservoir is at an initial pressure between 2 MPa and 20 MPa. 
     
     
         9 . The method according to  claim 1 , wherein adjustments to the vapor CO 2  to liquid CO 2  ratio are made in real-time. 
     
     
         10 . The method according to  claim 1 , comprising a step of directly measuring the bottomhole pressure in the well and adjusting the vapor CO 2  to liquid CO 2  ratio as a result of this measurement. 
     
     
         11 . The method according to  claim 1 , comprising a step of measuring a topside temperature and adjusting the vapor CO 2  to liquid CO 2  ratio as a result of this measurement. 
     
     
         12 . The method according to  claim 1 , comprising a step of measuring a topside pressure in the well and adjusting the vapor CO 2  to liquid CO 2  ratio as a result of this measurement. 
     
     
         13 . The method according to  claim 1 , wherein the vapor CO 2  is obtained by evaporating liquid CO 2  by means of an evaporator. 
     
     
         14 . The method according to  claim 1 , wherein the well has a length that lies between 100 m and 5 km. 
     
     
         15 . The method according to  claim 1 , wherein the CO 2  composition comprises other compounds, including nitrogen and hydrocarbons in addition to CO 2 . 
     
     
         16 . The method according to  claim 1 , wherein the subterranean reservoir is onshore or offshore. 
     
     
         17 . An installation for CO 2  storage, the installation comprising:
 an injection well in a subterranean reservoir;   a liquid CO 2  injection line connected to an inlet of the injection well;   a vapor CO 2  injection line connected to an inlet of the injection well;   a flow meter and an adjustable valve positioned along either or both of the liquid CO 2  injection line and vapor CO 2  injection line;   a control unit configured to modify a ratio of vapor CO 2  to liquid CO 2  fed to the injection well.   
     
     
         18 . The installation according to  claim 17 , wherein at least one pressure sensor is positioned along the well or at at least one bottomhole location. 
     
     
         19 . The installation according to  claim 17 , wherein at least one temperature sensor is positioned along the well or at at least one bottomhole location. 
     
     
         20 . The installation according to  claim 17 , wherein an evaporator is positioned along the vapor CO 2  injection line, and configured to evaporate liquid CO 2  into vapor CO 2 . 
     
     
         21 . (canceled)

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