Method for carbon dioxide sequestration
| DWPI Title: Method for injecting ultra-critical-carbon dioxide into underground geologic formation, involves utilizing travel distance to determine risk of supercritical carbon dioxide, and injecting supercritical carbon dioxide into geologic formation |
| Abstract: A method for geo-sequestration of a carbon dioxide includes selection of a target water-laden geological formation with low-permeability interbeds, providing an injection well into the formation and injecting supercritical carbon dioxide (SC—CO2) into the injection well under conditions of temperature, pressure and density selected to cause the fluid to enter the formation and splinter and/or form immobilized ganglia within the formation. This process allows for the immobilization of the injected SC—CO2 for very long times. The dispersal of scCO2 into small ganglia is accomplished by alternating injection of SC—CO2 and water. The injection rate is required to be high enough to ensure the SC—CO2 at the advancing front to be broken into pieces and small enough for immobilization through viscous instability. |
| Use: Method for injecting ultra-critical-carbon dioxide into an underground geologic formation. |
| Advantage: The method enables using a mechanism to relaxe need for stringent requirements for integrity of cap rocks for carbon dioxide (CO2) storage to enhance storage capacity and security. The method enables alternating injection of carbon dioxide with water to cut fingers horizontally, thus facilitating formation of isolated ganglia. |
| Novelty: The method involves determining supercritical carbon dioxide ganglion size for entrapment for given fluid velocity (1030). Maximum supercritical carbon dioxide ganglion formation is determined by induced viscous interface instability. Travel distance of supercritical carbon dioxide ganglion is determined within the geologic formation based on entrapment criteria. The determined travel distance is utilized to determine risk of supercritical carbon dioxide escaping from the geologic formation. The supercritical carbon dioxide is injected into the geologic formation. |
| Filed: 7/25/2013 |
| Application Number: US13951036A |
| Tech ID: SD 12079.1 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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